13deb3ec6SMatthias Ringwald /* 23deb3ec6SMatthias Ringwald * Copyright (C) 2014 BlueKitchen GmbH 33deb3ec6SMatthias Ringwald * 43deb3ec6SMatthias Ringwald * Redistribution and use in source and binary forms, with or without 53deb3ec6SMatthias Ringwald * modification, are permitted provided that the following conditions 63deb3ec6SMatthias Ringwald * are met: 73deb3ec6SMatthias Ringwald * 83deb3ec6SMatthias Ringwald * 1. Redistributions of source code must retain the above copyright 93deb3ec6SMatthias Ringwald * notice, this list of conditions and the following disclaimer. 103deb3ec6SMatthias Ringwald * 2. Redistributions in binary form must reproduce the above copyright 113deb3ec6SMatthias Ringwald * notice, this list of conditions and the following disclaimer in the 123deb3ec6SMatthias Ringwald * documentation and/or other materials provided with the distribution. 133deb3ec6SMatthias Ringwald * 3. Neither the name of the copyright holders nor the names of 143deb3ec6SMatthias Ringwald * contributors may be used to endorse or promote products derived 153deb3ec6SMatthias Ringwald * from this software without specific prior written permission. 163deb3ec6SMatthias Ringwald * 4. Any redistribution, use, or modification is done solely for 173deb3ec6SMatthias Ringwald * personal benefit and not for any commercial purpose or for 183deb3ec6SMatthias Ringwald * monetary gain. 193deb3ec6SMatthias Ringwald * 203deb3ec6SMatthias Ringwald * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 213deb3ec6SMatthias Ringwald * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 223deb3ec6SMatthias Ringwald * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 233deb3ec6SMatthias Ringwald * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 243deb3ec6SMatthias Ringwald * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 253deb3ec6SMatthias Ringwald * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 263deb3ec6SMatthias Ringwald * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 273deb3ec6SMatthias Ringwald * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 283deb3ec6SMatthias Ringwald * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 293deb3ec6SMatthias Ringwald * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 303deb3ec6SMatthias Ringwald * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 313deb3ec6SMatthias Ringwald * SUCH DAMAGE. 323deb3ec6SMatthias Ringwald * 333deb3ec6SMatthias Ringwald * Please inquire about commercial licensing options at 343deb3ec6SMatthias Ringwald * [email protected] 353deb3ec6SMatthias Ringwald * 363deb3ec6SMatthias Ringwald */ 37ab2c6ae4SMatthias Ringwald 38ab2c6ae4SMatthias Ringwald #define __BTSTACK_FILE__ "sm.c" 393deb3ec6SMatthias Ringwald 403deb3ec6SMatthias Ringwald #include <stdio.h> 413deb3ec6SMatthias Ringwald #include <string.h> 423deb3ec6SMatthias Ringwald #include <inttypes.h> 433deb3ec6SMatthias Ringwald 443edc84c5SMatthias Ringwald #include "ble/le_device_db.h" 4559c6af15SMatthias Ringwald #include "ble/core.h" 463edc84c5SMatthias Ringwald #include "ble/sm.h" 4761f37892SMatthias Ringwald #include "bluetooth_company_id.h" 480e2df43fSMatthias Ringwald #include "btstack_debug.h" 490e2df43fSMatthias Ringwald #include "btstack_event.h" 500e2df43fSMatthias Ringwald #include "btstack_linked_list.h" 510e2df43fSMatthias Ringwald #include "btstack_memory.h" 52f7a05cdaSMatthias Ringwald #include "gap.h" 530e2df43fSMatthias Ringwald #include "hci.h" 5413377825SMatthias Ringwald #include "hci_dump.h" 550e2df43fSMatthias Ringwald #include "l2cap.h" 563deb3ec6SMatthias Ringwald 571a682202SMatthias Ringwald #if !defined(ENABLE_LE_PERIPHERAL) && !defined(ENABLE_LE_CENTRAL) 581a682202SMatthias Ringwald #error "LE Security Manager used, but neither ENABLE_LE_PERIPHERAL nor ENABLE_LE_CENTRAL defined. Please add at least one to btstack_config.h." 591a682202SMatthias Ringwald #endif 601a682202SMatthias Ringwald 6142134bc6SMatthias Ringwald #if defined(ENABLE_LE_PERIPHERAL) && defined(ENABLE_LE_CENTRAL) 6242134bc6SMatthias Ringwald #define IS_RESPONDER(role) (role) 6342134bc6SMatthias Ringwald #else 6442134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 6542134bc6SMatthias Ringwald // only central - never responder (avoid 'unused variable' warnings) 6642134bc6SMatthias Ringwald #define IS_RESPONDER(role) (0 && role) 6742134bc6SMatthias Ringwald #else 6842134bc6SMatthias Ringwald // only peripheral - always responder (avoid 'unused variable' warnings) 6942134bc6SMatthias Ringwald #define IS_RESPONDER(role) (1 || role) 7042134bc6SMatthias Ringwald #endif 7142134bc6SMatthias Ringwald #endif 7242134bc6SMatthias Ringwald 73e53be891SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 7435ef8655SMatthias Ringwald // assert SM Public Key can be sent/received 7535ef8655SMatthias Ringwald #if HCI_ACL_PAYLOAD_SIZE < 69 7635ef8655SMatthias Ringwald #error "HCI_ACL_PAYLOAD_SIZE must be at least 69 bytes when using LE Secure Conection. Please increase HCI_ACL_PAYLOAD_SIZE or disable ENABLE_LE_SECURE_CONNECTIONS" 7735ef8655SMatthias Ringwald #endif 7835ef8655SMatthias Ringwald 797df18c15SMatthias Ringwald #ifdef HAVE_HCI_CONTROLLER_DHKEY_SUPPORT 807df18c15SMatthias Ringwald #error "Support for DHKEY Support in HCI Controller not implemented yet. Please use software implementation" 817df18c15SMatthias Ringwald #else 82c692d776SMatthias Ringwald #define USE_MICROECC_FOR_ECDH 837df18c15SMatthias Ringwald #endif 847df18c15SMatthias Ringwald #endif 857df18c15SMatthias Ringwald 86c692d776SMatthias Ringwald // Software ECDH implementation provided by micro-ecc 87c692d776SMatthias Ringwald #ifdef USE_MICROECC_FOR_ECDH 88c692d776SMatthias Ringwald #include "uECC.h" 89c692d776SMatthias Ringwald #endif 90c692d776SMatthias Ringwald 917a766ebfSMatthias Ringwald #if defined(ENABLE_LE_SIGNED_WRITE) || defined(ENABLE_LE_SECURE_CONNECTIONS) 927a766ebfSMatthias Ringwald #define ENABLE_CMAC_ENGINE 937a766ebfSMatthias Ringwald #endif 947a766ebfSMatthias Ringwald 953deb3ec6SMatthias Ringwald // 963deb3ec6SMatthias Ringwald // SM internal types and globals 973deb3ec6SMatthias Ringwald // 983deb3ec6SMatthias Ringwald 993deb3ec6SMatthias Ringwald typedef enum { 1003deb3ec6SMatthias Ringwald DKG_W4_WORKING, 1013deb3ec6SMatthias Ringwald DKG_CALC_IRK, 1023deb3ec6SMatthias Ringwald DKG_W4_IRK, 1033deb3ec6SMatthias Ringwald DKG_CALC_DHK, 1043deb3ec6SMatthias Ringwald DKG_W4_DHK, 1053deb3ec6SMatthias Ringwald DKG_READY 1063deb3ec6SMatthias Ringwald } derived_key_generation_t; 1073deb3ec6SMatthias Ringwald 1083deb3ec6SMatthias Ringwald typedef enum { 1093deb3ec6SMatthias Ringwald RAU_W4_WORKING, 1103deb3ec6SMatthias Ringwald RAU_IDLE, 1113deb3ec6SMatthias Ringwald RAU_GET_RANDOM, 1123deb3ec6SMatthias Ringwald RAU_W4_RANDOM, 1133deb3ec6SMatthias Ringwald RAU_GET_ENC, 1143deb3ec6SMatthias Ringwald RAU_W4_ENC, 1153deb3ec6SMatthias Ringwald RAU_SET_ADDRESS, 1163deb3ec6SMatthias Ringwald } random_address_update_t; 1173deb3ec6SMatthias Ringwald 1183deb3ec6SMatthias Ringwald typedef enum { 1193deb3ec6SMatthias Ringwald CMAC_IDLE, 1203deb3ec6SMatthias Ringwald CMAC_CALC_SUBKEYS, 1213deb3ec6SMatthias Ringwald CMAC_W4_SUBKEYS, 1223deb3ec6SMatthias Ringwald CMAC_CALC_MI, 1233deb3ec6SMatthias Ringwald CMAC_W4_MI, 1243deb3ec6SMatthias Ringwald CMAC_CALC_MLAST, 1253deb3ec6SMatthias Ringwald CMAC_W4_MLAST 1263deb3ec6SMatthias Ringwald } cmac_state_t; 1273deb3ec6SMatthias Ringwald 1283deb3ec6SMatthias Ringwald typedef enum { 1293deb3ec6SMatthias Ringwald JUST_WORKS, 13027c32905SMatthias Ringwald PK_RESP_INPUT, // Initiator displays PK, responder inputs PK 13127c32905SMatthias Ringwald PK_INIT_INPUT, // Responder displays PK, initiator inputs PK 1323deb3ec6SMatthias Ringwald OK_BOTH_INPUT, // Only input on both, both input PK 13327c32905SMatthias Ringwald NK_BOTH_INPUT, // Only numerical compparison (yes/no) on on both sides 1343deb3ec6SMatthias Ringwald OOB // OOB available on both sides 1353deb3ec6SMatthias Ringwald } stk_generation_method_t; 1363deb3ec6SMatthias Ringwald 1373deb3ec6SMatthias Ringwald typedef enum { 1383deb3ec6SMatthias Ringwald SM_USER_RESPONSE_IDLE, 1393deb3ec6SMatthias Ringwald SM_USER_RESPONSE_PENDING, 1403deb3ec6SMatthias Ringwald SM_USER_RESPONSE_CONFIRM, 1413deb3ec6SMatthias Ringwald SM_USER_RESPONSE_PASSKEY, 1423deb3ec6SMatthias Ringwald SM_USER_RESPONSE_DECLINE 1433deb3ec6SMatthias Ringwald } sm_user_response_t; 1443deb3ec6SMatthias Ringwald 1453deb3ec6SMatthias Ringwald typedef enum { 1463deb3ec6SMatthias Ringwald SM_AES128_IDLE, 1473deb3ec6SMatthias Ringwald SM_AES128_ACTIVE 1483deb3ec6SMatthias Ringwald } sm_aes128_state_t; 1493deb3ec6SMatthias Ringwald 1503deb3ec6SMatthias Ringwald typedef enum { 1513deb3ec6SMatthias Ringwald ADDRESS_RESOLUTION_IDLE, 1523deb3ec6SMatthias Ringwald ADDRESS_RESOLUTION_GENERAL, 1533deb3ec6SMatthias Ringwald ADDRESS_RESOLUTION_FOR_CONNECTION, 1543deb3ec6SMatthias Ringwald } address_resolution_mode_t; 1553deb3ec6SMatthias Ringwald 1563deb3ec6SMatthias Ringwald typedef enum { 1573deb3ec6SMatthias Ringwald ADDRESS_RESOLUTION_SUCEEDED, 1583deb3ec6SMatthias Ringwald ADDRESS_RESOLUTION_FAILED, 1593deb3ec6SMatthias Ringwald } address_resolution_event_t; 160901c000fSMatthias Ringwald 161901c000fSMatthias Ringwald typedef enum { 1627df18c15SMatthias Ringwald EC_KEY_GENERATION_IDLE, 1637df18c15SMatthias Ringwald EC_KEY_GENERATION_ACTIVE, 16409e4d397SMatthias Ringwald EC_KEY_GENERATION_W4_KEY, 1657df18c15SMatthias Ringwald EC_KEY_GENERATION_DONE, 1667df18c15SMatthias Ringwald } ec_key_generation_state_t; 1677df18c15SMatthias Ringwald 1687df18c15SMatthias Ringwald typedef enum { 169901c000fSMatthias Ringwald SM_STATE_VAR_DHKEY_COMMAND_RECEIVED = 1 << 0 170901c000fSMatthias Ringwald } sm_state_var_t; 171901c000fSMatthias Ringwald 1723deb3ec6SMatthias Ringwald // 1733deb3ec6SMatthias Ringwald // GLOBAL DATA 1743deb3ec6SMatthias Ringwald // 1753deb3ec6SMatthias Ringwald 1763deb3ec6SMatthias Ringwald static uint8_t test_use_fixed_local_csrk; 1773deb3ec6SMatthias Ringwald 1783deb3ec6SMatthias Ringwald // configuration 1793deb3ec6SMatthias Ringwald static uint8_t sm_accepted_stk_generation_methods; 1803deb3ec6SMatthias Ringwald static uint8_t sm_max_encryption_key_size; 1813deb3ec6SMatthias Ringwald static uint8_t sm_min_encryption_key_size; 1823deb3ec6SMatthias Ringwald static uint8_t sm_auth_req = 0; 1833deb3ec6SMatthias Ringwald static uint8_t sm_io_capabilities = IO_CAPABILITY_NO_INPUT_NO_OUTPUT; 1843deb3ec6SMatthias Ringwald static uint8_t sm_slave_request_security; 18531c09488SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 186df86eb96SMatthias Ringwald static uint8_t sm_have_ec_keypair; 18731c09488SMatthias Ringwald #endif 1883deb3ec6SMatthias Ringwald 1893deb3ec6SMatthias Ringwald // Security Manager Master Keys, please use sm_set_er(er) and sm_set_ir(ir) with your own 128 bit random values 1903deb3ec6SMatthias Ringwald static sm_key_t sm_persistent_er; 1913deb3ec6SMatthias Ringwald static sm_key_t sm_persistent_ir; 1923deb3ec6SMatthias Ringwald 1933deb3ec6SMatthias Ringwald // derived from sm_persistent_ir 1943deb3ec6SMatthias Ringwald static sm_key_t sm_persistent_dhk; 1953deb3ec6SMatthias Ringwald static sm_key_t sm_persistent_irk; 1963deb3ec6SMatthias Ringwald static uint8_t sm_persistent_irk_ready = 0; // used for testing 1973deb3ec6SMatthias Ringwald static derived_key_generation_t dkg_state; 1983deb3ec6SMatthias Ringwald 1993deb3ec6SMatthias Ringwald // derived from sm_persistent_er 2003deb3ec6SMatthias Ringwald // .. 2013deb3ec6SMatthias Ringwald 2023deb3ec6SMatthias Ringwald // random address update 2033deb3ec6SMatthias Ringwald static random_address_update_t rau_state; 2043deb3ec6SMatthias Ringwald static bd_addr_t sm_random_address; 2053deb3ec6SMatthias Ringwald 206514d35fcSMatthias Ringwald // CMAC Calculation: General 2077a766ebfSMatthias Ringwald #ifdef ENABLE_CMAC_ENGINE 2083deb3ec6SMatthias Ringwald static cmac_state_t sm_cmac_state; 2093deb3ec6SMatthias Ringwald static uint16_t sm_cmac_message_len; 210514d35fcSMatthias Ringwald static sm_key_t sm_cmac_k; 2113deb3ec6SMatthias Ringwald static sm_key_t sm_cmac_x; 212514d35fcSMatthias Ringwald static sm_key_t sm_cmac_m_last; 2133deb3ec6SMatthias Ringwald static uint8_t sm_cmac_block_current; 2143deb3ec6SMatthias Ringwald static uint8_t sm_cmac_block_count; 215514d35fcSMatthias Ringwald static uint8_t (*sm_cmac_get_byte)(uint16_t offset); 216514d35fcSMatthias Ringwald static void (*sm_cmac_done_handler)(uint8_t * hash); 2177a766ebfSMatthias Ringwald #endif 218514d35fcSMatthias Ringwald 219514d35fcSMatthias Ringwald // CMAC for ATT Signed Writes 2207a766ebfSMatthias Ringwald #ifdef ENABLE_LE_SIGNED_WRITE 221514d35fcSMatthias Ringwald static uint8_t sm_cmac_header[3]; 222aec94140SMatthias Ringwald static const uint8_t * sm_cmac_message; 223514d35fcSMatthias Ringwald static uint8_t sm_cmac_sign_counter[4]; 2247a766ebfSMatthias Ringwald #endif 225514d35fcSMatthias Ringwald 226514d35fcSMatthias Ringwald // CMAC for Secure Connection functions 227514d35fcSMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 228aec94140SMatthias Ringwald static sm_connection_t * sm_cmac_connection; 229514d35fcSMatthias Ringwald static uint8_t sm_cmac_sc_buffer[80]; 230514d35fcSMatthias Ringwald #endif 2313deb3ec6SMatthias Ringwald 2323deb3ec6SMatthias Ringwald // resolvable private address lookup / CSRK calculation 2333deb3ec6SMatthias Ringwald static int sm_address_resolution_test; 2343deb3ec6SMatthias Ringwald static int sm_address_resolution_ah_calculation_active; 2353deb3ec6SMatthias Ringwald static uint8_t sm_address_resolution_addr_type; 2363deb3ec6SMatthias Ringwald static bd_addr_t sm_address_resolution_address; 2373deb3ec6SMatthias Ringwald static void * sm_address_resolution_context; 2383deb3ec6SMatthias Ringwald static address_resolution_mode_t sm_address_resolution_mode; 2398f2a52f4SMatthias Ringwald static btstack_linked_list_t sm_address_resolution_general_queue; 2403deb3ec6SMatthias Ringwald 2413deb3ec6SMatthias Ringwald // aes128 crypto engine. store current sm_connection_t in sm_aes128_context 2423deb3ec6SMatthias Ringwald static sm_aes128_state_t sm_aes128_state; 2433deb3ec6SMatthias Ringwald static void * sm_aes128_context; 2443deb3ec6SMatthias Ringwald 2457df1ef2fSMatthias Ringwald // use aes128 provided by MCU - not needed usually 2467df1ef2fSMatthias Ringwald #ifdef HAVE_AES128 2477df1ef2fSMatthias Ringwald static uint8_t aes128_result_flipped[16]; 2487df1ef2fSMatthias Ringwald static btstack_timer_source_t aes128_timer; 2498e24486aSMatthias Ringwald void btstack_aes128_calc(uint8_t * key, uint8_t * plaintext, uint8_t * result); 2507df1ef2fSMatthias Ringwald #endif 2517df1ef2fSMatthias Ringwald 2523deb3ec6SMatthias Ringwald // random engine. store context (ususally sm_connection_t) 2533deb3ec6SMatthias Ringwald static void * sm_random_context; 2543deb3ec6SMatthias Ringwald 255e03e489aSMatthias Ringwald // to receive hci events 256e03e489aSMatthias Ringwald static btstack_packet_callback_registration_t hci_event_callback_registration; 257e03e489aSMatthias Ringwald 25889a78d34SMatthias Ringwald /* to dispatch sm event */ 25989a78d34SMatthias Ringwald static btstack_linked_list_t sm_event_handlers; 26089a78d34SMatthias Ringwald 26109e4d397SMatthias Ringwald // LE Secure Connections 26209e4d397SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 26309e4d397SMatthias Ringwald static ec_key_generation_state_t ec_key_generation_state; 26409e4d397SMatthias Ringwald static uint8_t ec_d[32]; 265fc5bff5fSMatthias Ringwald static uint8_t ec_q[64]; 26609e4d397SMatthias Ringwald #endif 267df86eb96SMatthias Ringwald 2683deb3ec6SMatthias Ringwald // 2693deb3ec6SMatthias Ringwald // Volume 3, Part H, Chapter 24 2703deb3ec6SMatthias Ringwald // "Security shall be initiated by the Security Manager in the device in the master role. 2713deb3ec6SMatthias Ringwald // The device in the slave role shall be the responding device." 2723deb3ec6SMatthias Ringwald // -> master := initiator, slave := responder 2733deb3ec6SMatthias Ringwald // 2743deb3ec6SMatthias Ringwald 2753deb3ec6SMatthias Ringwald // data needed for security setup 2763deb3ec6SMatthias Ringwald typedef struct sm_setup_context { 2773deb3ec6SMatthias Ringwald 278ec820d77SMatthias Ringwald btstack_timer_source_t sm_timeout; 2793deb3ec6SMatthias Ringwald 2803deb3ec6SMatthias Ringwald // used in all phases 2813deb3ec6SMatthias Ringwald uint8_t sm_pairing_failed_reason; 2823deb3ec6SMatthias Ringwald 2833deb3ec6SMatthias Ringwald // user response, (Phase 1 and/or 2) 2843deb3ec6SMatthias Ringwald uint8_t sm_user_response; 2853d7fe1e9SMatthias Ringwald uint8_t sm_keypress_notification; 2863deb3ec6SMatthias Ringwald 2873deb3ec6SMatthias Ringwald // defines which keys will be send after connection is encrypted - calculated during Phase 1, used Phase 3 2883deb3ec6SMatthias Ringwald int sm_key_distribution_send_set; 2893deb3ec6SMatthias Ringwald int sm_key_distribution_received_set; 2903deb3ec6SMatthias Ringwald 2913deb3ec6SMatthias Ringwald // Phase 2 (Pairing over SMP) 2923deb3ec6SMatthias Ringwald stk_generation_method_t sm_stk_generation_method; 2933deb3ec6SMatthias Ringwald sm_key_t sm_tk; 29427c32905SMatthias Ringwald uint8_t sm_use_secure_connections; 2953deb3ec6SMatthias Ringwald 2963deb3ec6SMatthias Ringwald sm_key_t sm_c1_t3_value; // c1 calculation 2973deb3ec6SMatthias Ringwald sm_pairing_packet_t sm_m_preq; // pairing request - needed only for c1 2983deb3ec6SMatthias Ringwald sm_pairing_packet_t sm_s_pres; // pairing response - needed only for c1 2993deb3ec6SMatthias Ringwald sm_key_t sm_local_random; 3003deb3ec6SMatthias Ringwald sm_key_t sm_local_confirm; 3013deb3ec6SMatthias Ringwald sm_key_t sm_peer_random; 3023deb3ec6SMatthias Ringwald sm_key_t sm_peer_confirm; 3033deb3ec6SMatthias Ringwald uint8_t sm_m_addr_type; // address and type can be removed 3043deb3ec6SMatthias Ringwald uint8_t sm_s_addr_type; // '' 3053deb3ec6SMatthias Ringwald bd_addr_t sm_m_address; // '' 3063deb3ec6SMatthias Ringwald bd_addr_t sm_s_address; // '' 3073deb3ec6SMatthias Ringwald sm_key_t sm_ltk; 3083deb3ec6SMatthias Ringwald 30968437d83SMatthias Ringwald uint8_t sm_state_vars; 310e53be891SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 311fc5bff5fSMatthias Ringwald uint8_t sm_peer_q[64]; // also stores random for EC key generation during init 312446a8c36SMatthias Ringwald sm_key_t sm_peer_nonce; // might be combined with sm_peer_random 313446a8c36SMatthias Ringwald sm_key_t sm_local_nonce; // might be combined with sm_local_random 314e53be891SMatthias Ringwald sm_key_t sm_peer_dhkey_check; 315e53be891SMatthias Ringwald sm_key_t sm_local_dhkey_check; 316446a8c36SMatthias Ringwald sm_key_t sm_ra; 317446a8c36SMatthias Ringwald sm_key_t sm_rb; 3182bacf595SMatthias Ringwald sm_key_t sm_t; // used for f5 and h6 319a9f29768SMatthias Ringwald sm_key_t sm_mackey; 3207df18c15SMatthias Ringwald uint8_t sm_passkey_bit; // also stores number of generated random bytes for EC key generation 321e53be891SMatthias Ringwald #endif 32227c32905SMatthias Ringwald 3233deb3ec6SMatthias Ringwald // Phase 3 3243deb3ec6SMatthias Ringwald 3253deb3ec6SMatthias Ringwald // key distribution, we generate 3263deb3ec6SMatthias Ringwald uint16_t sm_local_y; 3273deb3ec6SMatthias Ringwald uint16_t sm_local_div; 3283deb3ec6SMatthias Ringwald uint16_t sm_local_ediv; 3293deb3ec6SMatthias Ringwald uint8_t sm_local_rand[8]; 3303deb3ec6SMatthias Ringwald sm_key_t sm_local_ltk; 3313deb3ec6SMatthias Ringwald sm_key_t sm_local_csrk; 3323deb3ec6SMatthias Ringwald sm_key_t sm_local_irk; 3333deb3ec6SMatthias Ringwald // sm_local_address/addr_type not needed 3343deb3ec6SMatthias Ringwald 3353deb3ec6SMatthias Ringwald // key distribution, received from peer 3363deb3ec6SMatthias Ringwald uint16_t sm_peer_y; 3373deb3ec6SMatthias Ringwald uint16_t sm_peer_div; 3383deb3ec6SMatthias Ringwald uint16_t sm_peer_ediv; 3393deb3ec6SMatthias Ringwald uint8_t sm_peer_rand[8]; 3403deb3ec6SMatthias Ringwald sm_key_t sm_peer_ltk; 3413deb3ec6SMatthias Ringwald sm_key_t sm_peer_irk; 3423deb3ec6SMatthias Ringwald sm_key_t sm_peer_csrk; 3433deb3ec6SMatthias Ringwald uint8_t sm_peer_addr_type; 3443deb3ec6SMatthias Ringwald bd_addr_t sm_peer_address; 3453deb3ec6SMatthias Ringwald 3463deb3ec6SMatthias Ringwald } sm_setup_context_t; 3473deb3ec6SMatthias Ringwald 3483deb3ec6SMatthias Ringwald // 3493deb3ec6SMatthias Ringwald static sm_setup_context_t the_setup; 3503deb3ec6SMatthias Ringwald static sm_setup_context_t * setup = &the_setup; 3513deb3ec6SMatthias Ringwald 3523deb3ec6SMatthias Ringwald // active connection - the one for which the_setup is used for 3537149bde5SMatthias Ringwald static uint16_t sm_active_connection_handle = HCI_CON_HANDLE_INVALID; 3543deb3ec6SMatthias Ringwald 3553deb3ec6SMatthias Ringwald // @returns 1 if oob data is available 3563deb3ec6SMatthias Ringwald // stores oob data in provided 16 byte buffer if not null 3573deb3ec6SMatthias Ringwald static int (*sm_get_oob_data)(uint8_t addres_type, bd_addr_t addr, uint8_t * oob_data) = NULL; 3583deb3ec6SMatthias Ringwald 3593deb3ec6SMatthias Ringwald // horizontal: initiator capabilities 3603deb3ec6SMatthias Ringwald // vertial: responder capabilities 3613deb3ec6SMatthias Ringwald static const stk_generation_method_t stk_generation_method [5] [5] = { 3623deb3ec6SMatthias Ringwald { JUST_WORKS, JUST_WORKS, PK_INIT_INPUT, JUST_WORKS, PK_INIT_INPUT }, 3633deb3ec6SMatthias Ringwald { JUST_WORKS, JUST_WORKS, PK_INIT_INPUT, JUST_WORKS, PK_INIT_INPUT }, 3643deb3ec6SMatthias Ringwald { PK_RESP_INPUT, PK_RESP_INPUT, OK_BOTH_INPUT, JUST_WORKS, PK_RESP_INPUT }, 3653deb3ec6SMatthias Ringwald { JUST_WORKS, JUST_WORKS, JUST_WORKS, JUST_WORKS, JUST_WORKS }, 3663deb3ec6SMatthias Ringwald { PK_RESP_INPUT, PK_RESP_INPUT, PK_INIT_INPUT, JUST_WORKS, PK_RESP_INPUT }, 3673deb3ec6SMatthias Ringwald }; 3683deb3ec6SMatthias Ringwald 36927c32905SMatthias Ringwald // uses numeric comparison if one side has DisplayYesNo and KeyboardDisplay combinations 37027c32905SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 37127c32905SMatthias Ringwald static const stk_generation_method_t stk_generation_method_with_secure_connection[5][5] = { 37227c32905SMatthias Ringwald { JUST_WORKS, JUST_WORKS, PK_INIT_INPUT, JUST_WORKS, PK_INIT_INPUT }, 37327c32905SMatthias Ringwald { JUST_WORKS, NK_BOTH_INPUT, PK_INIT_INPUT, JUST_WORKS, NK_BOTH_INPUT }, 37427c32905SMatthias Ringwald { PK_RESP_INPUT, PK_RESP_INPUT, OK_BOTH_INPUT, JUST_WORKS, PK_RESP_INPUT }, 37527c32905SMatthias Ringwald { JUST_WORKS, JUST_WORKS, JUST_WORKS, JUST_WORKS, JUST_WORKS }, 37627c32905SMatthias Ringwald { PK_RESP_INPUT, NK_BOTH_INPUT, PK_INIT_INPUT, JUST_WORKS, NK_BOTH_INPUT }, 37727c32905SMatthias Ringwald }; 37827c32905SMatthias Ringwald #endif 37927c32905SMatthias Ringwald 3803deb3ec6SMatthias Ringwald static void sm_run(void); 381711e6c80SMatthias Ringwald static void sm_done_for_handle(hci_con_handle_t con_handle); 382711e6c80SMatthias Ringwald static sm_connection_t * sm_get_connection_for_handle(hci_con_handle_t con_handle); 3833deb3ec6SMatthias Ringwald static inline int sm_calc_actual_encryption_key_size(int other); 3843deb3ec6SMatthias Ringwald static int sm_validate_stk_generation_method(void); 3857df1ef2fSMatthias Ringwald static void sm_handle_encryption_result(uint8_t * data); 3863deb3ec6SMatthias Ringwald 3873deb3ec6SMatthias Ringwald static void log_info_hex16(const char * name, uint16_t value){ 3883deb3ec6SMatthias Ringwald log_info("%-6s 0x%04x", name, value); 3893deb3ec6SMatthias Ringwald } 3903deb3ec6SMatthias Ringwald 3913deb3ec6SMatthias Ringwald // @returns 1 if all bytes are 0 3923764b551SMatthias Ringwald static int sm_is_null(uint8_t * data, int size){ 3933deb3ec6SMatthias Ringwald int i; 3943764b551SMatthias Ringwald for (i=0; i < size ; i++){ 3953764b551SMatthias Ringwald if (data[i]) return 0; 3963deb3ec6SMatthias Ringwald } 3973deb3ec6SMatthias Ringwald return 1; 3983deb3ec6SMatthias Ringwald } 3993deb3ec6SMatthias Ringwald 4003764b551SMatthias Ringwald static int sm_is_null_random(uint8_t random[8]){ 4013764b551SMatthias Ringwald return sm_is_null(random, 8); 4023764b551SMatthias Ringwald } 4033764b551SMatthias Ringwald 4043764b551SMatthias Ringwald static int sm_is_null_key(uint8_t * key){ 4053764b551SMatthias Ringwald return sm_is_null(key, 16); 4063764b551SMatthias Ringwald } 4073764b551SMatthias Ringwald 4083deb3ec6SMatthias Ringwald // Key utils 4093deb3ec6SMatthias Ringwald static void sm_reset_tk(void){ 4103deb3ec6SMatthias Ringwald int i; 4113deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 4123deb3ec6SMatthias Ringwald setup->sm_tk[i] = 0; 4133deb3ec6SMatthias Ringwald } 4143deb3ec6SMatthias Ringwald } 4153deb3ec6SMatthias Ringwald 4163deb3ec6SMatthias Ringwald // "For example, if a 128-bit encryption key is 0x123456789ABCDEF0123456789ABCDEF0 4173deb3ec6SMatthias Ringwald // and it is reduced to 7 octets (56 bits), then the resulting key is 0x0000000000000000003456789ABCDEF0."" 4183deb3ec6SMatthias Ringwald static void sm_truncate_key(sm_key_t key, int max_encryption_size){ 4193deb3ec6SMatthias Ringwald int i; 4203deb3ec6SMatthias Ringwald for (i = max_encryption_size ; i < 16 ; i++){ 4213deb3ec6SMatthias Ringwald key[15-i] = 0; 4223deb3ec6SMatthias Ringwald } 4233deb3ec6SMatthias Ringwald } 4243deb3ec6SMatthias Ringwald 4253deb3ec6SMatthias Ringwald // SMP Timeout implementation 4263deb3ec6SMatthias Ringwald 4273deb3ec6SMatthias Ringwald // Upon transmission of the Pairing Request command or reception of the Pairing Request command, 4283deb3ec6SMatthias Ringwald // the Security Manager Timer shall be reset and started. 4293deb3ec6SMatthias Ringwald // 4303deb3ec6SMatthias Ringwald // The Security Manager Timer shall be reset when an L2CAP SMP command is queued for transmission. 4313deb3ec6SMatthias Ringwald // 4323deb3ec6SMatthias Ringwald // If the Security Manager Timer reaches 30 seconds, the procedure shall be considered to have failed, 4333deb3ec6SMatthias Ringwald // and the local higher layer shall be notified. No further SMP commands shall be sent over the L2CAP 4343deb3ec6SMatthias Ringwald // Security Manager Channel. A new SM procedure shall only be performed when a new physical link has been 4353deb3ec6SMatthias Ringwald // established. 4363deb3ec6SMatthias Ringwald 437ec820d77SMatthias Ringwald static void sm_timeout_handler(btstack_timer_source_t * timer){ 4383deb3ec6SMatthias Ringwald log_info("SM timeout"); 439c5b64319SMatthias Ringwald sm_connection_t * sm_conn = (sm_connection_t*) btstack_run_loop_get_timer_context(timer); 4403deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_GENERAL_TIMEOUT; 4413deb3ec6SMatthias Ringwald sm_done_for_handle(sm_conn->sm_handle); 4423deb3ec6SMatthias Ringwald 4433deb3ec6SMatthias Ringwald // trigger handling of next ready connection 4443deb3ec6SMatthias Ringwald sm_run(); 4453deb3ec6SMatthias Ringwald } 4463deb3ec6SMatthias Ringwald static void sm_timeout_start(sm_connection_t * sm_conn){ 447528a4a3bSMatthias Ringwald btstack_run_loop_remove_timer(&setup->sm_timeout); 44891a977e8SMatthias Ringwald btstack_run_loop_set_timer_context(&setup->sm_timeout, sm_conn); 449528a4a3bSMatthias Ringwald btstack_run_loop_set_timer_handler(&setup->sm_timeout, sm_timeout_handler); 450528a4a3bSMatthias Ringwald btstack_run_loop_set_timer(&setup->sm_timeout, 30000); // 30 seconds sm timeout 451528a4a3bSMatthias Ringwald btstack_run_loop_add_timer(&setup->sm_timeout); 4523deb3ec6SMatthias Ringwald } 4533deb3ec6SMatthias Ringwald static void sm_timeout_stop(void){ 454528a4a3bSMatthias Ringwald btstack_run_loop_remove_timer(&setup->sm_timeout); 4553deb3ec6SMatthias Ringwald } 4563deb3ec6SMatthias Ringwald static void sm_timeout_reset(sm_connection_t * sm_conn){ 4573deb3ec6SMatthias Ringwald sm_timeout_stop(); 4583deb3ec6SMatthias Ringwald sm_timeout_start(sm_conn); 4593deb3ec6SMatthias Ringwald } 4603deb3ec6SMatthias Ringwald 4613deb3ec6SMatthias Ringwald // end of sm timeout 4623deb3ec6SMatthias Ringwald 4633deb3ec6SMatthias Ringwald // GAP Random Address updates 4643deb3ec6SMatthias Ringwald static gap_random_address_type_t gap_random_adress_type; 465ec820d77SMatthias Ringwald static btstack_timer_source_t gap_random_address_update_timer; 4663deb3ec6SMatthias Ringwald static uint32_t gap_random_adress_update_period; 4673deb3ec6SMatthias Ringwald 4683deb3ec6SMatthias Ringwald static void gap_random_address_trigger(void){ 4693deb3ec6SMatthias Ringwald if (rau_state != RAU_IDLE) return; 4703deb3ec6SMatthias Ringwald log_info("gap_random_address_trigger"); 4713deb3ec6SMatthias Ringwald rau_state = RAU_GET_RANDOM; 4723deb3ec6SMatthias Ringwald sm_run(); 4733deb3ec6SMatthias Ringwald } 4743deb3ec6SMatthias Ringwald 475ec820d77SMatthias Ringwald static void gap_random_address_update_handler(btstack_timer_source_t * timer){ 4769ec2630cSMatthias Ringwald UNUSED(timer); 4779ec2630cSMatthias Ringwald 4783deb3ec6SMatthias Ringwald log_info("GAP Random Address Update due"); 479528a4a3bSMatthias Ringwald btstack_run_loop_set_timer(&gap_random_address_update_timer, gap_random_adress_update_period); 480528a4a3bSMatthias Ringwald btstack_run_loop_add_timer(&gap_random_address_update_timer); 4813deb3ec6SMatthias Ringwald gap_random_address_trigger(); 4823deb3ec6SMatthias Ringwald } 4833deb3ec6SMatthias Ringwald 4843deb3ec6SMatthias Ringwald static void gap_random_address_update_start(void){ 485528a4a3bSMatthias Ringwald btstack_run_loop_set_timer_handler(&gap_random_address_update_timer, gap_random_address_update_handler); 486528a4a3bSMatthias Ringwald btstack_run_loop_set_timer(&gap_random_address_update_timer, gap_random_adress_update_period); 487528a4a3bSMatthias Ringwald btstack_run_loop_add_timer(&gap_random_address_update_timer); 4883deb3ec6SMatthias Ringwald } 4893deb3ec6SMatthias Ringwald 4903deb3ec6SMatthias Ringwald static void gap_random_address_update_stop(void){ 491528a4a3bSMatthias Ringwald btstack_run_loop_remove_timer(&gap_random_address_update_timer); 4923deb3ec6SMatthias Ringwald } 4933deb3ec6SMatthias Ringwald 4943deb3ec6SMatthias Ringwald 4953deb3ec6SMatthias Ringwald static void sm_random_start(void * context){ 4963deb3ec6SMatthias Ringwald sm_random_context = context; 4973deb3ec6SMatthias Ringwald hci_send_cmd(&hci_le_rand); 4983deb3ec6SMatthias Ringwald } 4993deb3ec6SMatthias Ringwald 5007df1ef2fSMatthias Ringwald #ifdef HAVE_AES128 5017df1ef2fSMatthias Ringwald static void aes128_completed(btstack_timer_source_t * ts){ 5027df1ef2fSMatthias Ringwald UNUSED(ts); 5037df1ef2fSMatthias Ringwald sm_handle_encryption_result(&aes128_result_flipped[0]); 5047df1ef2fSMatthias Ringwald sm_run(); 5057df1ef2fSMatthias Ringwald } 5067df1ef2fSMatthias Ringwald #endif 5077df1ef2fSMatthias Ringwald 5083deb3ec6SMatthias Ringwald // pre: sm_aes128_state != SM_AES128_ACTIVE, hci_can_send_command == 1 5093deb3ec6SMatthias Ringwald // context is made availabe to aes128 result handler by this 5103deb3ec6SMatthias Ringwald static void sm_aes128_start(sm_key_t key, sm_key_t plaintext, void * context){ 5113deb3ec6SMatthias Ringwald sm_aes128_state = SM_AES128_ACTIVE; 5127df1ef2fSMatthias Ringwald sm_aes128_context = context; 5137df1ef2fSMatthias Ringwald 5147df1ef2fSMatthias Ringwald #ifdef HAVE_AES128 5157df1ef2fSMatthias Ringwald // calc result directly 5167df1ef2fSMatthias Ringwald sm_key_t result; 5177df1ef2fSMatthias Ringwald btstack_aes128_calc(key, plaintext, result); 5187df1ef2fSMatthias Ringwald 5197df1ef2fSMatthias Ringwald // log 5207df1ef2fSMatthias Ringwald log_info_key("key", key); 5217df1ef2fSMatthias Ringwald log_info_key("txt", plaintext); 5227df1ef2fSMatthias Ringwald log_info_key("res", result); 5237df1ef2fSMatthias Ringwald 5247df1ef2fSMatthias Ringwald // flip 5257df1ef2fSMatthias Ringwald reverse_128(&result[0], &aes128_result_flipped[0]); 5267df1ef2fSMatthias Ringwald 5277df1ef2fSMatthias Ringwald // deliver via timer 5287df1ef2fSMatthias Ringwald btstack_run_loop_set_timer_handler(&aes128_timer, &aes128_completed); 5297df1ef2fSMatthias Ringwald btstack_run_loop_set_timer(&aes128_timer, 0); // no delay 5307df1ef2fSMatthias Ringwald btstack_run_loop_add_timer(&aes128_timer); 5317df1ef2fSMatthias Ringwald #else 5323deb3ec6SMatthias Ringwald sm_key_t key_flipped, plaintext_flipped; 5339c80e4ccSMatthias Ringwald reverse_128(key, key_flipped); 5349c80e4ccSMatthias Ringwald reverse_128(plaintext, plaintext_flipped); 5353deb3ec6SMatthias Ringwald hci_send_cmd(&hci_le_encrypt, key_flipped, plaintext_flipped); 5367df1ef2fSMatthias Ringwald #endif 5373deb3ec6SMatthias Ringwald } 5383deb3ec6SMatthias Ringwald 5393deb3ec6SMatthias Ringwald // ah(k,r) helper 5403deb3ec6SMatthias Ringwald // r = padding || r 5413deb3ec6SMatthias Ringwald // r - 24 bit value 5424a6806f3SMatthias Ringwald static void sm_ah_r_prime(uint8_t r[3], uint8_t * r_prime){ 5433deb3ec6SMatthias Ringwald // r'= padding || r 5443deb3ec6SMatthias Ringwald memset(r_prime, 0, 16); 5453deb3ec6SMatthias Ringwald memcpy(&r_prime[13], r, 3); 5463deb3ec6SMatthias Ringwald } 5473deb3ec6SMatthias Ringwald 5483deb3ec6SMatthias Ringwald // d1 helper 5493deb3ec6SMatthias Ringwald // d' = padding || r || d 5503deb3ec6SMatthias Ringwald // d,r - 16 bit values 5514a6806f3SMatthias Ringwald static void sm_d1_d_prime(uint16_t d, uint16_t r, uint8_t * d1_prime){ 5523deb3ec6SMatthias Ringwald // d'= padding || r || d 5533deb3ec6SMatthias Ringwald memset(d1_prime, 0, 16); 554f8fbdce0SMatthias Ringwald big_endian_store_16(d1_prime, 12, r); 555f8fbdce0SMatthias Ringwald big_endian_store_16(d1_prime, 14, d); 5563deb3ec6SMatthias Ringwald } 5573deb3ec6SMatthias Ringwald 5583deb3ec6SMatthias Ringwald // dm helper 5593deb3ec6SMatthias Ringwald // r’ = padding || r 5603deb3ec6SMatthias Ringwald // r - 64 bit value 5614a6806f3SMatthias Ringwald static void sm_dm_r_prime(uint8_t r[8], uint8_t * r_prime){ 5623deb3ec6SMatthias Ringwald memset(r_prime, 0, 16); 5633deb3ec6SMatthias Ringwald memcpy(&r_prime[8], r, 8); 5643deb3ec6SMatthias Ringwald } 5653deb3ec6SMatthias Ringwald 5663deb3ec6SMatthias Ringwald // calculate arguments for first AES128 operation in C1 function 5674a6806f3SMatthias Ringwald static void sm_c1_t1(sm_key_t r, uint8_t preq[7], uint8_t pres[7], uint8_t iat, uint8_t rat, uint8_t * t1){ 5683deb3ec6SMatthias Ringwald 5693deb3ec6SMatthias Ringwald // p1 = pres || preq || rat’ || iat’ 5703deb3ec6SMatthias Ringwald // "The octet of iat’ becomes the least significant octet of p1 and the most signifi- 5713deb3ec6SMatthias Ringwald // cant octet of pres becomes the most significant octet of p1. 5723deb3ec6SMatthias Ringwald // For example, if the 8-bit iat’ is 0x01, the 8-bit rat’ is 0x00, the 56-bit preq 5733deb3ec6SMatthias Ringwald // is 0x07071000000101 and the 56 bit pres is 0x05000800000302 then 5743deb3ec6SMatthias Ringwald // p1 is 0x05000800000302070710000001010001." 5753deb3ec6SMatthias Ringwald 5763deb3ec6SMatthias Ringwald sm_key_t p1; 5779c80e4ccSMatthias Ringwald reverse_56(pres, &p1[0]); 5789c80e4ccSMatthias Ringwald reverse_56(preq, &p1[7]); 5793deb3ec6SMatthias Ringwald p1[14] = rat; 5803deb3ec6SMatthias Ringwald p1[15] = iat; 5818314c363SMatthias Ringwald log_info_key("p1", p1); 5828314c363SMatthias Ringwald log_info_key("r", r); 5833deb3ec6SMatthias Ringwald 5843deb3ec6SMatthias Ringwald // t1 = r xor p1 5853deb3ec6SMatthias Ringwald int i; 5863deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 5873deb3ec6SMatthias Ringwald t1[i] = r[i] ^ p1[i]; 5883deb3ec6SMatthias Ringwald } 5898314c363SMatthias Ringwald log_info_key("t1", t1); 5903deb3ec6SMatthias Ringwald } 5913deb3ec6SMatthias Ringwald 5923deb3ec6SMatthias Ringwald // calculate arguments for second AES128 operation in C1 function 5934a6806f3SMatthias Ringwald static void sm_c1_t3(sm_key_t t2, bd_addr_t ia, bd_addr_t ra, uint8_t * t3){ 5943deb3ec6SMatthias Ringwald // p2 = padding || ia || ra 5953deb3ec6SMatthias Ringwald // "The least significant octet of ra becomes the least significant octet of p2 and 5963deb3ec6SMatthias Ringwald // the most significant octet of padding becomes the most significant octet of p2. 5973deb3ec6SMatthias Ringwald // For example, if 48-bit ia is 0xA1A2A3A4A5A6 and the 48-bit ra is 5983deb3ec6SMatthias Ringwald // 0xB1B2B3B4B5B6 then p2 is 0x00000000A1A2A3A4A5A6B1B2B3B4B5B6. 5993deb3ec6SMatthias Ringwald 6003deb3ec6SMatthias Ringwald sm_key_t p2; 6013deb3ec6SMatthias Ringwald memset(p2, 0, 16); 6023deb3ec6SMatthias Ringwald memcpy(&p2[4], ia, 6); 6033deb3ec6SMatthias Ringwald memcpy(&p2[10], ra, 6); 6048314c363SMatthias Ringwald log_info_key("p2", p2); 6053deb3ec6SMatthias Ringwald 6063deb3ec6SMatthias Ringwald // c1 = e(k, t2_xor_p2) 6073deb3ec6SMatthias Ringwald int i; 6083deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 6093deb3ec6SMatthias Ringwald t3[i] = t2[i] ^ p2[i]; 6103deb3ec6SMatthias Ringwald } 6118314c363SMatthias Ringwald log_info_key("t3", t3); 6123deb3ec6SMatthias Ringwald } 6133deb3ec6SMatthias Ringwald 6144a6806f3SMatthias Ringwald static void sm_s1_r_prime(sm_key_t r1, sm_key_t r2, uint8_t * r_prime){ 6158314c363SMatthias Ringwald log_info_key("r1", r1); 6168314c363SMatthias Ringwald log_info_key("r2", r2); 6173deb3ec6SMatthias Ringwald memcpy(&r_prime[8], &r2[8], 8); 6183deb3ec6SMatthias Ringwald memcpy(&r_prime[0], &r1[8], 8); 6193deb3ec6SMatthias Ringwald } 6203deb3ec6SMatthias Ringwald 621e53be891SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 622e53be891SMatthias Ringwald // Software implementations of crypto toolbox for LE Secure Connection 623e53be891SMatthias Ringwald // TODO: replace with code to use AES Engine of HCI Controller 624e53be891SMatthias Ringwald typedef uint8_t sm_key24_t[3]; 625e53be891SMatthias Ringwald typedef uint8_t sm_key56_t[7]; 626e53be891SMatthias Ringwald typedef uint8_t sm_key256_t[32]; 627e53be891SMatthias Ringwald 628bd57ffebSMatthias Ringwald #if 0 629e53be891SMatthias Ringwald static void aes128_calc_cyphertext(const uint8_t key[16], const uint8_t plaintext[16], uint8_t cyphertext[16]){ 630e53be891SMatthias Ringwald uint32_t rk[RKLENGTH(KEYBITS)]; 631e53be891SMatthias Ringwald int nrounds = rijndaelSetupEncrypt(rk, &key[0], KEYBITS); 632e53be891SMatthias Ringwald rijndaelEncrypt(rk, nrounds, plaintext, cyphertext); 633e53be891SMatthias Ringwald } 634e53be891SMatthias Ringwald 635e53be891SMatthias Ringwald static void calc_subkeys(sm_key_t k0, sm_key_t k1, sm_key_t k2){ 636e53be891SMatthias Ringwald memcpy(k1, k0, 16); 637e53be891SMatthias Ringwald sm_shift_left_by_one_bit_inplace(16, k1); 638e53be891SMatthias Ringwald if (k0[0] & 0x80){ 639e53be891SMatthias Ringwald k1[15] ^= 0x87; 640e53be891SMatthias Ringwald } 641e53be891SMatthias Ringwald memcpy(k2, k1, 16); 642e53be891SMatthias Ringwald sm_shift_left_by_one_bit_inplace(16, k2); 643e53be891SMatthias Ringwald if (k1[0] & 0x80){ 644e53be891SMatthias Ringwald k2[15] ^= 0x87; 645e53be891SMatthias Ringwald } 646e53be891SMatthias Ringwald } 647e53be891SMatthias Ringwald 648e53be891SMatthias Ringwald static void aes_cmac(sm_key_t aes_cmac, const sm_key_t key, const uint8_t * data, int cmac_message_len){ 649e53be891SMatthias Ringwald sm_key_t k0, k1, k2, zero; 650e53be891SMatthias Ringwald memset(zero, 0, 16); 651e53be891SMatthias Ringwald 652e53be891SMatthias Ringwald aes128_calc_cyphertext(key, zero, k0); 653e53be891SMatthias Ringwald calc_subkeys(k0, k1, k2); 654e53be891SMatthias Ringwald 655e53be891SMatthias Ringwald int cmac_block_count = (cmac_message_len + 15) / 16; 656e53be891SMatthias Ringwald 657e53be891SMatthias Ringwald // step 3: .. 658e53be891SMatthias Ringwald if (cmac_block_count==0){ 659e53be891SMatthias Ringwald cmac_block_count = 1; 660e53be891SMatthias Ringwald } 661e53be891SMatthias Ringwald 662e53be891SMatthias Ringwald // step 4: set m_last 663e53be891SMatthias Ringwald sm_key_t cmac_m_last; 664e53be891SMatthias Ringwald int sm_cmac_last_block_complete = cmac_message_len != 0 && (cmac_message_len & 0x0f) == 0; 665e53be891SMatthias Ringwald int i; 666e53be891SMatthias Ringwald if (sm_cmac_last_block_complete){ 667e53be891SMatthias Ringwald for (i=0;i<16;i++){ 668e53be891SMatthias Ringwald cmac_m_last[i] = data[cmac_message_len - 16 + i] ^ k1[i]; 669e53be891SMatthias Ringwald } 670e53be891SMatthias Ringwald } else { 671e53be891SMatthias Ringwald int valid_octets_in_last_block = cmac_message_len & 0x0f; 672e53be891SMatthias Ringwald for (i=0;i<16;i++){ 673e53be891SMatthias Ringwald if (i < valid_octets_in_last_block){ 674e53be891SMatthias Ringwald cmac_m_last[i] = data[(cmac_message_len & 0xfff0) + i] ^ k2[i]; 675e53be891SMatthias Ringwald continue; 676e53be891SMatthias Ringwald } 677e53be891SMatthias Ringwald if (i == valid_octets_in_last_block){ 678e53be891SMatthias Ringwald cmac_m_last[i] = 0x80 ^ k2[i]; 679e53be891SMatthias Ringwald continue; 680e53be891SMatthias Ringwald } 681e53be891SMatthias Ringwald cmac_m_last[i] = k2[i]; 682e53be891SMatthias Ringwald } 683e53be891SMatthias Ringwald } 684e53be891SMatthias Ringwald 685e53be891SMatthias Ringwald // printf("sm_cmac_start: len %u, block count %u\n", cmac_message_len, cmac_block_count); 686e53be891SMatthias Ringwald // LOG_KEY(cmac_m_last); 687e53be891SMatthias Ringwald 688e53be891SMatthias Ringwald // Step 5 689e53be891SMatthias Ringwald sm_key_t cmac_x; 690e53be891SMatthias Ringwald memset(cmac_x, 0, 16); 691e53be891SMatthias Ringwald 692e53be891SMatthias Ringwald // Step 6 693e53be891SMatthias Ringwald sm_key_t sm_cmac_y; 694e53be891SMatthias Ringwald for (int block = 0 ; block < cmac_block_count-1 ; block++){ 695e53be891SMatthias Ringwald for (i=0;i<16;i++){ 696e53be891SMatthias Ringwald sm_cmac_y[i] = cmac_x[i] ^ data[block * 16 + i]; 697e53be891SMatthias Ringwald } 698e53be891SMatthias Ringwald aes128_calc_cyphertext(key, sm_cmac_y, cmac_x); 699e53be891SMatthias Ringwald } 700e53be891SMatthias Ringwald for (i=0;i<16;i++){ 701e53be891SMatthias Ringwald sm_cmac_y[i] = cmac_x[i] ^ cmac_m_last[i]; 702e53be891SMatthias Ringwald } 703e53be891SMatthias Ringwald 704e53be891SMatthias Ringwald // Step 7 705e53be891SMatthias Ringwald aes128_calc_cyphertext(key, sm_cmac_y, aes_cmac); 706e53be891SMatthias Ringwald } 707bd57ffebSMatthias Ringwald #endif 708e53be891SMatthias Ringwald #endif 709e53be891SMatthias Ringwald 710711e6c80SMatthias Ringwald static void sm_setup_event_base(uint8_t * event, int event_size, uint8_t type, hci_con_handle_t con_handle, uint8_t addr_type, bd_addr_t address){ 7113deb3ec6SMatthias Ringwald event[0] = type; 7123deb3ec6SMatthias Ringwald event[1] = event_size - 2; 713711e6c80SMatthias Ringwald little_endian_store_16(event, 2, con_handle); 7143deb3ec6SMatthias Ringwald event[4] = addr_type; 715724d70a2SMatthias Ringwald reverse_bd_addr(address, &event[5]); 7163deb3ec6SMatthias Ringwald } 7173deb3ec6SMatthias Ringwald 71889a78d34SMatthias Ringwald static void sm_dispatch_event(uint8_t packet_type, uint16_t channel, uint8_t * packet, uint16_t size){ 7199ec2630cSMatthias Ringwald UNUSED(channel); 7209ec2630cSMatthias Ringwald 72113377825SMatthias Ringwald // log event 72213377825SMatthias Ringwald hci_dump_packet(packet_type, 1, packet, size); 72389a78d34SMatthias Ringwald // dispatch to all event handlers 72489a78d34SMatthias Ringwald btstack_linked_list_iterator_t it; 72589a78d34SMatthias Ringwald btstack_linked_list_iterator_init(&it, &sm_event_handlers); 72689a78d34SMatthias Ringwald while (btstack_linked_list_iterator_has_next(&it)){ 72789a78d34SMatthias Ringwald btstack_packet_callback_registration_t * entry = (btstack_packet_callback_registration_t*) btstack_linked_list_iterator_next(&it); 728d9a7306aSMatthias Ringwald entry->callback(packet_type, 0, packet, size); 72989a78d34SMatthias Ringwald } 73089a78d34SMatthias Ringwald } 73189a78d34SMatthias Ringwald 732711e6c80SMatthias Ringwald static void sm_notify_client_base(uint8_t type, hci_con_handle_t con_handle, uint8_t addr_type, bd_addr_t address){ 7333deb3ec6SMatthias Ringwald uint8_t event[11]; 734711e6c80SMatthias Ringwald sm_setup_event_base(event, sizeof(event), type, con_handle, addr_type, address); 73589a78d34SMatthias Ringwald sm_dispatch_event(HCI_EVENT_PACKET, 0, event, sizeof(event)); 7363deb3ec6SMatthias Ringwald } 7373deb3ec6SMatthias Ringwald 738711e6c80SMatthias Ringwald static void sm_notify_client_passkey(uint8_t type, hci_con_handle_t con_handle, uint8_t addr_type, bd_addr_t address, uint32_t passkey){ 7393deb3ec6SMatthias Ringwald uint8_t event[15]; 740711e6c80SMatthias Ringwald sm_setup_event_base(event, sizeof(event), type, con_handle, addr_type, address); 741f8fbdce0SMatthias Ringwald little_endian_store_32(event, 11, passkey); 74289a78d34SMatthias Ringwald sm_dispatch_event(HCI_EVENT_PACKET, 0, event, sizeof(event)); 7433deb3ec6SMatthias Ringwald } 7443deb3ec6SMatthias Ringwald 745711e6c80SMatthias Ringwald static void sm_notify_client_index(uint8_t type, hci_con_handle_t con_handle, uint8_t addr_type, bd_addr_t address, uint16_t index){ 74613377825SMatthias Ringwald // fetch addr and addr type from db 74713377825SMatthias Ringwald bd_addr_t identity_address; 74813377825SMatthias Ringwald int identity_address_type; 74913377825SMatthias Ringwald le_device_db_info(index, &identity_address_type, identity_address, NULL); 75013377825SMatthias Ringwald 751334126b3SMatthias Ringwald uint8_t event[19]; 752711e6c80SMatthias Ringwald sm_setup_event_base(event, sizeof(event), type, con_handle, addr_type, address); 75313377825SMatthias Ringwald event[11] = identity_address_type; 75413377825SMatthias Ringwald reverse_bd_addr(identity_address, &event[12]); 755334126b3SMatthias Ringwald event[18] = index; 75689a78d34SMatthias Ringwald sm_dispatch_event(HCI_EVENT_PACKET, 0, event, sizeof(event)); 7573deb3ec6SMatthias Ringwald } 7583deb3ec6SMatthias Ringwald 759711e6c80SMatthias Ringwald static void sm_notify_client_authorization(uint8_t type, hci_con_handle_t con_handle, uint8_t addr_type, bd_addr_t address, uint8_t result){ 7603deb3ec6SMatthias Ringwald 7613deb3ec6SMatthias Ringwald uint8_t event[18]; 762711e6c80SMatthias Ringwald sm_setup_event_base(event, sizeof(event), type, con_handle, addr_type, address); 7633deb3ec6SMatthias Ringwald event[11] = result; 76489a78d34SMatthias Ringwald sm_dispatch_event(HCI_EVENT_PACKET, 0, (uint8_t*) &event, sizeof(event)); 7653deb3ec6SMatthias Ringwald } 7663deb3ec6SMatthias Ringwald 7673deb3ec6SMatthias Ringwald // decide on stk generation based on 7683deb3ec6SMatthias Ringwald // - pairing request 7693deb3ec6SMatthias Ringwald // - io capabilities 7703deb3ec6SMatthias Ringwald // - OOB data availability 7713deb3ec6SMatthias Ringwald static void sm_setup_tk(void){ 7723deb3ec6SMatthias Ringwald 7733deb3ec6SMatthias Ringwald // default: just works 7743deb3ec6SMatthias Ringwald setup->sm_stk_generation_method = JUST_WORKS; 7753deb3ec6SMatthias Ringwald 77627c32905SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 77727c32905SMatthias Ringwald setup->sm_use_secure_connections = ( sm_pairing_packet_get_auth_req(setup->sm_m_preq) 77827c32905SMatthias Ringwald & sm_pairing_packet_get_auth_req(setup->sm_s_pres) 77927c32905SMatthias Ringwald & SM_AUTHREQ_SECURE_CONNECTION ) != 0; 780446a8c36SMatthias Ringwald memset(setup->sm_ra, 0, 16); 781446a8c36SMatthias Ringwald memset(setup->sm_rb, 0, 16); 78227c32905SMatthias Ringwald #else 78327c32905SMatthias Ringwald setup->sm_use_secure_connections = 0; 78427c32905SMatthias Ringwald #endif 78527c32905SMatthias Ringwald 78627c32905SMatthias Ringwald // If both devices have not set the MITM option in the Authentication Requirements 78727c32905SMatthias Ringwald // Flags, then the IO capabilities shall be ignored and the Just Works association 78827c32905SMatthias Ringwald // model shall be used. 78927c32905SMatthias Ringwald if (((sm_pairing_packet_get_auth_req(setup->sm_m_preq) & SM_AUTHREQ_MITM_PROTECTION) == 0) 79027c32905SMatthias Ringwald && ((sm_pairing_packet_get_auth_req(setup->sm_s_pres) & SM_AUTHREQ_MITM_PROTECTION) == 0)){ 79127c32905SMatthias Ringwald log_info("SM: MITM not required by both -> JUST WORKS"); 79227c32905SMatthias Ringwald return; 79327c32905SMatthias Ringwald } 79427c32905SMatthias Ringwald 79527c32905SMatthias Ringwald // TODO: with LE SC, OOB is used to transfer data OOB during pairing, single device with OOB is sufficient 79627c32905SMatthias Ringwald 7973deb3ec6SMatthias Ringwald // If both devices have out of band authentication data, then the Authentication 7983deb3ec6SMatthias Ringwald // Requirements Flags shall be ignored when selecting the pairing method and the 7993deb3ec6SMatthias Ringwald // Out of Band pairing method shall be used. 8001ad129beSMatthias Ringwald if (sm_pairing_packet_get_oob_data_flag(setup->sm_m_preq) 8011ad129beSMatthias Ringwald && sm_pairing_packet_get_oob_data_flag(setup->sm_s_pres)){ 8023deb3ec6SMatthias Ringwald log_info("SM: have OOB data"); 8038314c363SMatthias Ringwald log_info_key("OOB", setup->sm_tk); 8043deb3ec6SMatthias Ringwald setup->sm_stk_generation_method = OOB; 8053deb3ec6SMatthias Ringwald return; 8063deb3ec6SMatthias Ringwald } 8073deb3ec6SMatthias Ringwald 8083deb3ec6SMatthias Ringwald // Reset TK as it has been setup in sm_init_setup 8093deb3ec6SMatthias Ringwald sm_reset_tk(); 8103deb3ec6SMatthias Ringwald 8113deb3ec6SMatthias Ringwald // Also use just works if unknown io capabilites 8128da2e96dSMatthias Ringwald if ((sm_pairing_packet_get_io_capability(setup->sm_m_preq) > IO_CAPABILITY_KEYBOARD_DISPLAY) || (sm_pairing_packet_get_io_capability(setup->sm_s_pres) > IO_CAPABILITY_KEYBOARD_DISPLAY)){ 8133deb3ec6SMatthias Ringwald return; 8143deb3ec6SMatthias Ringwald } 8153deb3ec6SMatthias Ringwald 8163deb3ec6SMatthias Ringwald // Otherwise the IO capabilities of the devices shall be used to determine the 8173deb3ec6SMatthias Ringwald // pairing method as defined in Table 2.4. 81827c32905SMatthias Ringwald // see http://stackoverflow.com/a/1052837/393697 for how to specify pointer to 2-dimensional array 81927c32905SMatthias Ringwald const stk_generation_method_t (*generation_method)[5] = stk_generation_method; 82027c32905SMatthias Ringwald 82127c32905SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 822c6b7cbd9SMatthias Ringwald // table not define by default 82327c32905SMatthias Ringwald if (setup->sm_use_secure_connections){ 82427c32905SMatthias Ringwald generation_method = stk_generation_method_with_secure_connection; 82527c32905SMatthias Ringwald } 82627c32905SMatthias Ringwald #endif 82727c32905SMatthias Ringwald setup->sm_stk_generation_method = generation_method[sm_pairing_packet_get_io_capability(setup->sm_s_pres)][sm_pairing_packet_get_io_capability(setup->sm_m_preq)]; 82827c32905SMatthias Ringwald 8293deb3ec6SMatthias Ringwald log_info("sm_setup_tk: master io cap: %u, slave io cap: %u -> method %u", 8301ad129beSMatthias Ringwald sm_pairing_packet_get_io_capability(setup->sm_m_preq), sm_pairing_packet_get_io_capability(setup->sm_s_pres), setup->sm_stk_generation_method); 8313deb3ec6SMatthias Ringwald } 8323deb3ec6SMatthias Ringwald 8333deb3ec6SMatthias Ringwald static int sm_key_distribution_flags_for_set(uint8_t key_set){ 8343deb3ec6SMatthias Ringwald int flags = 0; 8353deb3ec6SMatthias Ringwald if (key_set & SM_KEYDIST_ENC_KEY){ 8363deb3ec6SMatthias Ringwald flags |= SM_KEYDIST_FLAG_ENCRYPTION_INFORMATION; 8373deb3ec6SMatthias Ringwald flags |= SM_KEYDIST_FLAG_MASTER_IDENTIFICATION; 8383deb3ec6SMatthias Ringwald } 8393deb3ec6SMatthias Ringwald if (key_set & SM_KEYDIST_ID_KEY){ 8403deb3ec6SMatthias Ringwald flags |= SM_KEYDIST_FLAG_IDENTITY_INFORMATION; 8413deb3ec6SMatthias Ringwald flags |= SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION; 8423deb3ec6SMatthias Ringwald } 8433deb3ec6SMatthias Ringwald if (key_set & SM_KEYDIST_SIGN){ 8443deb3ec6SMatthias Ringwald flags |= SM_KEYDIST_FLAG_SIGNING_IDENTIFICATION; 8453deb3ec6SMatthias Ringwald } 8463deb3ec6SMatthias Ringwald return flags; 8473deb3ec6SMatthias Ringwald } 8483deb3ec6SMatthias Ringwald 8493deb3ec6SMatthias Ringwald static void sm_setup_key_distribution(uint8_t key_set){ 8503deb3ec6SMatthias Ringwald setup->sm_key_distribution_received_set = 0; 8513deb3ec6SMatthias Ringwald setup->sm_key_distribution_send_set = sm_key_distribution_flags_for_set(key_set); 8523deb3ec6SMatthias Ringwald } 8533deb3ec6SMatthias Ringwald 8543deb3ec6SMatthias Ringwald // CSRK Key Lookup 8553deb3ec6SMatthias Ringwald 8563deb3ec6SMatthias Ringwald 8573deb3ec6SMatthias Ringwald static int sm_address_resolution_idle(void){ 8583deb3ec6SMatthias Ringwald return sm_address_resolution_mode == ADDRESS_RESOLUTION_IDLE; 8593deb3ec6SMatthias Ringwald } 8603deb3ec6SMatthias Ringwald 861711e6c80SMatthias Ringwald static void sm_address_resolution_start_lookup(uint8_t addr_type, hci_con_handle_t con_handle, bd_addr_t addr, address_resolution_mode_t mode, void * context){ 8623deb3ec6SMatthias Ringwald memcpy(sm_address_resolution_address, addr, 6); 8633deb3ec6SMatthias Ringwald sm_address_resolution_addr_type = addr_type; 8643deb3ec6SMatthias Ringwald sm_address_resolution_test = 0; 8653deb3ec6SMatthias Ringwald sm_address_resolution_mode = mode; 8663deb3ec6SMatthias Ringwald sm_address_resolution_context = context; 867711e6c80SMatthias Ringwald sm_notify_client_base(SM_EVENT_IDENTITY_RESOLVING_STARTED, con_handle, addr_type, addr); 8683deb3ec6SMatthias Ringwald } 8693deb3ec6SMatthias Ringwald 8703deb3ec6SMatthias Ringwald int sm_address_resolution_lookup(uint8_t address_type, bd_addr_t address){ 8713deb3ec6SMatthias Ringwald // check if already in list 872665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 8733deb3ec6SMatthias Ringwald sm_lookup_entry_t * entry; 874665d90f2SMatthias Ringwald btstack_linked_list_iterator_init(&it, &sm_address_resolution_general_queue); 875665d90f2SMatthias Ringwald while(btstack_linked_list_iterator_has_next(&it)){ 876665d90f2SMatthias Ringwald entry = (sm_lookup_entry_t *) btstack_linked_list_iterator_next(&it); 8773deb3ec6SMatthias Ringwald if (entry->address_type != address_type) continue; 8783deb3ec6SMatthias Ringwald if (memcmp(entry->address, address, 6)) continue; 8793deb3ec6SMatthias Ringwald // already in list 8803deb3ec6SMatthias Ringwald return BTSTACK_BUSY; 8813deb3ec6SMatthias Ringwald } 8823deb3ec6SMatthias Ringwald entry = btstack_memory_sm_lookup_entry_get(); 8833deb3ec6SMatthias Ringwald if (!entry) return BTSTACK_MEMORY_ALLOC_FAILED; 8843deb3ec6SMatthias Ringwald entry->address_type = (bd_addr_type_t) address_type; 8853deb3ec6SMatthias Ringwald memcpy(entry->address, address, 6); 886665d90f2SMatthias Ringwald btstack_linked_list_add(&sm_address_resolution_general_queue, (btstack_linked_item_t *) entry); 8873deb3ec6SMatthias Ringwald sm_run(); 8883deb3ec6SMatthias Ringwald return 0; 8893deb3ec6SMatthias Ringwald } 8903deb3ec6SMatthias Ringwald 8913deb3ec6SMatthias Ringwald // while x_state++ for an enum is possible in C, it isn't in C++. we use this helpers to avoid compile errors for now 8923deb3ec6SMatthias Ringwald static inline void sm_next_responding_state(sm_connection_t * sm_conn){ 8933deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = (security_manager_state_t) (((int)sm_conn->sm_engine_state) + 1); 8943deb3ec6SMatthias Ringwald } 8953deb3ec6SMatthias Ringwald static inline void dkg_next_state(void){ 8963deb3ec6SMatthias Ringwald dkg_state = (derived_key_generation_t) (((int)dkg_state) + 1); 8973deb3ec6SMatthias Ringwald } 8983deb3ec6SMatthias Ringwald static inline void rau_next_state(void){ 8993deb3ec6SMatthias Ringwald rau_state = (random_address_update_t) (((int)rau_state) + 1); 9003deb3ec6SMatthias Ringwald } 901514d35fcSMatthias Ringwald 902514d35fcSMatthias Ringwald // CMAC calculation using AES Engine 9037a766ebfSMatthias Ringwald #ifdef ENABLE_CMAC_ENGINE 904514d35fcSMatthias Ringwald 9053deb3ec6SMatthias Ringwald static inline void sm_cmac_next_state(void){ 9063deb3ec6SMatthias Ringwald sm_cmac_state = (cmac_state_t) (((int)sm_cmac_state) + 1); 9073deb3ec6SMatthias Ringwald } 908514d35fcSMatthias Ringwald 9093deb3ec6SMatthias Ringwald static int sm_cmac_last_block_complete(void){ 9103deb3ec6SMatthias Ringwald if (sm_cmac_message_len == 0) return 0; 9113deb3ec6SMatthias Ringwald return (sm_cmac_message_len & 0x0f) == 0; 9123deb3ec6SMatthias Ringwald } 913514d35fcSMatthias Ringwald 9144dfd504aSMatthias Ringwald int sm_cmac_ready(void){ 9154dfd504aSMatthias Ringwald return sm_cmac_state == CMAC_IDLE; 9163deb3ec6SMatthias Ringwald } 9173deb3ec6SMatthias Ringwald 918514d35fcSMatthias Ringwald // generic cmac calculation 919aec94140SMatthias Ringwald void sm_cmac_general_start(const sm_key_t key, uint16_t message_len, uint8_t (*get_byte_callback)(uint16_t offset), void (*done_callback)(uint8_t hash[8])){ 920514d35fcSMatthias Ringwald // Generalized CMAC 921514d35fcSMatthias Ringwald memcpy(sm_cmac_k, key, 16); 9223deb3ec6SMatthias Ringwald memset(sm_cmac_x, 0, 16); 923514d35fcSMatthias Ringwald sm_cmac_block_current = 0; 924514d35fcSMatthias Ringwald sm_cmac_message_len = message_len; 925514d35fcSMatthias Ringwald sm_cmac_done_handler = done_callback; 926514d35fcSMatthias Ringwald sm_cmac_get_byte = get_byte_callback; 9273deb3ec6SMatthias Ringwald 9283deb3ec6SMatthias Ringwald // step 2: n := ceil(len/const_Bsize); 9293deb3ec6SMatthias Ringwald sm_cmac_block_count = (sm_cmac_message_len + 15) / 16; 9303deb3ec6SMatthias Ringwald 9313deb3ec6SMatthias Ringwald // step 3: .. 9323deb3ec6SMatthias Ringwald if (sm_cmac_block_count==0){ 9333deb3ec6SMatthias Ringwald sm_cmac_block_count = 1; 9343deb3ec6SMatthias Ringwald } 935514d35fcSMatthias Ringwald log_info("sm_cmac_general_start: len %u, block count %u", sm_cmac_message_len, sm_cmac_block_count); 9363deb3ec6SMatthias Ringwald 9373deb3ec6SMatthias Ringwald // first, we need to compute l for k1, k2, and m_last 9383deb3ec6SMatthias Ringwald sm_cmac_state = CMAC_CALC_SUBKEYS; 9393deb3ec6SMatthias Ringwald 9403deb3ec6SMatthias Ringwald // let's go 9413deb3ec6SMatthias Ringwald sm_run(); 9423deb3ec6SMatthias Ringwald } 9437a766ebfSMatthias Ringwald #endif 9443deb3ec6SMatthias Ringwald 945514d35fcSMatthias Ringwald // cmac for ATT Message signing 9467a766ebfSMatthias Ringwald #ifdef ENABLE_LE_SIGNED_WRITE 9474dfd504aSMatthias Ringwald static uint8_t sm_cmac_signed_write_message_get_byte(uint16_t offset){ 9484dfd504aSMatthias Ringwald if (offset >= sm_cmac_message_len) { 9494dfd504aSMatthias Ringwald log_error("sm_cmac_signed_write_message_get_byte. out of bounds, access %u, len %u", offset, sm_cmac_message_len); 9504dfd504aSMatthias Ringwald return 0; 9514dfd504aSMatthias Ringwald } 9524dfd504aSMatthias Ringwald 9534dfd504aSMatthias Ringwald offset = sm_cmac_message_len - 1 - offset; 9544dfd504aSMatthias Ringwald 9554dfd504aSMatthias Ringwald // sm_cmac_header[3] | message[] | sm_cmac_sign_counter[4] 9564dfd504aSMatthias Ringwald if (offset < 3){ 9574dfd504aSMatthias Ringwald return sm_cmac_header[offset]; 9584dfd504aSMatthias Ringwald } 9594dfd504aSMatthias Ringwald int actual_message_len_incl_header = sm_cmac_message_len - 4; 9604dfd504aSMatthias Ringwald if (offset < actual_message_len_incl_header){ 9614dfd504aSMatthias Ringwald return sm_cmac_message[offset - 3]; 9624dfd504aSMatthias Ringwald } 9634dfd504aSMatthias Ringwald return sm_cmac_sign_counter[offset - actual_message_len_incl_header]; 9644dfd504aSMatthias Ringwald } 9654dfd504aSMatthias Ringwald 9664dfd504aSMatthias Ringwald void sm_cmac_signed_write_start(const sm_key_t k, uint8_t opcode, hci_con_handle_t con_handle, uint16_t message_len, const uint8_t * message, uint32_t sign_counter, void (*done_handler)(uint8_t * hash)){ 967514d35fcSMatthias Ringwald // ATT Message Signing 968514d35fcSMatthias Ringwald sm_cmac_header[0] = opcode; 969514d35fcSMatthias Ringwald little_endian_store_16(sm_cmac_header, 1, con_handle); 970514d35fcSMatthias Ringwald little_endian_store_32(sm_cmac_sign_counter, 0, sign_counter); 971514d35fcSMatthias Ringwald uint16_t total_message_len = 3 + message_len + 4; // incl. virtually prepended att opcode, handle and appended sign_counter in LE 972514d35fcSMatthias Ringwald sm_cmac_message = message; 9734dfd504aSMatthias Ringwald sm_cmac_general_start(k, total_message_len, &sm_cmac_signed_write_message_get_byte, done_handler); 974514d35fcSMatthias Ringwald } 9757a766ebfSMatthias Ringwald #endif 976514d35fcSMatthias Ringwald 9777a766ebfSMatthias Ringwald #ifdef ENABLE_CMAC_ENGINE 9783deb3ec6SMatthias Ringwald static void sm_cmac_handle_aes_engine_ready(void){ 9793deb3ec6SMatthias Ringwald switch (sm_cmac_state){ 9803deb3ec6SMatthias Ringwald case CMAC_CALC_SUBKEYS: { 9813deb3ec6SMatthias Ringwald sm_key_t const_zero; 9823deb3ec6SMatthias Ringwald memset(const_zero, 0, 16); 9833deb3ec6SMatthias Ringwald sm_cmac_next_state(); 9843deb3ec6SMatthias Ringwald sm_aes128_start(sm_cmac_k, const_zero, NULL); 9853deb3ec6SMatthias Ringwald break; 9863deb3ec6SMatthias Ringwald } 9873deb3ec6SMatthias Ringwald case CMAC_CALC_MI: { 9883deb3ec6SMatthias Ringwald int j; 9893deb3ec6SMatthias Ringwald sm_key_t y; 9903deb3ec6SMatthias Ringwald for (j=0;j<16;j++){ 991514d35fcSMatthias Ringwald y[j] = sm_cmac_x[j] ^ sm_cmac_get_byte(sm_cmac_block_current*16 + j); 9923deb3ec6SMatthias Ringwald } 9933deb3ec6SMatthias Ringwald sm_cmac_block_current++; 9943deb3ec6SMatthias Ringwald sm_cmac_next_state(); 9953deb3ec6SMatthias Ringwald sm_aes128_start(sm_cmac_k, y, NULL); 9963deb3ec6SMatthias Ringwald break; 9973deb3ec6SMatthias Ringwald } 9983deb3ec6SMatthias Ringwald case CMAC_CALC_MLAST: { 9993deb3ec6SMatthias Ringwald int i; 10003deb3ec6SMatthias Ringwald sm_key_t y; 10013deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 10023deb3ec6SMatthias Ringwald y[i] = sm_cmac_x[i] ^ sm_cmac_m_last[i]; 10033deb3ec6SMatthias Ringwald } 10048314c363SMatthias Ringwald log_info_key("Y", y); 10053deb3ec6SMatthias Ringwald sm_cmac_block_current++; 10063deb3ec6SMatthias Ringwald sm_cmac_next_state(); 10073deb3ec6SMatthias Ringwald sm_aes128_start(sm_cmac_k, y, NULL); 10083deb3ec6SMatthias Ringwald break; 10093deb3ec6SMatthias Ringwald } 10103deb3ec6SMatthias Ringwald default: 10113deb3ec6SMatthias Ringwald log_info("sm_cmac_handle_aes_engine_ready called in state %u", sm_cmac_state); 10123deb3ec6SMatthias Ringwald break; 10133deb3ec6SMatthias Ringwald } 10143deb3ec6SMatthias Ringwald } 10153deb3ec6SMatthias Ringwald 10167a766ebfSMatthias Ringwald // CMAC Implementation using AES128 engine 10177a766ebfSMatthias Ringwald static void sm_shift_left_by_one_bit_inplace(int len, uint8_t * data){ 10187a766ebfSMatthias Ringwald int i; 10197a766ebfSMatthias Ringwald int carry = 0; 10207a766ebfSMatthias Ringwald for (i=len-1; i >= 0 ; i--){ 10217a766ebfSMatthias Ringwald int new_carry = data[i] >> 7; 10227a766ebfSMatthias Ringwald data[i] = data[i] << 1 | carry; 10237a766ebfSMatthias Ringwald carry = new_carry; 10247a766ebfSMatthias Ringwald } 10257a766ebfSMatthias Ringwald } 10267a766ebfSMatthias Ringwald 10273deb3ec6SMatthias Ringwald static void sm_cmac_handle_encryption_result(sm_key_t data){ 10283deb3ec6SMatthias Ringwald switch (sm_cmac_state){ 10293deb3ec6SMatthias Ringwald case CMAC_W4_SUBKEYS: { 10303deb3ec6SMatthias Ringwald sm_key_t k1; 10313deb3ec6SMatthias Ringwald memcpy(k1, data, 16); 10323deb3ec6SMatthias Ringwald sm_shift_left_by_one_bit_inplace(16, k1); 10333deb3ec6SMatthias Ringwald if (data[0] & 0x80){ 10343deb3ec6SMatthias Ringwald k1[15] ^= 0x87; 10353deb3ec6SMatthias Ringwald } 10363deb3ec6SMatthias Ringwald sm_key_t k2; 10373deb3ec6SMatthias Ringwald memcpy(k2, k1, 16); 10383deb3ec6SMatthias Ringwald sm_shift_left_by_one_bit_inplace(16, k2); 10393deb3ec6SMatthias Ringwald if (k1[0] & 0x80){ 10403deb3ec6SMatthias Ringwald k2[15] ^= 0x87; 10413deb3ec6SMatthias Ringwald } 10423deb3ec6SMatthias Ringwald 10438314c363SMatthias Ringwald log_info_key("k", sm_cmac_k); 10448314c363SMatthias Ringwald log_info_key("k1", k1); 10458314c363SMatthias Ringwald log_info_key("k2", k2); 10463deb3ec6SMatthias Ringwald 10473deb3ec6SMatthias Ringwald // step 4: set m_last 10483deb3ec6SMatthias Ringwald int i; 10493deb3ec6SMatthias Ringwald if (sm_cmac_last_block_complete()){ 10503deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 1051514d35fcSMatthias Ringwald sm_cmac_m_last[i] = sm_cmac_get_byte(sm_cmac_message_len - 16 + i) ^ k1[i]; 10523deb3ec6SMatthias Ringwald } 10533deb3ec6SMatthias Ringwald } else { 10543deb3ec6SMatthias Ringwald int valid_octets_in_last_block = sm_cmac_message_len & 0x0f; 10553deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 10563deb3ec6SMatthias Ringwald if (i < valid_octets_in_last_block){ 1057514d35fcSMatthias Ringwald sm_cmac_m_last[i] = sm_cmac_get_byte((sm_cmac_message_len & 0xfff0) + i) ^ k2[i]; 10583deb3ec6SMatthias Ringwald continue; 10593deb3ec6SMatthias Ringwald } 10603deb3ec6SMatthias Ringwald if (i == valid_octets_in_last_block){ 10613deb3ec6SMatthias Ringwald sm_cmac_m_last[i] = 0x80 ^ k2[i]; 10623deb3ec6SMatthias Ringwald continue; 10633deb3ec6SMatthias Ringwald } 10643deb3ec6SMatthias Ringwald sm_cmac_m_last[i] = k2[i]; 10653deb3ec6SMatthias Ringwald } 10663deb3ec6SMatthias Ringwald } 10673deb3ec6SMatthias Ringwald 10683deb3ec6SMatthias Ringwald // next 10693deb3ec6SMatthias Ringwald sm_cmac_state = sm_cmac_block_current < sm_cmac_block_count - 1 ? CMAC_CALC_MI : CMAC_CALC_MLAST; 10703deb3ec6SMatthias Ringwald break; 10713deb3ec6SMatthias Ringwald } 10723deb3ec6SMatthias Ringwald case CMAC_W4_MI: 10733deb3ec6SMatthias Ringwald memcpy(sm_cmac_x, data, 16); 10743deb3ec6SMatthias Ringwald sm_cmac_state = sm_cmac_block_current < sm_cmac_block_count - 1 ? CMAC_CALC_MI : CMAC_CALC_MLAST; 10753deb3ec6SMatthias Ringwald break; 10763deb3ec6SMatthias Ringwald case CMAC_W4_MLAST: 10773deb3ec6SMatthias Ringwald // done 10780346c37cSMatthias Ringwald log_info("Setting CMAC Engine to IDLE"); 10790346c37cSMatthias Ringwald sm_cmac_state = CMAC_IDLE; 10808314c363SMatthias Ringwald log_info_key("CMAC", data); 10813deb3ec6SMatthias Ringwald sm_cmac_done_handler(data); 10823deb3ec6SMatthias Ringwald break; 10833deb3ec6SMatthias Ringwald default: 10843deb3ec6SMatthias Ringwald log_info("sm_cmac_handle_encryption_result called in state %u", sm_cmac_state); 10853deb3ec6SMatthias Ringwald break; 10863deb3ec6SMatthias Ringwald } 10873deb3ec6SMatthias Ringwald } 10887a766ebfSMatthias Ringwald #endif 10893deb3ec6SMatthias Ringwald 10903deb3ec6SMatthias Ringwald static void sm_trigger_user_response(sm_connection_t * sm_conn){ 1091446a8c36SMatthias Ringwald // notify client for: JUST WORKS confirm, Numeric comparison confirm, PASSKEY display or input 10923deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_IDLE; 10933deb3ec6SMatthias Ringwald switch (setup->sm_stk_generation_method){ 10943deb3ec6SMatthias Ringwald case PK_RESP_INPUT: 109542134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 10963deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_PENDING; 10975611a760SMatthias Ringwald sm_notify_client_base(SM_EVENT_PASSKEY_INPUT_NUMBER, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address); 10983deb3ec6SMatthias Ringwald } else { 1099c9b8fdd9SMatthias Ringwald sm_notify_client_passkey(SM_EVENT_PASSKEY_DISPLAY_NUMBER, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address, big_endian_read_32(setup->sm_tk, 12)); 11003deb3ec6SMatthias Ringwald } 11013deb3ec6SMatthias Ringwald break; 11023deb3ec6SMatthias Ringwald case PK_INIT_INPUT: 110342134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1104c9b8fdd9SMatthias Ringwald sm_notify_client_passkey(SM_EVENT_PASSKEY_DISPLAY_NUMBER, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address, big_endian_read_32(setup->sm_tk, 12)); 11053deb3ec6SMatthias Ringwald } else { 11063deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_PENDING; 11075611a760SMatthias Ringwald sm_notify_client_base(SM_EVENT_PASSKEY_INPUT_NUMBER, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address); 11083deb3ec6SMatthias Ringwald } 11093deb3ec6SMatthias Ringwald break; 11103deb3ec6SMatthias Ringwald case OK_BOTH_INPUT: 11113deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_PENDING; 11125611a760SMatthias Ringwald sm_notify_client_base(SM_EVENT_PASSKEY_INPUT_NUMBER, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address); 11133deb3ec6SMatthias Ringwald break; 111427c32905SMatthias Ringwald case NK_BOTH_INPUT: 1115446a8c36SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_PENDING; 1116c8c46d51SMatthias Ringwald sm_notify_client_passkey(SM_EVENT_NUMERIC_COMPARISON_REQUEST, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address, big_endian_read_32(setup->sm_tk, 12)); 111727c32905SMatthias Ringwald break; 11183deb3ec6SMatthias Ringwald case JUST_WORKS: 11193deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_PENDING; 11205611a760SMatthias Ringwald sm_notify_client_base(SM_EVENT_JUST_WORKS_REQUEST, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address); 11213deb3ec6SMatthias Ringwald break; 11223deb3ec6SMatthias Ringwald case OOB: 11233deb3ec6SMatthias Ringwald // client already provided OOB data, let's skip notification. 11243deb3ec6SMatthias Ringwald break; 11253deb3ec6SMatthias Ringwald } 11263deb3ec6SMatthias Ringwald } 11273deb3ec6SMatthias Ringwald 11283deb3ec6SMatthias Ringwald static int sm_key_distribution_all_received(sm_connection_t * sm_conn){ 11293deb3ec6SMatthias Ringwald int recv_flags; 113042134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 113152f9cf63SMatthias Ringwald // slave / responder 11321ad129beSMatthias Ringwald recv_flags = sm_key_distribution_flags_for_set(sm_pairing_packet_get_initiator_key_distribution(setup->sm_s_pres)); 11333deb3ec6SMatthias Ringwald } else { 11343deb3ec6SMatthias Ringwald // master / initiator 11351ad129beSMatthias Ringwald recv_flags = sm_key_distribution_flags_for_set(sm_pairing_packet_get_responder_key_distribution(setup->sm_s_pres)); 11363deb3ec6SMatthias Ringwald } 11373deb3ec6SMatthias Ringwald log_debug("sm_key_distribution_all_received: received 0x%02x, expecting 0x%02x", setup->sm_key_distribution_received_set, recv_flags); 11383deb3ec6SMatthias Ringwald return recv_flags == setup->sm_key_distribution_received_set; 11393deb3ec6SMatthias Ringwald } 11403deb3ec6SMatthias Ringwald 1141711e6c80SMatthias Ringwald static void sm_done_for_handle(hci_con_handle_t con_handle){ 11427149bde5SMatthias Ringwald if (sm_active_connection_handle == con_handle){ 11433deb3ec6SMatthias Ringwald sm_timeout_stop(); 11447149bde5SMatthias Ringwald sm_active_connection_handle = HCI_CON_HANDLE_INVALID; 1145711e6c80SMatthias Ringwald log_info("sm: connection 0x%x released setup context", con_handle); 11463deb3ec6SMatthias Ringwald } 11473deb3ec6SMatthias Ringwald } 11483deb3ec6SMatthias Ringwald 11493deb3ec6SMatthias Ringwald static int sm_key_distribution_flags_for_auth_req(void){ 11503deb3ec6SMatthias Ringwald int flags = SM_KEYDIST_ID_KEY | SM_KEYDIST_SIGN; 11513deb3ec6SMatthias Ringwald if (sm_auth_req & SM_AUTHREQ_BONDING){ 11523deb3ec6SMatthias Ringwald // encryption information only if bonding requested 11533deb3ec6SMatthias Ringwald flags |= SM_KEYDIST_ENC_KEY; 11543deb3ec6SMatthias Ringwald } 11553deb3ec6SMatthias Ringwald return flags; 11563deb3ec6SMatthias Ringwald } 11573deb3ec6SMatthias Ringwald 1158d7471931SMatthias Ringwald static void sm_reset_setup(void){ 11593deb3ec6SMatthias Ringwald // fill in sm setup 1160901c000fSMatthias Ringwald setup->sm_state_vars = 0; 11613d7fe1e9SMatthias Ringwald setup->sm_keypress_notification = 0xff; 11623deb3ec6SMatthias Ringwald sm_reset_tk(); 1163d7471931SMatthias Ringwald } 1164d7471931SMatthias Ringwald 1165d7471931SMatthias Ringwald static void sm_init_setup(sm_connection_t * sm_conn){ 1166d7471931SMatthias Ringwald 1167d7471931SMatthias Ringwald // fill in sm setup 11683deb3ec6SMatthias Ringwald setup->sm_peer_addr_type = sm_conn->sm_peer_addr_type; 11693deb3ec6SMatthias Ringwald memcpy(setup->sm_peer_address, sm_conn->sm_peer_address, 6); 11703deb3ec6SMatthias Ringwald 11713deb3ec6SMatthias Ringwald // query client for OOB data 11723deb3ec6SMatthias Ringwald int have_oob_data = 0; 11733deb3ec6SMatthias Ringwald if (sm_get_oob_data) { 11743deb3ec6SMatthias Ringwald have_oob_data = (*sm_get_oob_data)(sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address, setup->sm_tk); 11753deb3ec6SMatthias Ringwald } 11763deb3ec6SMatthias Ringwald 11773deb3ec6SMatthias Ringwald sm_pairing_packet_t * local_packet; 117842134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 11793deb3ec6SMatthias Ringwald // slave 11803deb3ec6SMatthias Ringwald local_packet = &setup->sm_s_pres; 1181b95a5a35SMatthias Ringwald gap_le_get_own_address(&setup->sm_s_addr_type, setup->sm_s_address); 11823deb3ec6SMatthias Ringwald setup->sm_m_addr_type = sm_conn->sm_peer_addr_type; 11833deb3ec6SMatthias Ringwald memcpy(setup->sm_m_address, sm_conn->sm_peer_address, 6); 11843deb3ec6SMatthias Ringwald } else { 11853deb3ec6SMatthias Ringwald // master 11863deb3ec6SMatthias Ringwald local_packet = &setup->sm_m_preq; 1187b95a5a35SMatthias Ringwald gap_le_get_own_address(&setup->sm_m_addr_type, setup->sm_m_address); 11883deb3ec6SMatthias Ringwald setup->sm_s_addr_type = sm_conn->sm_peer_addr_type; 11893deb3ec6SMatthias Ringwald memcpy(setup->sm_s_address, sm_conn->sm_peer_address, 6); 11903deb3ec6SMatthias Ringwald 11913deb3ec6SMatthias Ringwald int key_distribution_flags = sm_key_distribution_flags_for_auth_req(); 11921ad129beSMatthias Ringwald sm_pairing_packet_set_initiator_key_distribution(setup->sm_m_preq, key_distribution_flags); 11931ad129beSMatthias Ringwald sm_pairing_packet_set_responder_key_distribution(setup->sm_m_preq, key_distribution_flags); 11943deb3ec6SMatthias Ringwald } 11953deb3ec6SMatthias Ringwald 1196df86eb96SMatthias Ringwald uint8_t auth_req = sm_auth_req; 11971ad129beSMatthias Ringwald sm_pairing_packet_set_io_capability(*local_packet, sm_io_capabilities); 11981ad129beSMatthias Ringwald sm_pairing_packet_set_oob_data_flag(*local_packet, have_oob_data); 1199df86eb96SMatthias Ringwald sm_pairing_packet_set_auth_req(*local_packet, auth_req); 12001ad129beSMatthias Ringwald sm_pairing_packet_set_max_encryption_key_size(*local_packet, sm_max_encryption_key_size); 12013deb3ec6SMatthias Ringwald } 12023deb3ec6SMatthias Ringwald 12033deb3ec6SMatthias Ringwald static int sm_stk_generation_init(sm_connection_t * sm_conn){ 12043deb3ec6SMatthias Ringwald 12053deb3ec6SMatthias Ringwald sm_pairing_packet_t * remote_packet; 12063deb3ec6SMatthias Ringwald int remote_key_request; 120742134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 120852f9cf63SMatthias Ringwald // slave / responder 12093deb3ec6SMatthias Ringwald remote_packet = &setup->sm_m_preq; 12101ad129beSMatthias Ringwald remote_key_request = sm_pairing_packet_get_responder_key_distribution(setup->sm_m_preq); 12113deb3ec6SMatthias Ringwald } else { 12123deb3ec6SMatthias Ringwald // master / initiator 12133deb3ec6SMatthias Ringwald remote_packet = &setup->sm_s_pres; 12141ad129beSMatthias Ringwald remote_key_request = sm_pairing_packet_get_initiator_key_distribution(setup->sm_s_pres); 12153deb3ec6SMatthias Ringwald } 12163deb3ec6SMatthias Ringwald 12173deb3ec6SMatthias Ringwald // check key size 12181ad129beSMatthias Ringwald sm_conn->sm_actual_encryption_key_size = sm_calc_actual_encryption_key_size(sm_pairing_packet_get_max_encryption_key_size(*remote_packet)); 12193deb3ec6SMatthias Ringwald if (sm_conn->sm_actual_encryption_key_size == 0) return SM_REASON_ENCRYPTION_KEY_SIZE; 12203deb3ec6SMatthias Ringwald 12213deb3ec6SMatthias Ringwald // decide on STK generation method 12223deb3ec6SMatthias Ringwald sm_setup_tk(); 12233deb3ec6SMatthias Ringwald log_info("SMP: generation method %u", setup->sm_stk_generation_method); 12243deb3ec6SMatthias Ringwald 12253deb3ec6SMatthias Ringwald // check if STK generation method is acceptable by client 12263deb3ec6SMatthias Ringwald if (!sm_validate_stk_generation_method()) return SM_REASON_AUTHENTHICATION_REQUIREMENTS; 12273deb3ec6SMatthias Ringwald 122852f9cf63SMatthias Ringwald // identical to responder 122952f9cf63SMatthias Ringwald sm_setup_key_distribution(remote_key_request); 123052f9cf63SMatthias Ringwald 12313deb3ec6SMatthias Ringwald // JUST WORKS doens't provide authentication 12323deb3ec6SMatthias Ringwald sm_conn->sm_connection_authenticated = setup->sm_stk_generation_method == JUST_WORKS ? 0 : 1; 12333deb3ec6SMatthias Ringwald 12343deb3ec6SMatthias Ringwald return 0; 12353deb3ec6SMatthias Ringwald } 12363deb3ec6SMatthias Ringwald 12373deb3ec6SMatthias Ringwald static void sm_address_resolution_handle_event(address_resolution_event_t event){ 12383deb3ec6SMatthias Ringwald 12393deb3ec6SMatthias Ringwald // cache and reset context 12403deb3ec6SMatthias Ringwald int matched_device_id = sm_address_resolution_test; 12413deb3ec6SMatthias Ringwald address_resolution_mode_t mode = sm_address_resolution_mode; 12423deb3ec6SMatthias Ringwald void * context = sm_address_resolution_context; 12433deb3ec6SMatthias Ringwald 12443deb3ec6SMatthias Ringwald // reset context 12453deb3ec6SMatthias Ringwald sm_address_resolution_mode = ADDRESS_RESOLUTION_IDLE; 12463deb3ec6SMatthias Ringwald sm_address_resolution_context = NULL; 12473deb3ec6SMatthias Ringwald sm_address_resolution_test = -1; 1248711e6c80SMatthias Ringwald hci_con_handle_t con_handle = 0; 12493deb3ec6SMatthias Ringwald 12503deb3ec6SMatthias Ringwald sm_connection_t * sm_connection; 125142134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 1252d2e90122SMatthias Ringwald sm_key_t ltk; 125342134bc6SMatthias Ringwald #endif 12543deb3ec6SMatthias Ringwald switch (mode){ 12553deb3ec6SMatthias Ringwald case ADDRESS_RESOLUTION_GENERAL: 12563deb3ec6SMatthias Ringwald break; 12573deb3ec6SMatthias Ringwald case ADDRESS_RESOLUTION_FOR_CONNECTION: 12583deb3ec6SMatthias Ringwald sm_connection = (sm_connection_t *) context; 1259711e6c80SMatthias Ringwald con_handle = sm_connection->sm_handle; 12603deb3ec6SMatthias Ringwald switch (event){ 12613deb3ec6SMatthias Ringwald case ADDRESS_RESOLUTION_SUCEEDED: 12623deb3ec6SMatthias Ringwald sm_connection->sm_irk_lookup_state = IRK_LOOKUP_SUCCEEDED; 12633deb3ec6SMatthias Ringwald sm_connection->sm_le_db_index = matched_device_id; 12643deb3ec6SMatthias Ringwald log_info("ADDRESS_RESOLUTION_SUCEEDED, index %d", sm_connection->sm_le_db_index); 126542134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 12663deb3ec6SMatthias Ringwald if (sm_connection->sm_role) break; 12673deb3ec6SMatthias Ringwald if (!sm_connection->sm_bonding_requested && !sm_connection->sm_security_request_received) break; 12683deb3ec6SMatthias Ringwald sm_connection->sm_security_request_received = 0; 12693deb3ec6SMatthias Ringwald sm_connection->sm_bonding_requested = 0; 1270d2e90122SMatthias Ringwald le_device_db_encryption_get(sm_connection->sm_le_db_index, NULL, NULL, ltk, NULL, NULL, NULL); 1271d2e90122SMatthias Ringwald if (!sm_is_null_key(ltk)){ 12723deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_INITIATOR_PH0_HAS_LTK; 12733deb3ec6SMatthias Ringwald } else { 12743deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST; 12753deb3ec6SMatthias Ringwald } 127642134bc6SMatthias Ringwald #endif 12773deb3ec6SMatthias Ringwald break; 12783deb3ec6SMatthias Ringwald case ADDRESS_RESOLUTION_FAILED: 12793deb3ec6SMatthias Ringwald sm_connection->sm_irk_lookup_state = IRK_LOOKUP_FAILED; 128042134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 12813deb3ec6SMatthias Ringwald if (sm_connection->sm_role) break; 12823deb3ec6SMatthias Ringwald if (!sm_connection->sm_bonding_requested && !sm_connection->sm_security_request_received) break; 12833deb3ec6SMatthias Ringwald sm_connection->sm_security_request_received = 0; 12843deb3ec6SMatthias Ringwald sm_connection->sm_bonding_requested = 0; 12853deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST; 128642134bc6SMatthias Ringwald #endif 12873deb3ec6SMatthias Ringwald break; 12883deb3ec6SMatthias Ringwald } 12893deb3ec6SMatthias Ringwald break; 12903deb3ec6SMatthias Ringwald default: 12913deb3ec6SMatthias Ringwald break; 12923deb3ec6SMatthias Ringwald } 12933deb3ec6SMatthias Ringwald 12943deb3ec6SMatthias Ringwald switch (event){ 12953deb3ec6SMatthias Ringwald case ADDRESS_RESOLUTION_SUCEEDED: 1296711e6c80SMatthias Ringwald sm_notify_client_index(SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED, con_handle, sm_address_resolution_addr_type, sm_address_resolution_address, matched_device_id); 12973deb3ec6SMatthias Ringwald break; 12983deb3ec6SMatthias Ringwald case ADDRESS_RESOLUTION_FAILED: 1299711e6c80SMatthias Ringwald sm_notify_client_base(SM_EVENT_IDENTITY_RESOLVING_FAILED, con_handle, sm_address_resolution_addr_type, sm_address_resolution_address); 13003deb3ec6SMatthias Ringwald break; 13013deb3ec6SMatthias Ringwald } 13023deb3ec6SMatthias Ringwald } 13033deb3ec6SMatthias Ringwald 13043deb3ec6SMatthias Ringwald static void sm_key_distribution_handle_all_received(sm_connection_t * sm_conn){ 13053deb3ec6SMatthias Ringwald 13063deb3ec6SMatthias Ringwald int le_db_index = -1; 13073deb3ec6SMatthias Ringwald 13083deb3ec6SMatthias Ringwald // lookup device based on IRK 13093deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_IDENTITY_INFORMATION){ 13103deb3ec6SMatthias Ringwald int i; 13113deb3ec6SMatthias Ringwald for (i=0; i < le_device_db_count(); i++){ 13123deb3ec6SMatthias Ringwald sm_key_t irk; 13133deb3ec6SMatthias Ringwald bd_addr_t address; 13143deb3ec6SMatthias Ringwald int address_type; 13153deb3ec6SMatthias Ringwald le_device_db_info(i, &address_type, address, irk); 13163deb3ec6SMatthias Ringwald if (memcmp(irk, setup->sm_peer_irk, 16) == 0){ 13173deb3ec6SMatthias Ringwald log_info("sm: device found for IRK, updating"); 13183deb3ec6SMatthias Ringwald le_db_index = i; 13193deb3ec6SMatthias Ringwald break; 13203deb3ec6SMatthias Ringwald } 13213deb3ec6SMatthias Ringwald } 13223deb3ec6SMatthias Ringwald } 13233deb3ec6SMatthias Ringwald 13243deb3ec6SMatthias Ringwald // if not found, lookup via public address if possible 13253deb3ec6SMatthias Ringwald log_info("sm peer addr type %u, peer addres %s", setup->sm_peer_addr_type, bd_addr_to_str(setup->sm_peer_address)); 13263deb3ec6SMatthias Ringwald if (le_db_index < 0 && setup->sm_peer_addr_type == BD_ADDR_TYPE_LE_PUBLIC){ 13273deb3ec6SMatthias Ringwald int i; 13283deb3ec6SMatthias Ringwald for (i=0; i < le_device_db_count(); i++){ 13293deb3ec6SMatthias Ringwald bd_addr_t address; 13303deb3ec6SMatthias Ringwald int address_type; 13313deb3ec6SMatthias Ringwald le_device_db_info(i, &address_type, address, NULL); 13323deb3ec6SMatthias Ringwald log_info("device %u, sm peer addr type %u, peer addres %s", i, address_type, bd_addr_to_str(address)); 13333deb3ec6SMatthias Ringwald if (address_type == BD_ADDR_TYPE_LE_PUBLIC && memcmp(address, setup->sm_peer_address, 6) == 0){ 13343deb3ec6SMatthias Ringwald log_info("sm: device found for public address, updating"); 13353deb3ec6SMatthias Ringwald le_db_index = i; 13363deb3ec6SMatthias Ringwald break; 13373deb3ec6SMatthias Ringwald } 13383deb3ec6SMatthias Ringwald } 13393deb3ec6SMatthias Ringwald } 13403deb3ec6SMatthias Ringwald 13413deb3ec6SMatthias Ringwald // if not found, add to db 13423deb3ec6SMatthias Ringwald if (le_db_index < 0) { 13433deb3ec6SMatthias Ringwald le_db_index = le_device_db_add(setup->sm_peer_addr_type, setup->sm_peer_address, setup->sm_peer_irk); 13443deb3ec6SMatthias Ringwald } 13453deb3ec6SMatthias Ringwald 134613377825SMatthias Ringwald sm_notify_client_index(SM_EVENT_IDENTITY_CREATED, sm_conn->sm_handle, setup->sm_peer_addr_type, setup->sm_peer_address, le_db_index); 134713377825SMatthias Ringwald 13483deb3ec6SMatthias Ringwald if (le_db_index >= 0){ 13493deb3ec6SMatthias Ringwald 1350eda85fbfSMatthias Ringwald #ifdef ENABLE_LE_SIGNED_WRITE 13513deb3ec6SMatthias Ringwald // store local CSRK 13523deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set & SM_KEYDIST_FLAG_SIGNING_IDENTIFICATION){ 13533deb3ec6SMatthias Ringwald log_info("sm: store local CSRK"); 13543deb3ec6SMatthias Ringwald le_device_db_local_csrk_set(le_db_index, setup->sm_local_csrk); 13553deb3ec6SMatthias Ringwald le_device_db_local_counter_set(le_db_index, 0); 13563deb3ec6SMatthias Ringwald } 13573deb3ec6SMatthias Ringwald 13583deb3ec6SMatthias Ringwald // store remote CSRK 13593deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_SIGNING_IDENTIFICATION){ 13603deb3ec6SMatthias Ringwald log_info("sm: store remote CSRK"); 13613deb3ec6SMatthias Ringwald le_device_db_remote_csrk_set(le_db_index, setup->sm_peer_csrk); 13623deb3ec6SMatthias Ringwald le_device_db_remote_counter_set(le_db_index, 0); 13633deb3ec6SMatthias Ringwald } 1364eda85fbfSMatthias Ringwald #endif 136578f44163SMatthias Ringwald // store encryption information for secure connections: LTK generated by ECDH 136678f44163SMatthias Ringwald if (setup->sm_use_secure_connections){ 1367e6343eb6SMatthias Ringwald log_info("sm: store SC LTK (key size %u, authenticated %u)", sm_conn->sm_actual_encryption_key_size, sm_conn->sm_connection_authenticated); 136878f44163SMatthias Ringwald uint8_t zero_rand[8]; 136978f44163SMatthias Ringwald memset(zero_rand, 0, 8); 137078f44163SMatthias Ringwald le_device_db_encryption_set(le_db_index, 0, zero_rand, setup->sm_ltk, sm_conn->sm_actual_encryption_key_size, 137178f44163SMatthias Ringwald sm_conn->sm_connection_authenticated, sm_conn->sm_connection_authorization_state == AUTHORIZATION_GRANTED); 137278f44163SMatthias Ringwald } 137378f44163SMatthias Ringwald 1374e6343eb6SMatthias Ringwald // store encryption information for legacy pairing: peer LTK, EDIV, RAND 137578f44163SMatthias Ringwald else if ( (setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_ENCRYPTION_INFORMATION) 137678f44163SMatthias Ringwald && (setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_MASTER_IDENTIFICATION )){ 1377e6343eb6SMatthias Ringwald log_info("sm: set encryption information (key size %u, authenticated %u)", sm_conn->sm_actual_encryption_key_size, sm_conn->sm_connection_authenticated); 13783deb3ec6SMatthias Ringwald le_device_db_encryption_set(le_db_index, setup->sm_peer_ediv, setup->sm_peer_rand, setup->sm_peer_ltk, 13793deb3ec6SMatthias Ringwald sm_conn->sm_actual_encryption_key_size, sm_conn->sm_connection_authenticated, sm_conn->sm_connection_authorization_state == AUTHORIZATION_GRANTED); 138078f44163SMatthias Ringwald 13813deb3ec6SMatthias Ringwald } 13823deb3ec6SMatthias Ringwald } 13833deb3ec6SMatthias Ringwald 13843deb3ec6SMatthias Ringwald // keep le_db_index 13853deb3ec6SMatthias Ringwald sm_conn->sm_le_db_index = le_db_index; 13863deb3ec6SMatthias Ringwald } 13873deb3ec6SMatthias Ringwald 1388688a08f9SMatthias Ringwald static void sm_pairing_error(sm_connection_t * sm_conn, uint8_t reason){ 1389688a08f9SMatthias Ringwald setup->sm_pairing_failed_reason = reason; 1390688a08f9SMatthias Ringwald sm_conn->sm_engine_state = SM_GENERAL_SEND_PAIRING_FAILED; 1391688a08f9SMatthias Ringwald } 1392688a08f9SMatthias Ringwald 1393688a08f9SMatthias Ringwald static inline void sm_pdu_received_in_wrong_state(sm_connection_t * sm_conn){ 1394688a08f9SMatthias Ringwald sm_pairing_error(sm_conn, SM_REASON_UNSPECIFIED_REASON); 1395688a08f9SMatthias Ringwald } 1396688a08f9SMatthias Ringwald 13979af0f475SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 1398688a08f9SMatthias Ringwald 1399dc300847SMatthias Ringwald static void sm_sc_prepare_dhkey_check(sm_connection_t * sm_conn); 1400945888f5SMatthias Ringwald static int sm_passkey_used(stk_generation_method_t method); 1401f1c1783eSMatthias Ringwald static int sm_just_works_or_numeric_comparison(stk_generation_method_t method); 1402dc300847SMatthias Ringwald 140368437d83SMatthias Ringwald static void sm_log_ec_keypair(void){ 14042e6217a0SMatthias Ringwald log_info("Elliptic curve: X"); 1405fc5bff5fSMatthias Ringwald log_info_hexdump(&ec_q[0],32); 14062e6217a0SMatthias Ringwald log_info("Elliptic curve: Y"); 1407fc5bff5fSMatthias Ringwald log_info_hexdump(&ec_q[32],32); 140868437d83SMatthias Ringwald } 140968437d83SMatthias Ringwald 1410b35a3de2SMatthias Ringwald static void sm_sc_start_calculating_local_confirm(sm_connection_t * sm_conn){ 1411b35a3de2SMatthias Ringwald if (sm_passkey_used(setup->sm_stk_generation_method)){ 1412b35a3de2SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_GET_RANDOM_A; 1413b35a3de2SMatthias Ringwald } else { 14141f9d84e9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CMAC_FOR_CONFIRMATION; 1415b35a3de2SMatthias Ringwald } 1416b35a3de2SMatthias Ringwald } 1417b35a3de2SMatthias Ringwald 1418688a08f9SMatthias Ringwald static void sm_sc_state_after_receiving_random(sm_connection_t * sm_conn){ 141942134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1420688a08f9SMatthias Ringwald // Responder 1421688a08f9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_PAIRING_RANDOM; 1422688a08f9SMatthias Ringwald } else { 1423688a08f9SMatthias Ringwald // Initiator role 1424688a08f9SMatthias Ringwald switch (setup->sm_stk_generation_method){ 1425688a08f9SMatthias Ringwald case JUST_WORKS: 1426dc300847SMatthias Ringwald sm_sc_prepare_dhkey_check(sm_conn); 1427688a08f9SMatthias Ringwald break; 1428688a08f9SMatthias Ringwald 1429f92edc8eSMatthias Ringwald case NK_BOTH_INPUT: 1430bd57ffebSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_G2; 1431688a08f9SMatthias Ringwald break; 1432688a08f9SMatthias Ringwald case PK_INIT_INPUT: 1433688a08f9SMatthias Ringwald case PK_RESP_INPUT: 1434688a08f9SMatthias Ringwald case OK_BOTH_INPUT: 1435688a08f9SMatthias Ringwald if (setup->sm_passkey_bit < 20) { 1436b35a3de2SMatthias Ringwald sm_sc_start_calculating_local_confirm(sm_conn); 1437688a08f9SMatthias Ringwald } else { 1438dc300847SMatthias Ringwald sm_sc_prepare_dhkey_check(sm_conn); 1439688a08f9SMatthias Ringwald } 1440688a08f9SMatthias Ringwald break; 1441688a08f9SMatthias Ringwald case OOB: 1442688a08f9SMatthias Ringwald // TODO: implement SC OOB 1443688a08f9SMatthias Ringwald break; 1444688a08f9SMatthias Ringwald } 1445688a08f9SMatthias Ringwald } 1446688a08f9SMatthias Ringwald } 1447688a08f9SMatthias Ringwald 1448aec94140SMatthias Ringwald static uint8_t sm_sc_cmac_get_byte(uint16_t offset){ 1449aec94140SMatthias Ringwald return sm_cmac_sc_buffer[offset]; 1450aec94140SMatthias Ringwald } 1451688a08f9SMatthias Ringwald 1452aec94140SMatthias Ringwald static void sm_sc_cmac_done(uint8_t * hash){ 1453688a08f9SMatthias Ringwald log_info("sm_sc_cmac_done: "); 1454688a08f9SMatthias Ringwald log_info_hexdump(hash, 16); 1455688a08f9SMatthias Ringwald 1456bd57ffebSMatthias Ringwald sm_connection_t * sm_conn = sm_cmac_connection; 1457bd57ffebSMatthias Ringwald sm_cmac_connection = NULL; 14582bacf595SMatthias Ringwald link_key_type_t link_key_type; 1459bd57ffebSMatthias Ringwald 1460bd57ffebSMatthias Ringwald switch (sm_conn->sm_engine_state){ 1461aec94140SMatthias Ringwald case SM_SC_W4_CMAC_FOR_CONFIRMATION: 1462aec94140SMatthias Ringwald memcpy(setup->sm_local_confirm, hash, 16); 1463bd57ffebSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_CONFIRMATION; 1464aec94140SMatthias Ringwald break; 1465688a08f9SMatthias Ringwald case SM_SC_W4_CMAC_FOR_CHECK_CONFIRMATION: 1466688a08f9SMatthias Ringwald // check 1467688a08f9SMatthias Ringwald if (0 != memcmp(hash, setup->sm_peer_confirm, 16)){ 1468bd57ffebSMatthias Ringwald sm_pairing_error(sm_conn, SM_REASON_CONFIRM_VALUE_FAILED); 1469688a08f9SMatthias Ringwald break; 1470688a08f9SMatthias Ringwald } 1471bd57ffebSMatthias Ringwald sm_sc_state_after_receiving_random(sm_conn); 1472688a08f9SMatthias Ringwald break; 1473901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_G2: { 1474901c000fSMatthias Ringwald uint32_t vab = big_endian_read_32(hash, 12) % 1000000; 1475901c000fSMatthias Ringwald big_endian_store_32(setup->sm_tk, 12, vab); 1476901c000fSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W4_USER_RESPONSE; 1477901c000fSMatthias Ringwald sm_trigger_user_response(sm_conn); 1478019005a0SMatthias Ringwald break; 1479019005a0SMatthias Ringwald } 14800346c37cSMatthias Ringwald case SM_SC_W4_CALCULATE_F5_SALT: 14810346c37cSMatthias Ringwald memcpy(setup->sm_t, hash, 16); 1482bd57ffebSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_F5_MACKEY; 14830346c37cSMatthias Ringwald break; 14840346c37cSMatthias Ringwald case SM_SC_W4_CALCULATE_F5_MACKEY: 14850346c37cSMatthias Ringwald memcpy(setup->sm_mackey, hash, 16); 1486bd57ffebSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_F5_LTK; 14870346c37cSMatthias Ringwald break; 14880346c37cSMatthias Ringwald case SM_SC_W4_CALCULATE_F5_LTK: 1489b18300a6SMatthias Ringwald // truncate sm_ltk, but keep full LTK for cross-transport key derivation in sm_local_ltk 1490b18300a6SMatthias Ringwald // Errata Service Release to the Bluetooth Specification: ESR09 1491b18300a6SMatthias Ringwald // E6405 – Cross transport key derivation from a key of size less than 128 bits 1492b18300a6SMatthias Ringwald // Note: When the BR/EDR link key is being derived from the LTK, the derivation is done before the LTK gets masked." 14930346c37cSMatthias Ringwald memcpy(setup->sm_ltk, hash, 16); 1494aa7d4d9cSMatthias Ringwald memcpy(setup->sm_local_ltk, hash, 16); 1495893e9333SMatthias Ringwald sm_truncate_key(setup->sm_ltk, sm_conn->sm_actual_encryption_key_size); 1496bd57ffebSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_F6_FOR_DHKEY_CHECK; 1497019005a0SMatthias Ringwald break; 1498901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_F6_FOR_DHKEY_CHECK: 1499901c000fSMatthias Ringwald memcpy(setup->sm_local_dhkey_check, hash, 16); 150042134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1501901c000fSMatthias Ringwald // responder 1502901c000fSMatthias Ringwald if (setup->sm_state_vars & SM_STATE_VAR_DHKEY_COMMAND_RECEIVED){ 1503901c000fSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_F6_TO_VERIFY_DHKEY_CHECK; 1504901c000fSMatthias Ringwald } else { 1505901c000fSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W4_DHKEY_CHECK_COMMAND; 1506901c000fSMatthias Ringwald } 1507901c000fSMatthias Ringwald } else { 1508901c000fSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_DHKEY_CHECK_COMMAND; 1509901c000fSMatthias Ringwald } 1510901c000fSMatthias Ringwald break; 1511901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_F6_TO_VERIFY_DHKEY_CHECK: 1512901c000fSMatthias Ringwald if (0 != memcmp(hash, setup->sm_peer_dhkey_check, 16) ){ 1513901c000fSMatthias Ringwald sm_pairing_error(sm_conn, SM_REASON_DHKEY_CHECK_FAILED); 1514aec94140SMatthias Ringwald break; 1515aec94140SMatthias Ringwald } 151642134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1517901c000fSMatthias Ringwald // responder 1518901c000fSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_DHKEY_CHECK_COMMAND; 1519901c000fSMatthias Ringwald } else { 1520901c000fSMatthias Ringwald // initiator 1521901c000fSMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH3_SEND_START_ENCRYPTION; 1522bd57ffebSMatthias Ringwald } 1523901c000fSMatthias Ringwald break; 15242bacf595SMatthias Ringwald case SM_SC_W4_CALCULATE_H6_ILK: 15252bacf595SMatthias Ringwald memcpy(setup->sm_t, hash, 16); 15262bacf595SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_H6_BR_EDR_LINK_KEY; 15272bacf595SMatthias Ringwald break; 15282bacf595SMatthias Ringwald case SM_SC_W4_CALCULATE_H6_BR_EDR_LINK_KEY: 15298974e43fSMatthias Ringwald #ifdef ENABLE_CLASSIC 15302bacf595SMatthias Ringwald reverse_128(hash, setup->sm_t); 15312bacf595SMatthias Ringwald link_key_type = sm_conn->sm_connection_authenticated ? 15322bacf595SMatthias Ringwald AUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256 : UNAUTHENTICATED_COMBINATION_KEY_GENERATED_FROM_P256; 15338974e43fSMatthias Ringwald log_info("Derived classic link key from LE using h6, type %u", (int) link_key_type); 153442134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 15352bacf595SMatthias Ringwald gap_store_link_key_for_bd_addr(setup->sm_m_address, setup->sm_t, link_key_type); 15368974e43fSMatthias Ringwald } else { 15378974e43fSMatthias Ringwald gap_store_link_key_for_bd_addr(setup->sm_s_address, setup->sm_t, link_key_type); 15388974e43fSMatthias Ringwald } 153935454696SMatthias Ringwald #endif 15408974e43fSMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 15412bacf595SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_IDLE; 15422bacf595SMatthias Ringwald } else { 15432bacf595SMatthias Ringwald gap_store_link_key_for_bd_addr(setup->sm_s_address, setup->sm_t, link_key_type); 15442bacf595SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_CONNECTED; 15452bacf595SMatthias Ringwald } 15462bacf595SMatthias Ringwald sm_done_for_handle(sm_conn->sm_handle); 15472bacf595SMatthias Ringwald break; 1548bd57ffebSMatthias Ringwald default: 1549bd57ffebSMatthias Ringwald log_error("sm_sc_cmac_done in state %u", sm_conn->sm_engine_state); 1550bd57ffebSMatthias Ringwald break; 1551bd57ffebSMatthias Ringwald } 1552aec94140SMatthias Ringwald sm_run(); 1553aec94140SMatthias Ringwald } 1554aec94140SMatthias Ringwald 1555688a08f9SMatthias Ringwald static void f4_engine(sm_connection_t * sm_conn, const sm_key256_t u, const sm_key256_t v, const sm_key_t x, uint8_t z){ 1556dc300847SMatthias Ringwald const uint16_t message_len = 65; 1557aec94140SMatthias Ringwald sm_cmac_connection = sm_conn; 1558aec94140SMatthias Ringwald memcpy(sm_cmac_sc_buffer, u, 32); 1559aec94140SMatthias Ringwald memcpy(sm_cmac_sc_buffer+32, v, 32); 1560aec94140SMatthias Ringwald sm_cmac_sc_buffer[64] = z; 1561aec94140SMatthias Ringwald log_info("f4 key"); 1562aec94140SMatthias Ringwald log_info_hexdump(x, 16); 1563aec94140SMatthias Ringwald log_info("f4 message"); 1564dc300847SMatthias Ringwald log_info_hexdump(sm_cmac_sc_buffer, message_len); 1565dc300847SMatthias Ringwald sm_cmac_general_start(x, message_len, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 1566aec94140SMatthias Ringwald } 1567aec94140SMatthias Ringwald 15680346c37cSMatthias Ringwald static const sm_key_t f5_salt = { 0x6C ,0x88, 0x83, 0x91, 0xAA, 0xF5, 0xA5, 0x38, 0x60, 0x37, 0x0B, 0xDB, 0x5A, 0x60, 0x83, 0xBE}; 15690346c37cSMatthias Ringwald static const uint8_t f5_key_id[] = { 0x62, 0x74, 0x6c, 0x65 }; 15700346c37cSMatthias Ringwald static const uint8_t f5_length[] = { 0x01, 0x00}; 15710346c37cSMatthias Ringwald 15720346c37cSMatthias Ringwald static void sm_sc_calculate_dhkey(sm_key256_t dhkey){ 15734b8ec5bcSMatthias Ringwald memset(dhkey, 0, 32); 1574c692d776SMatthias Ringwald #ifdef USE_MICROECC_FOR_ECDH 15754b8ec5bcSMatthias Ringwald #if uECC_SUPPORTS_secp256r1 15764b8ec5bcSMatthias Ringwald // standard version 15774b8ec5bcSMatthias Ringwald uECC_shared_secret(setup->sm_peer_q, ec_d, dhkey, uECC_secp256r1()); 15784b8ec5bcSMatthias Ringwald #else 15794b8ec5bcSMatthias Ringwald // static version 1580c692d776SMatthias Ringwald uECC_shared_secret(setup->sm_peer_q, ec_d, dhkey); 1581c692d776SMatthias Ringwald #endif 15824b8ec5bcSMatthias Ringwald #endif 15830346c37cSMatthias Ringwald log_info("dhkey"); 15840346c37cSMatthias Ringwald log_info_hexdump(dhkey, 32); 15850346c37cSMatthias Ringwald } 15860346c37cSMatthias Ringwald 15870346c37cSMatthias Ringwald static void f5_calculate_salt(sm_connection_t * sm_conn){ 15880346c37cSMatthias Ringwald // calculate DHKEY 15890346c37cSMatthias Ringwald sm_key256_t dhkey; 15900346c37cSMatthias Ringwald sm_sc_calculate_dhkey(dhkey); 15910346c37cSMatthias Ringwald 15920346c37cSMatthias Ringwald // calculate salt for f5 15930346c37cSMatthias Ringwald const uint16_t message_len = 32; 15940346c37cSMatthias Ringwald sm_cmac_connection = sm_conn; 15950346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer, dhkey, message_len); 15960346c37cSMatthias Ringwald sm_cmac_general_start(f5_salt, message_len, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 15970346c37cSMatthias Ringwald } 15980346c37cSMatthias Ringwald 15990346c37cSMatthias Ringwald static inline void f5_mackkey(sm_connection_t * sm_conn, sm_key_t t, const sm_key_t n1, const sm_key_t n2, const sm_key56_t a1, const sm_key56_t a2){ 16000346c37cSMatthias Ringwald const uint16_t message_len = 53; 16010346c37cSMatthias Ringwald sm_cmac_connection = sm_conn; 16020346c37cSMatthias Ringwald 16030346c37cSMatthias Ringwald // f5(W, N1, N2, A1, A2) = AES-CMACT (Counter = 0 || keyID || N1 || N2|| A1|| A2 || Length = 256) -- this is the MacKey 16040346c37cSMatthias Ringwald sm_cmac_sc_buffer[0] = 0; 16050346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer+01, f5_key_id, 4); 16060346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer+05, n1, 16); 16070346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer+21, n2, 16); 16080346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer+37, a1, 7); 16090346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer+44, a2, 7); 16100346c37cSMatthias Ringwald memcpy(sm_cmac_sc_buffer+51, f5_length, 2); 16110346c37cSMatthias Ringwald log_info("f5 key"); 16120346c37cSMatthias Ringwald log_info_hexdump(t, 16); 16130346c37cSMatthias Ringwald log_info("f5 message for MacKey"); 16140346c37cSMatthias Ringwald log_info_hexdump(sm_cmac_sc_buffer, message_len); 16150346c37cSMatthias Ringwald sm_cmac_general_start(t, message_len, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 16160346c37cSMatthias Ringwald } 16170346c37cSMatthias Ringwald 16180346c37cSMatthias Ringwald static void f5_calculate_mackey(sm_connection_t * sm_conn){ 16190346c37cSMatthias Ringwald sm_key56_t bd_addr_master, bd_addr_slave; 16200346c37cSMatthias Ringwald bd_addr_master[0] = setup->sm_m_addr_type; 16210346c37cSMatthias Ringwald bd_addr_slave[0] = setup->sm_s_addr_type; 16220346c37cSMatthias Ringwald memcpy(&bd_addr_master[1], setup->sm_m_address, 6); 16230346c37cSMatthias Ringwald memcpy(&bd_addr_slave[1], setup->sm_s_address, 6); 162442134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 16250346c37cSMatthias Ringwald // responder 16260346c37cSMatthias Ringwald f5_mackkey(sm_conn, setup->sm_t, setup->sm_peer_nonce, setup->sm_local_nonce, bd_addr_master, bd_addr_slave); 16270346c37cSMatthias Ringwald } else { 16280346c37cSMatthias Ringwald // initiator 16290346c37cSMatthias Ringwald f5_mackkey(sm_conn, setup->sm_t, setup->sm_local_nonce, setup->sm_peer_nonce, bd_addr_master, bd_addr_slave); 16300346c37cSMatthias Ringwald } 16310346c37cSMatthias Ringwald } 16320346c37cSMatthias Ringwald 16330346c37cSMatthias Ringwald // note: must be called right after f5_mackey, as sm_cmac_buffer[1..52] will be reused 16340346c37cSMatthias Ringwald static inline void f5_ltk(sm_connection_t * sm_conn, sm_key_t t){ 16350346c37cSMatthias Ringwald const uint16_t message_len = 53; 16360346c37cSMatthias Ringwald sm_cmac_connection = sm_conn; 16370346c37cSMatthias Ringwald sm_cmac_sc_buffer[0] = 1; 16380346c37cSMatthias Ringwald // 1..52 setup before 16390346c37cSMatthias Ringwald log_info("f5 key"); 16400346c37cSMatthias Ringwald log_info_hexdump(t, 16); 16410346c37cSMatthias Ringwald log_info("f5 message for LTK"); 16420346c37cSMatthias Ringwald log_info_hexdump(sm_cmac_sc_buffer, message_len); 16430346c37cSMatthias Ringwald sm_cmac_general_start(t, message_len, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 16440346c37cSMatthias Ringwald } 1645f92edc8eSMatthias Ringwald 16460346c37cSMatthias Ringwald static void f5_calculate_ltk(sm_connection_t * sm_conn){ 16470346c37cSMatthias Ringwald f5_ltk(sm_conn, setup->sm_t); 16480346c37cSMatthias Ringwald } 16490346c37cSMatthias Ringwald 165027163002SMatthias Ringwald static void f6_engine(sm_connection_t * sm_conn, const sm_key_t w, const sm_key_t n1, const sm_key_t n2, const sm_key_t r, const sm_key24_t io_cap, const sm_key56_t a1, const sm_key56_t a2){ 1651dc300847SMatthias Ringwald const uint16_t message_len = 65; 165227163002SMatthias Ringwald sm_cmac_connection = sm_conn; 1653dc300847SMatthias Ringwald memcpy(sm_cmac_sc_buffer, n1, 16); 1654dc300847SMatthias Ringwald memcpy(sm_cmac_sc_buffer+16, n2, 16); 1655dc300847SMatthias Ringwald memcpy(sm_cmac_sc_buffer+32, r, 16); 1656dc300847SMatthias Ringwald memcpy(sm_cmac_sc_buffer+48, io_cap, 3); 1657dc300847SMatthias Ringwald memcpy(sm_cmac_sc_buffer+51, a1, 7); 1658dc300847SMatthias Ringwald memcpy(sm_cmac_sc_buffer+58, a2, 7); 1659dc300847SMatthias Ringwald log_info("f6 key"); 1660dc300847SMatthias Ringwald log_info_hexdump(w, 16); 1661dc300847SMatthias Ringwald log_info("f6 message"); 1662dc300847SMatthias Ringwald log_info_hexdump(sm_cmac_sc_buffer, message_len); 1663dc300847SMatthias Ringwald sm_cmac_general_start(w, 65, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 1664dc300847SMatthias Ringwald } 1665dc300847SMatthias Ringwald 1666f92edc8eSMatthias Ringwald // g2(U, V, X, Y) = AES-CMACX(U || V || Y) mod 2^32 1667f92edc8eSMatthias Ringwald // - U is 256 bits 1668f92edc8eSMatthias Ringwald // - V is 256 bits 1669f92edc8eSMatthias Ringwald // - X is 128 bits 1670f92edc8eSMatthias Ringwald // - Y is 128 bits 1671bd57ffebSMatthias Ringwald static void g2_engine(sm_connection_t * sm_conn, const sm_key256_t u, const sm_key256_t v, const sm_key_t x, const sm_key_t y){ 1672bd57ffebSMatthias Ringwald const uint16_t message_len = 80; 1673bd57ffebSMatthias Ringwald sm_cmac_connection = sm_conn; 1674bd57ffebSMatthias Ringwald memcpy(sm_cmac_sc_buffer, u, 32); 1675bd57ffebSMatthias Ringwald memcpy(sm_cmac_sc_buffer+32, v, 32); 1676bd57ffebSMatthias Ringwald memcpy(sm_cmac_sc_buffer+64, y, 16); 1677f92edc8eSMatthias Ringwald log_info("g2 key"); 1678f92edc8eSMatthias Ringwald log_info_hexdump(x, 16); 1679f92edc8eSMatthias Ringwald log_info("g2 message"); 16802bacf595SMatthias Ringwald log_info_hexdump(sm_cmac_sc_buffer, message_len); 1681bd57ffebSMatthias Ringwald sm_cmac_general_start(x, message_len, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 1682f92edc8eSMatthias Ringwald } 1683f92edc8eSMatthias Ringwald 1684b35a3de2SMatthias Ringwald static void g2_calculate(sm_connection_t * sm_conn) { 1685f92edc8eSMatthias Ringwald // calc Va if numeric comparison 168642134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1687f92edc8eSMatthias Ringwald // responder 1688fc5bff5fSMatthias Ringwald g2_engine(sm_conn, setup->sm_peer_q, ec_q, setup->sm_peer_nonce, setup->sm_local_nonce);; 1689f92edc8eSMatthias Ringwald } else { 1690f92edc8eSMatthias Ringwald // initiator 1691fc5bff5fSMatthias Ringwald g2_engine(sm_conn, ec_q, setup->sm_peer_q, setup->sm_local_nonce, setup->sm_peer_nonce); 1692f92edc8eSMatthias Ringwald } 1693f92edc8eSMatthias Ringwald } 1694f92edc8eSMatthias Ringwald 1695945888f5SMatthias Ringwald static void sm_sc_calculate_local_confirm(sm_connection_t * sm_conn){ 16969af0f475SMatthias Ringwald uint8_t z = 0; 16979af0f475SMatthias Ringwald if (setup->sm_stk_generation_method != JUST_WORKS && setup->sm_stk_generation_method != NK_BOTH_INPUT){ 16989af0f475SMatthias Ringwald // some form of passkey 16999af0f475SMatthias Ringwald uint32_t pk = big_endian_read_32(setup->sm_tk, 12); 17009af0f475SMatthias Ringwald z = 0x80 | ((pk >> setup->sm_passkey_bit) & 1); 17019af0f475SMatthias Ringwald setup->sm_passkey_bit++; 17029af0f475SMatthias Ringwald } 1703fc5bff5fSMatthias Ringwald f4_engine(sm_conn, ec_q, setup->sm_peer_q, setup->sm_local_nonce, z); 17049af0f475SMatthias Ringwald } 1705688a08f9SMatthias Ringwald 1706688a08f9SMatthias Ringwald static void sm_sc_calculate_remote_confirm(sm_connection_t * sm_conn){ 1707688a08f9SMatthias Ringwald uint8_t z = 0; 1708688a08f9SMatthias Ringwald if (setup->sm_stk_generation_method != JUST_WORKS && setup->sm_stk_generation_method != NK_BOTH_INPUT){ 1709688a08f9SMatthias Ringwald // some form of passkey 1710688a08f9SMatthias Ringwald uint32_t pk = big_endian_read_32(setup->sm_tk, 12); 1711688a08f9SMatthias Ringwald // sm_passkey_bit was increased before sending confirm value 1712688a08f9SMatthias Ringwald z = 0x80 | ((pk >> (setup->sm_passkey_bit-1)) & 1); 1713688a08f9SMatthias Ringwald } 1714fc5bff5fSMatthias Ringwald f4_engine(sm_conn, setup->sm_peer_q, ec_q, setup->sm_peer_nonce, z); 1715688a08f9SMatthias Ringwald } 1716688a08f9SMatthias Ringwald 17170346c37cSMatthias Ringwald static void sm_sc_prepare_dhkey_check(sm_connection_t * sm_conn){ 17180346c37cSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_F5_SALT; 1719dc300847SMatthias Ringwald } 1720dc300847SMatthias Ringwald 1721dc300847SMatthias Ringwald static void sm_sc_calculate_f6_for_dhkey_check(sm_connection_t * sm_conn){ 1722dc300847SMatthias Ringwald // calculate DHKCheck 1723dc300847SMatthias Ringwald sm_key56_t bd_addr_master, bd_addr_slave; 1724dc300847SMatthias Ringwald bd_addr_master[0] = setup->sm_m_addr_type; 1725dc300847SMatthias Ringwald bd_addr_slave[0] = setup->sm_s_addr_type; 1726dc300847SMatthias Ringwald memcpy(&bd_addr_master[1], setup->sm_m_address, 6); 1727dc300847SMatthias Ringwald memcpy(&bd_addr_slave[1], setup->sm_s_address, 6); 1728dc300847SMatthias Ringwald uint8_t iocap_a[3]; 1729dc300847SMatthias Ringwald iocap_a[0] = sm_pairing_packet_get_auth_req(setup->sm_m_preq); 1730dc300847SMatthias Ringwald iocap_a[1] = sm_pairing_packet_get_oob_data_flag(setup->sm_m_preq); 1731dc300847SMatthias Ringwald iocap_a[2] = sm_pairing_packet_get_io_capability(setup->sm_m_preq); 1732dc300847SMatthias Ringwald uint8_t iocap_b[3]; 1733dc300847SMatthias Ringwald iocap_b[0] = sm_pairing_packet_get_auth_req(setup->sm_s_pres); 1734dc300847SMatthias Ringwald iocap_b[1] = sm_pairing_packet_get_oob_data_flag(setup->sm_s_pres); 1735dc300847SMatthias Ringwald iocap_b[2] = sm_pairing_packet_get_io_capability(setup->sm_s_pres); 173642134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1737dc300847SMatthias Ringwald // responder 173827163002SMatthias Ringwald f6_engine(sm_conn, setup->sm_mackey, setup->sm_local_nonce, setup->sm_peer_nonce, setup->sm_ra, iocap_b, bd_addr_slave, bd_addr_master); 1739dc300847SMatthias Ringwald } else { 1740dc300847SMatthias Ringwald // initiator 174127163002SMatthias Ringwald f6_engine(sm_conn, setup->sm_mackey, setup->sm_local_nonce, setup->sm_peer_nonce, setup->sm_rb, iocap_a, bd_addr_master, bd_addr_slave); 1742dc300847SMatthias Ringwald } 1743dc300847SMatthias Ringwald } 1744dc300847SMatthias Ringwald 1745019005a0SMatthias Ringwald static void sm_sc_calculate_f6_to_verify_dhkey_check(sm_connection_t * sm_conn){ 1746019005a0SMatthias Ringwald // validate E = f6() 1747019005a0SMatthias Ringwald sm_key56_t bd_addr_master, bd_addr_slave; 1748019005a0SMatthias Ringwald bd_addr_master[0] = setup->sm_m_addr_type; 1749019005a0SMatthias Ringwald bd_addr_slave[0] = setup->sm_s_addr_type; 1750019005a0SMatthias Ringwald memcpy(&bd_addr_master[1], setup->sm_m_address, 6); 1751019005a0SMatthias Ringwald memcpy(&bd_addr_slave[1], setup->sm_s_address, 6); 1752019005a0SMatthias Ringwald 1753019005a0SMatthias Ringwald uint8_t iocap_a[3]; 1754019005a0SMatthias Ringwald iocap_a[0] = sm_pairing_packet_get_auth_req(setup->sm_m_preq); 1755019005a0SMatthias Ringwald iocap_a[1] = sm_pairing_packet_get_oob_data_flag(setup->sm_m_preq); 1756019005a0SMatthias Ringwald iocap_a[2] = sm_pairing_packet_get_io_capability(setup->sm_m_preq); 1757019005a0SMatthias Ringwald uint8_t iocap_b[3]; 1758019005a0SMatthias Ringwald iocap_b[0] = sm_pairing_packet_get_auth_req(setup->sm_s_pres); 1759019005a0SMatthias Ringwald iocap_b[1] = sm_pairing_packet_get_oob_data_flag(setup->sm_s_pres); 1760019005a0SMatthias Ringwald iocap_b[2] = sm_pairing_packet_get_io_capability(setup->sm_s_pres); 176142134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 1762019005a0SMatthias Ringwald // responder 1763019005a0SMatthias Ringwald f6_engine(sm_conn, setup->sm_mackey, setup->sm_peer_nonce, setup->sm_local_nonce, setup->sm_rb, iocap_a, bd_addr_master, bd_addr_slave); 1764019005a0SMatthias Ringwald } else { 1765019005a0SMatthias Ringwald // initiator 1766019005a0SMatthias Ringwald f6_engine(sm_conn, setup->sm_mackey, setup->sm_peer_nonce, setup->sm_local_nonce, setup->sm_ra, iocap_b, bd_addr_slave, bd_addr_master); 1767019005a0SMatthias Ringwald } 1768019005a0SMatthias Ringwald } 17692bacf595SMatthias Ringwald 17702bacf595SMatthias Ringwald 17712bacf595SMatthias Ringwald // 17722bacf595SMatthias Ringwald // Link Key Conversion Function h6 17732bacf595SMatthias Ringwald // 17742bacf595SMatthias Ringwald // h6(W, keyID) = AES-CMACW(keyID) 17752bacf595SMatthias Ringwald // - W is 128 bits 17762bacf595SMatthias Ringwald // - keyID is 32 bits 17772bacf595SMatthias Ringwald static void h6_engine(sm_connection_t * sm_conn, const sm_key_t w, const uint32_t key_id){ 17782bacf595SMatthias Ringwald const uint16_t message_len = 4; 17792bacf595SMatthias Ringwald sm_cmac_connection = sm_conn; 17802bacf595SMatthias Ringwald big_endian_store_32(sm_cmac_sc_buffer, 0, key_id); 17812bacf595SMatthias Ringwald log_info("h6 key"); 17822bacf595SMatthias Ringwald log_info_hexdump(w, 16); 17832bacf595SMatthias Ringwald log_info("h6 message"); 17842bacf595SMatthias Ringwald log_info_hexdump(sm_cmac_sc_buffer, message_len); 17852bacf595SMatthias Ringwald sm_cmac_general_start(w, message_len, &sm_sc_cmac_get_byte, &sm_sc_cmac_done); 17862bacf595SMatthias Ringwald } 17872bacf595SMatthias Ringwald 1788b18300a6SMatthias Ringwald // For SC, setup->sm_local_ltk holds full LTK (sm_ltk is already truncated) 1789b18300a6SMatthias Ringwald // Errata Service Release to the Bluetooth Specification: ESR09 1790b18300a6SMatthias Ringwald // E6405 – Cross transport key derivation from a key of size less than 128 bits 1791b18300a6SMatthias Ringwald // "Note: When the BR/EDR link key is being derived from the LTK, the derivation is done before the LTK gets masked." 17922bacf595SMatthias Ringwald static void h6_calculate_ilk(sm_connection_t * sm_conn){ 1793b18300a6SMatthias Ringwald h6_engine(sm_conn, setup->sm_local_ltk, 0x746D7031); // "tmp1" 17942bacf595SMatthias Ringwald } 17952bacf595SMatthias Ringwald 17962bacf595SMatthias Ringwald static void h6_calculate_br_edr_link_key(sm_connection_t * sm_conn){ 17972bacf595SMatthias Ringwald h6_engine(sm_conn, setup->sm_t, 0x6c656272); // "lebr" 17982bacf595SMatthias Ringwald } 17992bacf595SMatthias Ringwald 18009af0f475SMatthias Ringwald #endif 18019af0f475SMatthias Ringwald 1802613da3deSMatthias Ringwald // key management legacy connections: 1803613da3deSMatthias Ringwald // - potentially two different LTKs based on direction. each device stores LTK provided by peer 1804613da3deSMatthias Ringwald // - master stores LTK, EDIV, RAND. responder optionally stored master LTK (only if it needs to reconnect) 1805613da3deSMatthias Ringwald // - initiators reconnects: initiator uses stored LTK, EDIV, RAND generated by responder 1806613da3deSMatthias Ringwald // - responder reconnects: responder uses LTK receveived from master 1807613da3deSMatthias Ringwald 1808613da3deSMatthias Ringwald // key management secure connections: 1809613da3deSMatthias Ringwald // - both devices store same LTK from ECDH key exchange. 1810613da3deSMatthias Ringwald 181142134bc6SMatthias Ringwald #if defined(ENABLE_LE_SECURE_CONNECTIONS) || defined(ENABLE_LE_CENTRAL) 18125829ebe2SMatthias Ringwald static void sm_load_security_info(sm_connection_t * sm_connection){ 18135829ebe2SMatthias Ringwald int encryption_key_size; 18145829ebe2SMatthias Ringwald int authenticated; 18155829ebe2SMatthias Ringwald int authorized; 18165829ebe2SMatthias Ringwald 18175829ebe2SMatthias Ringwald // fetch data from device db - incl. authenticated/authorized/key size. Note all sm_connection_X require encryption enabled 18185829ebe2SMatthias Ringwald le_device_db_encryption_get(sm_connection->sm_le_db_index, &setup->sm_peer_ediv, setup->sm_peer_rand, setup->sm_peer_ltk, 18195829ebe2SMatthias Ringwald &encryption_key_size, &authenticated, &authorized); 18205829ebe2SMatthias Ringwald log_info("db index %u, key size %u, authenticated %u, authorized %u", sm_connection->sm_le_db_index, encryption_key_size, authenticated, authorized); 18215829ebe2SMatthias Ringwald sm_connection->sm_actual_encryption_key_size = encryption_key_size; 18225829ebe2SMatthias Ringwald sm_connection->sm_connection_authenticated = authenticated; 18235829ebe2SMatthias Ringwald sm_connection->sm_connection_authorization_state = authorized ? AUTHORIZATION_GRANTED : AUTHORIZATION_UNKNOWN; 18245829ebe2SMatthias Ringwald } 182542134bc6SMatthias Ringwald #endif 1826bd57ffebSMatthias Ringwald 182742134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 182859066796SMatthias Ringwald static void sm_start_calculating_ltk_from_ediv_and_rand(sm_connection_t * sm_connection){ 182959066796SMatthias Ringwald memcpy(setup->sm_local_rand, sm_connection->sm_local_rand, 8); 183059066796SMatthias Ringwald setup->sm_local_ediv = sm_connection->sm_local_ediv; 183159066796SMatthias Ringwald // re-establish used key encryption size 183259066796SMatthias Ringwald // no db for encryption size hack: encryption size is stored in lowest nibble of setup->sm_local_rand 183359066796SMatthias Ringwald sm_connection->sm_actual_encryption_key_size = (setup->sm_local_rand[7] & 0x0f) + 1; 183459066796SMatthias Ringwald // no db for authenticated flag hack: flag is stored in bit 4 of LSB 183559066796SMatthias Ringwald sm_connection->sm_connection_authenticated = (setup->sm_local_rand[7] & 0x10) >> 4; 183659066796SMatthias Ringwald log_info("sm: received ltk request with key size %u, authenticated %u", 183759066796SMatthias Ringwald sm_connection->sm_actual_encryption_key_size, sm_connection->sm_connection_authenticated); 183859066796SMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_PH4_Y_GET_ENC; 183959066796SMatthias Ringwald } 184042134bc6SMatthias Ringwald #endif 184159066796SMatthias Ringwald 18423deb3ec6SMatthias Ringwald static void sm_run(void){ 18433deb3ec6SMatthias Ringwald 1844665d90f2SMatthias Ringwald btstack_linked_list_iterator_t it; 18453deb3ec6SMatthias Ringwald 18461b1c95e9SMatthias Ringwald // assert that stack has already bootet 18471b1c95e9SMatthias Ringwald if (hci_get_state() != HCI_STATE_WORKING) return; 18481b1c95e9SMatthias Ringwald 18493deb3ec6SMatthias Ringwald // assert that we can send at least commands 18503deb3ec6SMatthias Ringwald if (!hci_can_send_command_packet_now()) return; 18513deb3ec6SMatthias Ringwald 18523deb3ec6SMatthias Ringwald // 18533deb3ec6SMatthias Ringwald // non-connection related behaviour 18543deb3ec6SMatthias Ringwald // 18553deb3ec6SMatthias Ringwald 18563deb3ec6SMatthias Ringwald // distributed key generation 18573deb3ec6SMatthias Ringwald switch (dkg_state){ 18583deb3ec6SMatthias Ringwald case DKG_CALC_IRK: 18593deb3ec6SMatthias Ringwald // already busy? 18603deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_IDLE) { 18613deb3ec6SMatthias Ringwald // IRK = d1(IR, 1, 0) 18623deb3ec6SMatthias Ringwald sm_key_t d1_prime; 18633deb3ec6SMatthias Ringwald sm_d1_d_prime(1, 0, d1_prime); // plaintext 18643deb3ec6SMatthias Ringwald dkg_next_state(); 18653deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_ir, d1_prime, NULL); 18663deb3ec6SMatthias Ringwald return; 18673deb3ec6SMatthias Ringwald } 18683deb3ec6SMatthias Ringwald break; 18693deb3ec6SMatthias Ringwald case DKG_CALC_DHK: 18703deb3ec6SMatthias Ringwald // already busy? 18713deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_IDLE) { 18723deb3ec6SMatthias Ringwald // DHK = d1(IR, 3, 0) 18733deb3ec6SMatthias Ringwald sm_key_t d1_prime; 18743deb3ec6SMatthias Ringwald sm_d1_d_prime(3, 0, d1_prime); // plaintext 18753deb3ec6SMatthias Ringwald dkg_next_state(); 18763deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_ir, d1_prime, NULL); 18773deb3ec6SMatthias Ringwald return; 18783deb3ec6SMatthias Ringwald } 18793deb3ec6SMatthias Ringwald break; 18803deb3ec6SMatthias Ringwald default: 18813deb3ec6SMatthias Ringwald break; 18823deb3ec6SMatthias Ringwald } 18833deb3ec6SMatthias Ringwald 188409e4d397SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 18857df18c15SMatthias Ringwald if (ec_key_generation_state == EC_KEY_GENERATION_ACTIVE){ 1886c692d776SMatthias Ringwald #ifndef HAVE_HCI_CONTROLLER_DHKEY_SUPPORT 18877df18c15SMatthias Ringwald sm_random_start(NULL); 188809e4d397SMatthias Ringwald #else 188909e4d397SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_W4_KEY; 189009e4d397SMatthias Ringwald hci_send_cmd(&hci_le_read_local_p256_public_key); 189109e4d397SMatthias Ringwald #endif 18927df18c15SMatthias Ringwald return; 18937df18c15SMatthias Ringwald } 18947df18c15SMatthias Ringwald #endif 18957df18c15SMatthias Ringwald 18963deb3ec6SMatthias Ringwald // random address updates 18973deb3ec6SMatthias Ringwald switch (rau_state){ 18983deb3ec6SMatthias Ringwald case RAU_GET_RANDOM: 18993deb3ec6SMatthias Ringwald rau_next_state(); 19003deb3ec6SMatthias Ringwald sm_random_start(NULL); 19013deb3ec6SMatthias Ringwald return; 19023deb3ec6SMatthias Ringwald case RAU_GET_ENC: 19033deb3ec6SMatthias Ringwald // already busy? 19043deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_IDLE) { 19053deb3ec6SMatthias Ringwald sm_key_t r_prime; 19063deb3ec6SMatthias Ringwald sm_ah_r_prime(sm_random_address, r_prime); 19073deb3ec6SMatthias Ringwald rau_next_state(); 19083deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_irk, r_prime, NULL); 19093deb3ec6SMatthias Ringwald return; 19103deb3ec6SMatthias Ringwald } 19113deb3ec6SMatthias Ringwald break; 19123deb3ec6SMatthias Ringwald case RAU_SET_ADDRESS: 19133deb3ec6SMatthias Ringwald log_info("New random address: %s", bd_addr_to_str(sm_random_address)); 19143deb3ec6SMatthias Ringwald rau_state = RAU_IDLE; 19153deb3ec6SMatthias Ringwald hci_send_cmd(&hci_le_set_random_address, sm_random_address); 19163deb3ec6SMatthias Ringwald return; 19173deb3ec6SMatthias Ringwald default: 19183deb3ec6SMatthias Ringwald break; 19193deb3ec6SMatthias Ringwald } 19203deb3ec6SMatthias Ringwald 19217a766ebfSMatthias Ringwald #ifdef ENABLE_CMAC_ENGINE 19223deb3ec6SMatthias Ringwald // CMAC 19233deb3ec6SMatthias Ringwald switch (sm_cmac_state){ 19243deb3ec6SMatthias Ringwald case CMAC_CALC_SUBKEYS: 19253deb3ec6SMatthias Ringwald case CMAC_CALC_MI: 19263deb3ec6SMatthias Ringwald case CMAC_CALC_MLAST: 19273deb3ec6SMatthias Ringwald // already busy? 19283deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 19293deb3ec6SMatthias Ringwald sm_cmac_handle_aes_engine_ready(); 19303deb3ec6SMatthias Ringwald return; 19313deb3ec6SMatthias Ringwald default: 19323deb3ec6SMatthias Ringwald break; 19333deb3ec6SMatthias Ringwald } 19347a766ebfSMatthias Ringwald #endif 19353deb3ec6SMatthias Ringwald 19363deb3ec6SMatthias Ringwald // CSRK Lookup 19373deb3ec6SMatthias Ringwald // -- if csrk lookup ready, find connection that require csrk lookup 19383deb3ec6SMatthias Ringwald if (sm_address_resolution_idle()){ 19393deb3ec6SMatthias Ringwald hci_connections_get_iterator(&it); 1940665d90f2SMatthias Ringwald while(btstack_linked_list_iterator_has_next(&it)){ 1941665d90f2SMatthias Ringwald hci_connection_t * hci_connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 19423deb3ec6SMatthias Ringwald sm_connection_t * sm_connection = &hci_connection->sm_connection; 19433deb3ec6SMatthias Ringwald if (sm_connection->sm_irk_lookup_state == IRK_LOOKUP_W4_READY){ 19443deb3ec6SMatthias Ringwald // and start lookup 19453deb3ec6SMatthias Ringwald sm_address_resolution_start_lookup(sm_connection->sm_peer_addr_type, sm_connection->sm_handle, sm_connection->sm_peer_address, ADDRESS_RESOLUTION_FOR_CONNECTION, sm_connection); 19463deb3ec6SMatthias Ringwald sm_connection->sm_irk_lookup_state = IRK_LOOKUP_STARTED; 19473deb3ec6SMatthias Ringwald break; 19483deb3ec6SMatthias Ringwald } 19493deb3ec6SMatthias Ringwald } 19503deb3ec6SMatthias Ringwald } 19513deb3ec6SMatthias Ringwald 19523deb3ec6SMatthias Ringwald // -- if csrk lookup ready, resolved addresses for received addresses 19533deb3ec6SMatthias Ringwald if (sm_address_resolution_idle()) { 1954665d90f2SMatthias Ringwald if (!btstack_linked_list_empty(&sm_address_resolution_general_queue)){ 19553deb3ec6SMatthias Ringwald sm_lookup_entry_t * entry = (sm_lookup_entry_t *) sm_address_resolution_general_queue; 1956665d90f2SMatthias Ringwald btstack_linked_list_remove(&sm_address_resolution_general_queue, (btstack_linked_item_t *) entry); 19573deb3ec6SMatthias Ringwald sm_address_resolution_start_lookup(entry->address_type, 0, entry->address, ADDRESS_RESOLUTION_GENERAL, NULL); 19583deb3ec6SMatthias Ringwald btstack_memory_sm_lookup_entry_free(entry); 19593deb3ec6SMatthias Ringwald } 19603deb3ec6SMatthias Ringwald } 19613deb3ec6SMatthias Ringwald 19623deb3ec6SMatthias Ringwald // -- Continue with CSRK device lookup by public or resolvable private address 19633deb3ec6SMatthias Ringwald if (!sm_address_resolution_idle()){ 19643deb3ec6SMatthias Ringwald log_info("LE Device Lookup: device %u/%u", sm_address_resolution_test, le_device_db_count()); 19653deb3ec6SMatthias Ringwald while (sm_address_resolution_test < le_device_db_count()){ 19663deb3ec6SMatthias Ringwald int addr_type; 19673deb3ec6SMatthias Ringwald bd_addr_t addr; 19683deb3ec6SMatthias Ringwald sm_key_t irk; 19693deb3ec6SMatthias Ringwald le_device_db_info(sm_address_resolution_test, &addr_type, addr, irk); 19703deb3ec6SMatthias Ringwald log_info("device type %u, addr: %s", addr_type, bd_addr_to_str(addr)); 19713deb3ec6SMatthias Ringwald 19723deb3ec6SMatthias Ringwald if (sm_address_resolution_addr_type == addr_type && memcmp(addr, sm_address_resolution_address, 6) == 0){ 19733deb3ec6SMatthias Ringwald log_info("LE Device Lookup: found CSRK by { addr_type, address} "); 19743deb3ec6SMatthias Ringwald sm_address_resolution_handle_event(ADDRESS_RESOLUTION_SUCEEDED); 19753deb3ec6SMatthias Ringwald break; 19763deb3ec6SMatthias Ringwald } 19773deb3ec6SMatthias Ringwald 19783deb3ec6SMatthias Ringwald if (sm_address_resolution_addr_type == 0){ 19793deb3ec6SMatthias Ringwald sm_address_resolution_test++; 19803deb3ec6SMatthias Ringwald continue; 19813deb3ec6SMatthias Ringwald } 19823deb3ec6SMatthias Ringwald 19833deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 19843deb3ec6SMatthias Ringwald 19853deb3ec6SMatthias Ringwald log_info("LE Device Lookup: calculate AH"); 19868314c363SMatthias Ringwald log_info_key("IRK", irk); 19873deb3ec6SMatthias Ringwald 19883deb3ec6SMatthias Ringwald sm_key_t r_prime; 19893deb3ec6SMatthias Ringwald sm_ah_r_prime(sm_address_resolution_address, r_prime); 19903deb3ec6SMatthias Ringwald sm_address_resolution_ah_calculation_active = 1; 19913deb3ec6SMatthias Ringwald sm_aes128_start(irk, r_prime, sm_address_resolution_context); // keep context 19923deb3ec6SMatthias Ringwald return; 19933deb3ec6SMatthias Ringwald } 19943deb3ec6SMatthias Ringwald 19953deb3ec6SMatthias Ringwald if (sm_address_resolution_test >= le_device_db_count()){ 19963deb3ec6SMatthias Ringwald log_info("LE Device Lookup: not found"); 19973deb3ec6SMatthias Ringwald sm_address_resolution_handle_event(ADDRESS_RESOLUTION_FAILED); 19983deb3ec6SMatthias Ringwald } 19993deb3ec6SMatthias Ringwald } 20003deb3ec6SMatthias Ringwald 200141d32297SMatthias Ringwald // handle basic actions that don't requires the full context 200241d32297SMatthias Ringwald hci_connections_get_iterator(&it); 20037149bde5SMatthias Ringwald while((sm_active_connection_handle == HCI_CON_HANDLE_INVALID) && btstack_linked_list_iterator_has_next(&it)){ 200441d32297SMatthias Ringwald hci_connection_t * hci_connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 200541d32297SMatthias Ringwald sm_connection_t * sm_connection = &hci_connection->sm_connection; 200641d32297SMatthias Ringwald switch(sm_connection->sm_engine_state){ 200741d32297SMatthias Ringwald // responder side 200841d32297SMatthias Ringwald case SM_RESPONDER_PH0_SEND_LTK_REQUESTED_NEGATIVE_REPLY: 200941d32297SMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_IDLE; 201041d32297SMatthias Ringwald hci_send_cmd(&hci_le_long_term_key_negative_reply, sm_connection->sm_handle); 201141d32297SMatthias Ringwald return; 20124b8b5afeSMatthias Ringwald 20134b8b5afeSMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 20144b8b5afeSMatthias Ringwald case SM_SC_RECEIVED_LTK_REQUEST: 20154b8b5afeSMatthias Ringwald switch (sm_connection->sm_irk_lookup_state){ 20164b8b5afeSMatthias Ringwald case IRK_LOOKUP_FAILED: 20174b8b5afeSMatthias Ringwald log_info("LTK Request: ediv & random are empty, but no stored LTK (IRK Lookup Failed)"); 20184b8b5afeSMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_IDLE; 20194b8b5afeSMatthias Ringwald hci_send_cmd(&hci_le_long_term_key_negative_reply, sm_connection->sm_handle); 20204b8b5afeSMatthias Ringwald return; 20214b8b5afeSMatthias Ringwald default: 20224b8b5afeSMatthias Ringwald break; 20234b8b5afeSMatthias Ringwald } 20244b8b5afeSMatthias Ringwald break; 20254b8b5afeSMatthias Ringwald #endif 202641d32297SMatthias Ringwald default: 202741d32297SMatthias Ringwald break; 202841d32297SMatthias Ringwald } 202941d32297SMatthias Ringwald } 20303deb3ec6SMatthias Ringwald 20313deb3ec6SMatthias Ringwald // 20323deb3ec6SMatthias Ringwald // active connection handling 20333deb3ec6SMatthias Ringwald // -- use loop to handle next connection if lock on setup context is released 20343deb3ec6SMatthias Ringwald 20353deb3ec6SMatthias Ringwald while (1) { 20363deb3ec6SMatthias Ringwald 20373deb3ec6SMatthias Ringwald // Find connections that requires setup context and make active if no other is locked 20383deb3ec6SMatthias Ringwald hci_connections_get_iterator(&it); 20397149bde5SMatthias Ringwald while((sm_active_connection_handle == HCI_CON_HANDLE_INVALID) && btstack_linked_list_iterator_has_next(&it)){ 2040665d90f2SMatthias Ringwald hci_connection_t * hci_connection = (hci_connection_t *) btstack_linked_list_iterator_next(&it); 20413deb3ec6SMatthias Ringwald sm_connection_t * sm_connection = &hci_connection->sm_connection; 20423deb3ec6SMatthias Ringwald // - if no connection locked and we're ready/waiting for setup context, fetch it and start 20433deb3ec6SMatthias Ringwald int done = 1; 20443deb3ec6SMatthias Ringwald int err; 204542134bc6SMatthias Ringwald UNUSED(err); 20463deb3ec6SMatthias Ringwald switch (sm_connection->sm_engine_state) { 204742134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 20483deb3ec6SMatthias Ringwald case SM_RESPONDER_SEND_SECURITY_REQUEST: 20493deb3ec6SMatthias Ringwald // send packet if possible, 2050adbe29e8SMatthias Ringwald if (l2cap_can_send_fixed_channel_packet_now(sm_connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL)){ 2051b170b20fSMatthias Ringwald const uint8_t buffer[2] = { SM_CODE_SECURITY_REQUEST, SM_AUTHREQ_BONDING}; 20523deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_PH1_W4_PAIRING_REQUEST; 20533deb3ec6SMatthias Ringwald l2cap_send_connectionless(sm_connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 2054b170b20fSMatthias Ringwald } else { 2055b170b20fSMatthias Ringwald l2cap_request_can_send_fix_channel_now_event(sm_connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL); 20563deb3ec6SMatthias Ringwald } 20575829ebe2SMatthias Ringwald // don't lock sxetup context yet 20583deb3ec6SMatthias Ringwald done = 0; 20593deb3ec6SMatthias Ringwald break; 20603deb3ec6SMatthias Ringwald case SM_RESPONDER_PH1_PAIRING_REQUEST_RECEIVED: 2061d7471931SMatthias Ringwald sm_reset_setup(); 20623deb3ec6SMatthias Ringwald sm_init_setup(sm_connection); 20633deb3ec6SMatthias Ringwald // recover pairing request 20643deb3ec6SMatthias Ringwald memcpy(&setup->sm_m_preq, &sm_connection->sm_m_preq, sizeof(sm_pairing_packet_t)); 20653deb3ec6SMatthias Ringwald err = sm_stk_generation_init(sm_connection); 20663deb3ec6SMatthias Ringwald if (err){ 20673deb3ec6SMatthias Ringwald setup->sm_pairing_failed_reason = err; 20683deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_GENERAL_SEND_PAIRING_FAILED; 20693deb3ec6SMatthias Ringwald break; 20703deb3ec6SMatthias Ringwald } 20713deb3ec6SMatthias Ringwald sm_timeout_start(sm_connection); 20723deb3ec6SMatthias Ringwald // generate random number first, if we need to show passkey 20733deb3ec6SMatthias Ringwald if (setup->sm_stk_generation_method == PK_INIT_INPUT){ 20743deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_PH2_GET_RANDOM_TK; 20753deb3ec6SMatthias Ringwald break; 20763deb3ec6SMatthias Ringwald } 20773deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_PH1_SEND_PAIRING_RESPONSE; 20783deb3ec6SMatthias Ringwald break; 207942134bc6SMatthias Ringwald case SM_RESPONDER_PH0_RECEIVED_LTK_REQUEST: 208042134bc6SMatthias Ringwald sm_reset_setup(); 208142134bc6SMatthias Ringwald sm_start_calculating_ltk_from_ediv_and_rand(sm_connection); 208242134bc6SMatthias Ringwald break; 208342134bc6SMatthias Ringwald #endif 208442134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 20853deb3ec6SMatthias Ringwald case SM_INITIATOR_PH0_HAS_LTK: 2086d7471931SMatthias Ringwald sm_reset_setup(); 20875829ebe2SMatthias Ringwald sm_load_security_info(sm_connection); 20883deb3ec6SMatthias Ringwald sm_connection->sm_engine_state = SM_INITIATOR_PH0_SEND_START_ENCRYPTION; 20893deb3ec6SMatthias Ringwald break; 209006cd539fSMatthias Ringwald case SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST: 209106cd539fSMatthias Ringwald sm_reset_setup(); 209206cd539fSMatthias Ringwald sm_init_setup(sm_connection); 209306cd539fSMatthias Ringwald sm_timeout_start(sm_connection); 209406cd539fSMatthias Ringwald sm_connection->sm_engine_state = SM_INITIATOR_PH1_SEND_PAIRING_REQUEST; 209506cd539fSMatthias Ringwald break; 209642134bc6SMatthias Ringwald #endif 209706cd539fSMatthias Ringwald 2098549ad5d2SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 209906cd539fSMatthias Ringwald case SM_SC_RECEIVED_LTK_REQUEST: 21005829ebe2SMatthias Ringwald switch (sm_connection->sm_irk_lookup_state){ 2101549ad5d2SMatthias Ringwald case IRK_LOOKUP_SUCCEEDED: 2102549ad5d2SMatthias Ringwald // assuming Secure Connection, we have a stored LTK and the EDIV/RAND are null 210341d32297SMatthias Ringwald // start using context by loading security info 2104d7471931SMatthias Ringwald sm_reset_setup(); 21055829ebe2SMatthias Ringwald sm_load_security_info(sm_connection); 2106549ad5d2SMatthias Ringwald if (setup->sm_peer_ediv == 0 && sm_is_null_random(setup->sm_peer_rand) && !sm_is_null_key(setup->sm_peer_ltk)){ 2107d7471931SMatthias Ringwald memcpy(setup->sm_ltk, setup->sm_peer_ltk, 16); 2108d7471931SMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_PH4_SEND_LTK_REPLY; 21095829ebe2SMatthias Ringwald break; 21105829ebe2SMatthias Ringwald } 2111549ad5d2SMatthias Ringwald log_info("LTK Request: ediv & random are empty, but no stored LTK (IRK Lookup Succeeded)"); 21124b8b5afeSMatthias Ringwald sm_connection->sm_engine_state = SM_RESPONDER_IDLE; 21134b8b5afeSMatthias Ringwald hci_send_cmd(&hci_le_long_term_key_negative_reply, sm_connection->sm_handle); 21144b8b5afeSMatthias Ringwald // don't lock setup context yet 21154b8b5afeSMatthias Ringwald return; 21165829ebe2SMatthias Ringwald default: 21175829ebe2SMatthias Ringwald // just wait until IRK lookup is completed 211859066796SMatthias Ringwald // don't lock setup context yet 21195829ebe2SMatthias Ringwald done = 0; 21205829ebe2SMatthias Ringwald break; 21215829ebe2SMatthias Ringwald } 212206cd539fSMatthias Ringwald break; 2123549ad5d2SMatthias Ringwald #endif 21243deb3ec6SMatthias Ringwald default: 21253deb3ec6SMatthias Ringwald done = 0; 21263deb3ec6SMatthias Ringwald break; 21273deb3ec6SMatthias Ringwald } 21283deb3ec6SMatthias Ringwald if (done){ 21297149bde5SMatthias Ringwald sm_active_connection_handle = sm_connection->sm_handle; 21307149bde5SMatthias Ringwald log_info("sm: connection 0x%04x locked setup context as %s, state %u", sm_active_connection_handle, sm_connection->sm_role ? "responder" : "initiator", sm_connection->sm_engine_state); 21313deb3ec6SMatthias Ringwald } 21323deb3ec6SMatthias Ringwald } 21333deb3ec6SMatthias Ringwald 21343deb3ec6SMatthias Ringwald // 21353deb3ec6SMatthias Ringwald // active connection handling 21363deb3ec6SMatthias Ringwald // 21373deb3ec6SMatthias Ringwald 21387149bde5SMatthias Ringwald if (sm_active_connection_handle == HCI_CON_HANDLE_INVALID) return; 21393deb3ec6SMatthias Ringwald 21403deb3ec6SMatthias Ringwald // assert that we could send a SM PDU - not needed for all of the following 21417149bde5SMatthias Ringwald if (!l2cap_can_send_fixed_channel_packet_now(sm_active_connection_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL)) { 21427149bde5SMatthias Ringwald log_info("cannot send now, requesting can send now event"); 21437149bde5SMatthias Ringwald l2cap_request_can_send_fix_channel_now_event(sm_active_connection_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL); 2144b170b20fSMatthias Ringwald return; 2145b170b20fSMatthias Ringwald } 21463deb3ec6SMatthias Ringwald 21477149bde5SMatthias Ringwald sm_connection_t * connection = sm_get_connection_for_handle(sm_active_connection_handle); 21487149bde5SMatthias Ringwald if (!connection) { 21497149bde5SMatthias Ringwald log_info("no connection for handle 0x%04x", sm_active_connection_handle); 21507149bde5SMatthias Ringwald return; 21517149bde5SMatthias Ringwald } 21523deb3ec6SMatthias Ringwald 21533d7fe1e9SMatthias Ringwald // send keypress notifications 21543d7fe1e9SMatthias Ringwald if (setup->sm_keypress_notification != 0xff){ 21553d7fe1e9SMatthias Ringwald uint8_t buffer[2]; 21563d7fe1e9SMatthias Ringwald buffer[0] = SM_CODE_KEYPRESS_NOTIFICATION; 21573d7fe1e9SMatthias Ringwald buffer[1] = setup->sm_keypress_notification; 21583d7fe1e9SMatthias Ringwald setup->sm_keypress_notification = 0xff; 21593d7fe1e9SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 2160d7471931SMatthias Ringwald return; 21613d7fe1e9SMatthias Ringwald } 21623d7fe1e9SMatthias Ringwald 21633deb3ec6SMatthias Ringwald sm_key_t plaintext; 21643deb3ec6SMatthias Ringwald int key_distribution_flags; 216542134bc6SMatthias Ringwald UNUSED(key_distribution_flags); 21663deb3ec6SMatthias Ringwald 21673deb3ec6SMatthias Ringwald log_info("sm_run: state %u", connection->sm_engine_state); 21683deb3ec6SMatthias Ringwald 21693deb3ec6SMatthias Ringwald switch (connection->sm_engine_state){ 21703deb3ec6SMatthias Ringwald 21713deb3ec6SMatthias Ringwald // general 21723deb3ec6SMatthias Ringwald case SM_GENERAL_SEND_PAIRING_FAILED: { 21733deb3ec6SMatthias Ringwald uint8_t buffer[2]; 21743deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_FAILED; 21753deb3ec6SMatthias Ringwald buffer[1] = setup->sm_pairing_failed_reason; 21763deb3ec6SMatthias Ringwald connection->sm_engine_state = connection->sm_role ? SM_RESPONDER_IDLE : SM_INITIATOR_CONNECTED; 21773deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 21783deb3ec6SMatthias Ringwald sm_done_for_handle(connection->sm_handle); 21793deb3ec6SMatthias Ringwald break; 21803deb3ec6SMatthias Ringwald } 21813deb3ec6SMatthias Ringwald 218241d32297SMatthias Ringwald // responding state 2183aec94140SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 2184f1c1783eSMatthias Ringwald case SM_SC_W2_GET_RANDOM_A: 2185f1c1783eSMatthias Ringwald sm_random_start(connection); 2186f1c1783eSMatthias Ringwald connection->sm_engine_state = SM_SC_W4_GET_RANDOM_A; 2187f1c1783eSMatthias Ringwald break; 2188f1c1783eSMatthias Ringwald case SM_SC_W2_GET_RANDOM_B: 2189f1c1783eSMatthias Ringwald sm_random_start(connection); 2190f1c1783eSMatthias Ringwald connection->sm_engine_state = SM_SC_W4_GET_RANDOM_B; 2191f1c1783eSMatthias Ringwald break; 2192aec94140SMatthias Ringwald case SM_SC_W2_CMAC_FOR_CONFIRMATION: 2193aec94140SMatthias Ringwald if (!sm_cmac_ready()) break; 2194aec94140SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CMAC_FOR_CONFIRMATION; 2195aec94140SMatthias Ringwald sm_sc_calculate_local_confirm(connection); 2196aec94140SMatthias Ringwald break; 2197688a08f9SMatthias Ringwald case SM_SC_W2_CMAC_FOR_CHECK_CONFIRMATION: 2198688a08f9SMatthias Ringwald if (!sm_cmac_ready()) break; 2199688a08f9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CMAC_FOR_CHECK_CONFIRMATION; 2200688a08f9SMatthias Ringwald sm_sc_calculate_remote_confirm(connection); 2201688a08f9SMatthias Ringwald break; 2202dc300847SMatthias Ringwald case SM_SC_W2_CALCULATE_F6_FOR_DHKEY_CHECK: 2203dc300847SMatthias Ringwald if (!sm_cmac_ready()) break; 2204dc300847SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_F6_FOR_DHKEY_CHECK; 2205dc300847SMatthias Ringwald sm_sc_calculate_f6_for_dhkey_check(connection); 2206dc300847SMatthias Ringwald break; 2207019005a0SMatthias Ringwald case SM_SC_W2_CALCULATE_F6_TO_VERIFY_DHKEY_CHECK: 2208b35a3de2SMatthias Ringwald if (!sm_cmac_ready()) break; 2209019005a0SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_F6_TO_VERIFY_DHKEY_CHECK; 22100346c37cSMatthias Ringwald sm_sc_calculate_f6_to_verify_dhkey_check(connection); 22110346c37cSMatthias Ringwald break; 22120346c37cSMatthias Ringwald case SM_SC_W2_CALCULATE_F5_SALT: 2213b35a3de2SMatthias Ringwald if (!sm_cmac_ready()) break; 22140346c37cSMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_F5_SALT; 22150346c37cSMatthias Ringwald f5_calculate_salt(connection); 22160346c37cSMatthias Ringwald break; 22170346c37cSMatthias Ringwald case SM_SC_W2_CALCULATE_F5_MACKEY: 2218b35a3de2SMatthias Ringwald if (!sm_cmac_ready()) break; 22190346c37cSMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_F5_MACKEY; 22200346c37cSMatthias Ringwald f5_calculate_mackey(connection); 22210346c37cSMatthias Ringwald break; 22220346c37cSMatthias Ringwald case SM_SC_W2_CALCULATE_F5_LTK: 2223b35a3de2SMatthias Ringwald if (!sm_cmac_ready()) break; 22240346c37cSMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_F5_LTK; 22250346c37cSMatthias Ringwald f5_calculate_ltk(connection); 2226019005a0SMatthias Ringwald break; 2227bd57ffebSMatthias Ringwald case SM_SC_W2_CALCULATE_G2: 2228b35a3de2SMatthias Ringwald if (!sm_cmac_ready()) break; 2229bd57ffebSMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_G2; 2230b35a3de2SMatthias Ringwald g2_calculate(connection); 2231bd57ffebSMatthias Ringwald break; 22322bacf595SMatthias Ringwald case SM_SC_W2_CALCULATE_H6_ILK: 22332bacf595SMatthias Ringwald if (!sm_cmac_ready()) break; 22342bacf595SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_H6_ILK; 22352bacf595SMatthias Ringwald h6_calculate_ilk(connection); 22362bacf595SMatthias Ringwald break; 22372bacf595SMatthias Ringwald case SM_SC_W2_CALCULATE_H6_BR_EDR_LINK_KEY: 22382bacf595SMatthias Ringwald if (!sm_cmac_ready()) break; 22392bacf595SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CALCULATE_H6_BR_EDR_LINK_KEY; 22402bacf595SMatthias Ringwald h6_calculate_br_edr_link_key(connection); 22412bacf595SMatthias Ringwald break; 2242aec94140SMatthias Ringwald #endif 224341d32297SMatthias Ringwald 224442134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 22453deb3ec6SMatthias Ringwald // initiator side 22463deb3ec6SMatthias Ringwald case SM_INITIATOR_PH0_SEND_START_ENCRYPTION: { 22473deb3ec6SMatthias Ringwald sm_key_t peer_ltk_flipped; 22489c80e4ccSMatthias Ringwald reverse_128(setup->sm_peer_ltk, peer_ltk_flipped); 22493deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_PH0_W4_CONNECTION_ENCRYPTED; 22503deb3ec6SMatthias Ringwald log_info("sm: hci_le_start_encryption ediv 0x%04x", setup->sm_peer_ediv); 2251c9b8fdd9SMatthias Ringwald uint32_t rand_high = big_endian_read_32(setup->sm_peer_rand, 0); 2252c9b8fdd9SMatthias Ringwald uint32_t rand_low = big_endian_read_32(setup->sm_peer_rand, 4); 22533deb3ec6SMatthias Ringwald hci_send_cmd(&hci_le_start_encryption, connection->sm_handle,rand_low, rand_high, setup->sm_peer_ediv, peer_ltk_flipped); 22543deb3ec6SMatthias Ringwald return; 22553deb3ec6SMatthias Ringwald } 22563deb3ec6SMatthias Ringwald 22573deb3ec6SMatthias Ringwald case SM_INITIATOR_PH1_SEND_PAIRING_REQUEST: 22581ad129beSMatthias Ringwald sm_pairing_packet_set_code(setup->sm_m_preq, SM_CODE_PAIRING_REQUEST); 22593deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_PH1_W4_PAIRING_RESPONSE; 22603deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) &setup->sm_m_preq, sizeof(sm_pairing_packet_t)); 22613deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 22623deb3ec6SMatthias Ringwald break; 226342134bc6SMatthias Ringwald #endif 22643deb3ec6SMatthias Ringwald 226527c32905SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 226641d32297SMatthias Ringwald 2267c6b7cbd9SMatthias Ringwald case SM_SC_SEND_PUBLIC_KEY_COMMAND: { 226827c32905SMatthias Ringwald uint8_t buffer[65]; 226927c32905SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_PUBLIC_KEY; 227027c32905SMatthias Ringwald // 2271fc5bff5fSMatthias Ringwald reverse_256(&ec_q[0], &buffer[1]); 2272fc5bff5fSMatthias Ringwald reverse_256(&ec_q[32], &buffer[33]); 2273e53be891SMatthias Ringwald 227445a61d50SMatthias Ringwald // stk generation method 227545a61d50SMatthias Ringwald // passkey entry: notify app to show passkey or to request passkey 227645a61d50SMatthias Ringwald switch (setup->sm_stk_generation_method){ 227745a61d50SMatthias Ringwald case JUST_WORKS: 227845a61d50SMatthias Ringwald case NK_BOTH_INPUT: 227942134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 228007036a04SMatthias Ringwald // responder 2281b35a3de2SMatthias Ringwald sm_sc_start_calculating_local_confirm(connection); 228227c32905SMatthias Ringwald } else { 228307036a04SMatthias Ringwald // initiator 2284c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_PUBLIC_KEY_COMMAND; 228527c32905SMatthias Ringwald } 228645a61d50SMatthias Ringwald break; 228745a61d50SMatthias Ringwald case PK_INIT_INPUT: 228845a61d50SMatthias Ringwald case PK_RESP_INPUT: 228945a61d50SMatthias Ringwald case OK_BOTH_INPUT: 229007036a04SMatthias Ringwald // use random TK for display 229145a61d50SMatthias Ringwald memcpy(setup->sm_ra, setup->sm_tk, 16); 229245a61d50SMatthias Ringwald memcpy(setup->sm_rb, setup->sm_tk, 16); 229345a61d50SMatthias Ringwald setup->sm_passkey_bit = 0; 229407036a04SMatthias Ringwald 229542134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 229645a61d50SMatthias Ringwald // responder 2297c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CONFIRMATION; 229845a61d50SMatthias Ringwald } else { 229945a61d50SMatthias Ringwald // initiator 2300c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_PUBLIC_KEY_COMMAND; 230145a61d50SMatthias Ringwald } 230245a61d50SMatthias Ringwald sm_trigger_user_response(connection); 230345a61d50SMatthias Ringwald break; 230445a61d50SMatthias Ringwald case OOB: 230545a61d50SMatthias Ringwald // TODO: implement SC OOB 230645a61d50SMatthias Ringwald break; 230745a61d50SMatthias Ringwald } 230845a61d50SMatthias Ringwald 230927c32905SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 231027c32905SMatthias Ringwald sm_timeout_reset(connection); 231127c32905SMatthias Ringwald break; 231227c32905SMatthias Ringwald } 2313c6b7cbd9SMatthias Ringwald case SM_SC_SEND_CONFIRMATION: { 2314e53be891SMatthias Ringwald uint8_t buffer[17]; 2315e53be891SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_CONFIRM; 23169af0f475SMatthias Ringwald reverse_128(setup->sm_local_confirm, &buffer[1]); 231742134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 2318c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_PAIRING_RANDOM; 2319e53be891SMatthias Ringwald } else { 2320c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CONFIRMATION; 2321e53be891SMatthias Ringwald } 2322e53be891SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 2323e53be891SMatthias Ringwald sm_timeout_reset(connection); 2324e53be891SMatthias Ringwald break; 2325e53be891SMatthias Ringwald } 2326c6b7cbd9SMatthias Ringwald case SM_SC_SEND_PAIRING_RANDOM: { 2327e53be891SMatthias Ringwald uint8_t buffer[17]; 2328e53be891SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_RANDOM; 2329e53be891SMatthias Ringwald reverse_128(setup->sm_local_nonce, &buffer[1]); 233045a61d50SMatthias Ringwald if (setup->sm_stk_generation_method != JUST_WORKS && setup->sm_stk_generation_method != NK_BOTH_INPUT && setup->sm_passkey_bit < 20){ 233142134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 233245a61d50SMatthias Ringwald // responder 2333c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_CONFIRMATION; 233445a61d50SMatthias Ringwald } else { 233545a61d50SMatthias Ringwald // initiator 2336c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_PAIRING_RANDOM; 233745a61d50SMatthias Ringwald } 233845a61d50SMatthias Ringwald } else { 233942134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 2340e53be891SMatthias Ringwald // responder 2341446a8c36SMatthias Ringwald if (setup->sm_stk_generation_method == NK_BOTH_INPUT){ 2342901c000fSMatthias Ringwald connection->sm_engine_state = SM_SC_W2_CALCULATE_G2; 23432886623dSMatthias Ringwald } else { 23442886623dSMatthias Ringwald sm_sc_prepare_dhkey_check(connection); 2345446a8c36SMatthias Ringwald } 2346e53be891SMatthias Ringwald } else { 2347136d331aSMatthias Ringwald // initiator 2348c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_PAIRING_RANDOM; 2349e53be891SMatthias Ringwald } 235045a61d50SMatthias Ringwald } 2351e53be891SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 2352e53be891SMatthias Ringwald sm_timeout_reset(connection); 2353e53be891SMatthias Ringwald break; 2354e53be891SMatthias Ringwald } 2355c6b7cbd9SMatthias Ringwald case SM_SC_SEND_DHKEY_CHECK_COMMAND: { 2356e083ca23SMatthias Ringwald uint8_t buffer[17]; 2357e083ca23SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_DHKEY_CHECK; 2358e53be891SMatthias Ringwald reverse_128(setup->sm_local_dhkey_check, &buffer[1]); 2359dc300847SMatthias Ringwald 236042134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 2361c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_LTK_REQUEST_SC; 2362e53be891SMatthias Ringwald } else { 2363c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_DHKEY_CHECK_COMMAND; 2364e53be891SMatthias Ringwald } 2365e083ca23SMatthias Ringwald 2366e53be891SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 2367e53be891SMatthias Ringwald sm_timeout_reset(connection); 2368e53be891SMatthias Ringwald break; 2369e53be891SMatthias Ringwald } 2370e53be891SMatthias Ringwald 2371e53be891SMatthias Ringwald #endif 237242134bc6SMatthias Ringwald 237342134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 23743deb3ec6SMatthias Ringwald case SM_RESPONDER_PH1_SEND_PAIRING_RESPONSE: 23753deb3ec6SMatthias Ringwald // echo initiator for now 23761ad129beSMatthias Ringwald sm_pairing_packet_set_code(setup->sm_s_pres,SM_CODE_PAIRING_RESPONSE); 23773deb3ec6SMatthias Ringwald key_distribution_flags = sm_key_distribution_flags_for_auth_req(); 23781ad129beSMatthias Ringwald 237927c32905SMatthias Ringwald if (setup->sm_use_secure_connections){ 2380c6b7cbd9SMatthias Ringwald connection->sm_engine_state = SM_SC_W4_PUBLIC_KEY_COMMAND; 238152f9cf63SMatthias Ringwald // skip LTK/EDIV for SC 2382bbf8db22SMatthias Ringwald log_info("sm: dropping encryption information flag"); 238352f9cf63SMatthias Ringwald key_distribution_flags &= ~SM_KEYDIST_ENC_KEY; 23840b8af2a5SMatthias Ringwald } else { 23850b8af2a5SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH1_W4_PAIRING_CONFIRM; 238627c32905SMatthias Ringwald } 23870b8af2a5SMatthias Ringwald 238852f9cf63SMatthias Ringwald sm_pairing_packet_set_initiator_key_distribution(setup->sm_s_pres, sm_pairing_packet_get_initiator_key_distribution(setup->sm_m_preq) & key_distribution_flags); 238952f9cf63SMatthias Ringwald sm_pairing_packet_set_responder_key_distribution(setup->sm_s_pres, sm_pairing_packet_get_responder_key_distribution(setup->sm_m_preq) & key_distribution_flags); 2390bbf8db22SMatthias Ringwald // update key distribution after ENC was dropped 2391cfd5ff74SMatthias Ringwald sm_setup_key_distribution(sm_pairing_packet_get_responder_key_distribution(setup->sm_s_pres)); 239252f9cf63SMatthias Ringwald 23933deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) &setup->sm_s_pres, sizeof(sm_pairing_packet_t)); 23943deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 2395446a8c36SMatthias Ringwald // SC Numeric Comparison will trigger user response after public keys & nonces have been exchanged 23960b8af2a5SMatthias Ringwald if (!setup->sm_use_secure_connections || setup->sm_stk_generation_method == JUST_WORKS){ 23973deb3ec6SMatthias Ringwald sm_trigger_user_response(connection); 2398446a8c36SMatthias Ringwald } 23993deb3ec6SMatthias Ringwald return; 240042134bc6SMatthias Ringwald #endif 24013deb3ec6SMatthias Ringwald 24023deb3ec6SMatthias Ringwald case SM_PH2_SEND_PAIRING_RANDOM: { 24033deb3ec6SMatthias Ringwald uint8_t buffer[17]; 24043deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_RANDOM; 24059c80e4ccSMatthias Ringwald reverse_128(setup->sm_local_random, &buffer[1]); 240642134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 24073deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH2_W4_LTK_REQUEST; 24083deb3ec6SMatthias Ringwald } else { 24093deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_PH2_W4_PAIRING_RANDOM; 24103deb3ec6SMatthias Ringwald } 24113deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 24123deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 24133deb3ec6SMatthias Ringwald break; 24143deb3ec6SMatthias Ringwald } 24153deb3ec6SMatthias Ringwald 24163deb3ec6SMatthias Ringwald case SM_PH2_GET_RANDOM_TK: 24173deb3ec6SMatthias Ringwald case SM_PH2_C1_GET_RANDOM_A: 24183deb3ec6SMatthias Ringwald case SM_PH2_C1_GET_RANDOM_B: 24193deb3ec6SMatthias Ringwald case SM_PH3_GET_RANDOM: 24203deb3ec6SMatthias Ringwald case SM_PH3_GET_DIV: 24213deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24223deb3ec6SMatthias Ringwald sm_random_start(connection); 24233deb3ec6SMatthias Ringwald return; 24243deb3ec6SMatthias Ringwald 24253deb3ec6SMatthias Ringwald case SM_PH2_C1_GET_ENC_B: 24263deb3ec6SMatthias Ringwald case SM_PH2_C1_GET_ENC_D: 24273deb3ec6SMatthias Ringwald // already busy? 24283deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 24293deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24303deb3ec6SMatthias Ringwald sm_aes128_start(setup->sm_tk, setup->sm_c1_t3_value, connection); 24313deb3ec6SMatthias Ringwald return; 24323deb3ec6SMatthias Ringwald 24333deb3ec6SMatthias Ringwald case SM_PH3_LTK_GET_ENC: 24343deb3ec6SMatthias Ringwald case SM_RESPONDER_PH4_LTK_GET_ENC: 24353deb3ec6SMatthias Ringwald // already busy? 24363deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_IDLE) { 24373deb3ec6SMatthias Ringwald sm_key_t d_prime; 24383deb3ec6SMatthias Ringwald sm_d1_d_prime(setup->sm_local_div, 0, d_prime); 24393deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24403deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_er, d_prime, connection); 24413deb3ec6SMatthias Ringwald return; 24423deb3ec6SMatthias Ringwald } 24433deb3ec6SMatthias Ringwald break; 24443deb3ec6SMatthias Ringwald 24453deb3ec6SMatthias Ringwald case SM_PH3_CSRK_GET_ENC: 24463deb3ec6SMatthias Ringwald // already busy? 24473deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_IDLE) { 24483deb3ec6SMatthias Ringwald sm_key_t d_prime; 24493deb3ec6SMatthias Ringwald sm_d1_d_prime(setup->sm_local_div, 1, d_prime); 24503deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24513deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_er, d_prime, connection); 24523deb3ec6SMatthias Ringwald return; 24533deb3ec6SMatthias Ringwald } 24543deb3ec6SMatthias Ringwald break; 24553deb3ec6SMatthias Ringwald 24563deb3ec6SMatthias Ringwald case SM_PH2_C1_GET_ENC_C: 24573deb3ec6SMatthias Ringwald // already busy? 24583deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 24593deb3ec6SMatthias Ringwald // calculate m_confirm using aes128 engine - step 1 24603deb3ec6SMatthias Ringwald sm_c1_t1(setup->sm_peer_random, (uint8_t*) &setup->sm_m_preq, (uint8_t*) &setup->sm_s_pres, setup->sm_m_addr_type, setup->sm_s_addr_type, plaintext); 24613deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24623deb3ec6SMatthias Ringwald sm_aes128_start(setup->sm_tk, plaintext, connection); 24633deb3ec6SMatthias Ringwald break; 24643deb3ec6SMatthias Ringwald case SM_PH2_C1_GET_ENC_A: 24653deb3ec6SMatthias Ringwald // already busy? 24663deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 24673deb3ec6SMatthias Ringwald // calculate confirm using aes128 engine - step 1 24683deb3ec6SMatthias Ringwald sm_c1_t1(setup->sm_local_random, (uint8_t*) &setup->sm_m_preq, (uint8_t*) &setup->sm_s_pres, setup->sm_m_addr_type, setup->sm_s_addr_type, plaintext); 24693deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24703deb3ec6SMatthias Ringwald sm_aes128_start(setup->sm_tk, plaintext, connection); 24713deb3ec6SMatthias Ringwald break; 24723deb3ec6SMatthias Ringwald case SM_PH2_CALC_STK: 24733deb3ec6SMatthias Ringwald // already busy? 24743deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 24753deb3ec6SMatthias Ringwald // calculate STK 247642134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 24773deb3ec6SMatthias Ringwald sm_s1_r_prime(setup->sm_local_random, setup->sm_peer_random, plaintext); 24783deb3ec6SMatthias Ringwald } else { 24793deb3ec6SMatthias Ringwald sm_s1_r_prime(setup->sm_peer_random, setup->sm_local_random, plaintext); 24803deb3ec6SMatthias Ringwald } 24813deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24823deb3ec6SMatthias Ringwald sm_aes128_start(setup->sm_tk, plaintext, connection); 24833deb3ec6SMatthias Ringwald break; 24843deb3ec6SMatthias Ringwald case SM_PH3_Y_GET_ENC: 24853deb3ec6SMatthias Ringwald // already busy? 24863deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 24873deb3ec6SMatthias Ringwald // PH3B2 - calculate Y from - enc 24883deb3ec6SMatthias Ringwald // Y = dm(DHK, Rand) 24893deb3ec6SMatthias Ringwald sm_dm_r_prime(setup->sm_local_rand, plaintext); 24903deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 24913deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_dhk, plaintext, connection); 24923deb3ec6SMatthias Ringwald return; 24933deb3ec6SMatthias Ringwald case SM_PH2_C1_SEND_PAIRING_CONFIRM: { 24943deb3ec6SMatthias Ringwald uint8_t buffer[17]; 24953deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_PAIRING_CONFIRM; 24969c80e4ccSMatthias Ringwald reverse_128(setup->sm_local_confirm, &buffer[1]); 249742134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 24983deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH2_W4_PAIRING_RANDOM; 24993deb3ec6SMatthias Ringwald } else { 25003deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_PH2_W4_PAIRING_CONFIRM; 25013deb3ec6SMatthias Ringwald } 25023deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 25033deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 25043deb3ec6SMatthias Ringwald return; 25053deb3ec6SMatthias Ringwald } 250642134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 25073deb3ec6SMatthias Ringwald case SM_RESPONDER_PH2_SEND_LTK_REPLY: { 25083deb3ec6SMatthias Ringwald sm_key_t stk_flipped; 25099c80e4ccSMatthias Ringwald reverse_128(setup->sm_ltk, stk_flipped); 25103deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_W4_CONNECTION_ENCRYPTED; 25113deb3ec6SMatthias Ringwald hci_send_cmd(&hci_le_long_term_key_request_reply, connection->sm_handle, stk_flipped); 25123deb3ec6SMatthias Ringwald return; 25133deb3ec6SMatthias Ringwald } 2514d7471931SMatthias Ringwald case SM_RESPONDER_PH4_SEND_LTK_REPLY: { 25153deb3ec6SMatthias Ringwald sm_key_t ltk_flipped; 25169c80e4ccSMatthias Ringwald reverse_128(setup->sm_ltk, ltk_flipped); 25173deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_IDLE; 25183deb3ec6SMatthias Ringwald hci_send_cmd(&hci_le_long_term_key_request_reply, connection->sm_handle, ltk_flipped); 25193deb3ec6SMatthias Ringwald return; 25203deb3ec6SMatthias Ringwald } 25213deb3ec6SMatthias Ringwald case SM_RESPONDER_PH4_Y_GET_ENC: 25223deb3ec6SMatthias Ringwald // already busy? 25233deb3ec6SMatthias Ringwald if (sm_aes128_state == SM_AES128_ACTIVE) break; 25243deb3ec6SMatthias Ringwald log_info("LTK Request: recalculating with ediv 0x%04x", setup->sm_local_ediv); 25253deb3ec6SMatthias Ringwald // Y = dm(DHK, Rand) 25263deb3ec6SMatthias Ringwald sm_dm_r_prime(setup->sm_local_rand, plaintext); 25273deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 25283deb3ec6SMatthias Ringwald sm_aes128_start(sm_persistent_dhk, plaintext, connection); 25293deb3ec6SMatthias Ringwald return; 253042134bc6SMatthias Ringwald #endif 253142134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 253242134bc6SMatthias Ringwald case SM_INITIATOR_PH3_SEND_START_ENCRYPTION: { 253342134bc6SMatthias Ringwald sm_key_t stk_flipped; 253442134bc6SMatthias Ringwald reverse_128(setup->sm_ltk, stk_flipped); 253542134bc6SMatthias Ringwald connection->sm_engine_state = SM_PH2_W4_CONNECTION_ENCRYPTED; 253642134bc6SMatthias Ringwald hci_send_cmd(&hci_le_start_encryption, connection->sm_handle, 0, 0, 0, stk_flipped); 253742134bc6SMatthias Ringwald return; 253842134bc6SMatthias Ringwald } 253942134bc6SMatthias Ringwald #endif 25403deb3ec6SMatthias Ringwald 25413deb3ec6SMatthias Ringwald case SM_PH3_DISTRIBUTE_KEYS: 25423deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set & SM_KEYDIST_FLAG_ENCRYPTION_INFORMATION){ 25433deb3ec6SMatthias Ringwald setup->sm_key_distribution_send_set &= ~SM_KEYDIST_FLAG_ENCRYPTION_INFORMATION; 25443deb3ec6SMatthias Ringwald uint8_t buffer[17]; 25453deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_ENCRYPTION_INFORMATION; 25469c80e4ccSMatthias Ringwald reverse_128(setup->sm_ltk, &buffer[1]); 25473deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 25483deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 25493deb3ec6SMatthias Ringwald return; 25503deb3ec6SMatthias Ringwald } 25513deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set & SM_KEYDIST_FLAG_MASTER_IDENTIFICATION){ 25523deb3ec6SMatthias Ringwald setup->sm_key_distribution_send_set &= ~SM_KEYDIST_FLAG_MASTER_IDENTIFICATION; 25533deb3ec6SMatthias Ringwald uint8_t buffer[11]; 25543deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_MASTER_IDENTIFICATION; 2555f8fbdce0SMatthias Ringwald little_endian_store_16(buffer, 1, setup->sm_local_ediv); 25569c80e4ccSMatthias Ringwald reverse_64(setup->sm_local_rand, &buffer[3]); 25573deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 25583deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 25593deb3ec6SMatthias Ringwald return; 25603deb3ec6SMatthias Ringwald } 25613deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set & SM_KEYDIST_FLAG_IDENTITY_INFORMATION){ 25623deb3ec6SMatthias Ringwald setup->sm_key_distribution_send_set &= ~SM_KEYDIST_FLAG_IDENTITY_INFORMATION; 25633deb3ec6SMatthias Ringwald uint8_t buffer[17]; 25643deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_IDENTITY_INFORMATION; 25659c80e4ccSMatthias Ringwald reverse_128(sm_persistent_irk, &buffer[1]); 25663deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 25673deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 25683deb3ec6SMatthias Ringwald return; 25693deb3ec6SMatthias Ringwald } 25703deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set & SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION){ 25713deb3ec6SMatthias Ringwald setup->sm_key_distribution_send_set &= ~SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION; 25723deb3ec6SMatthias Ringwald bd_addr_t local_address; 25733deb3ec6SMatthias Ringwald uint8_t buffer[8]; 25743deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_IDENTITY_ADDRESS_INFORMATION; 2575*4cd5c7b4SMatthias Ringwald switch (gap_random_address_get_mode()){ 2576*4cd5c7b4SMatthias Ringwald case GAP_RANDOM_ADDRESS_TYPE_OFF: 2577*4cd5c7b4SMatthias Ringwald case GAP_RANDOM_ADDRESS_TYPE_STATIC: 2578*4cd5c7b4SMatthias Ringwald // public or static random 2579b95a5a35SMatthias Ringwald gap_le_get_own_address(&buffer[1], local_address); 2580*4cd5c7b4SMatthias Ringwald break; 2581*4cd5c7b4SMatthias Ringwald case GAP_RANDOM_ADDRESS_NON_RESOLVABLE: 2582*4cd5c7b4SMatthias Ringwald case GAP_RANDOM_ADDRESS_RESOLVABLE: 2583*4cd5c7b4SMatthias Ringwald // fallback to public 2584*4cd5c7b4SMatthias Ringwald gap_local_bd_addr(local_address); 2585*4cd5c7b4SMatthias Ringwald buffer[1] = 0; 2586*4cd5c7b4SMatthias Ringwald break; 2587*4cd5c7b4SMatthias Ringwald } 2588724d70a2SMatthias Ringwald reverse_bd_addr(local_address, &buffer[2]); 25893deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 25903deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 25913deb3ec6SMatthias Ringwald return; 25923deb3ec6SMatthias Ringwald } 25933deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set & SM_KEYDIST_FLAG_SIGNING_IDENTIFICATION){ 25943deb3ec6SMatthias Ringwald setup->sm_key_distribution_send_set &= ~SM_KEYDIST_FLAG_SIGNING_IDENTIFICATION; 25953deb3ec6SMatthias Ringwald 25963deb3ec6SMatthias Ringwald // hack to reproduce test runs 25973deb3ec6SMatthias Ringwald if (test_use_fixed_local_csrk){ 25983deb3ec6SMatthias Ringwald memset(setup->sm_local_csrk, 0xcc, 16); 25993deb3ec6SMatthias Ringwald } 26003deb3ec6SMatthias Ringwald 26013deb3ec6SMatthias Ringwald uint8_t buffer[17]; 26023deb3ec6SMatthias Ringwald buffer[0] = SM_CODE_SIGNING_INFORMATION; 26039c80e4ccSMatthias Ringwald reverse_128(setup->sm_local_csrk, &buffer[1]); 26043deb3ec6SMatthias Ringwald l2cap_send_connectionless(connection->sm_handle, L2CAP_CID_SECURITY_MANAGER_PROTOCOL, (uint8_t*) buffer, sizeof(buffer)); 26053deb3ec6SMatthias Ringwald sm_timeout_reset(connection); 26063deb3ec6SMatthias Ringwald return; 26073deb3ec6SMatthias Ringwald } 26083deb3ec6SMatthias Ringwald 26093deb3ec6SMatthias Ringwald // keys are sent 261042134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 26113deb3ec6SMatthias Ringwald // slave -> receive master keys if any 26123deb3ec6SMatthias Ringwald if (sm_key_distribution_all_received(connection)){ 26133deb3ec6SMatthias Ringwald sm_key_distribution_handle_all_received(connection); 26143deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_IDLE; 26153deb3ec6SMatthias Ringwald sm_done_for_handle(connection->sm_handle); 26163deb3ec6SMatthias Ringwald } else { 26173deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_RECEIVE_KEYS; 26183deb3ec6SMatthias Ringwald } 26193deb3ec6SMatthias Ringwald } else { 26203deb3ec6SMatthias Ringwald // master -> all done 26213deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_CONNECTED; 26223deb3ec6SMatthias Ringwald sm_done_for_handle(connection->sm_handle); 26233deb3ec6SMatthias Ringwald } 26243deb3ec6SMatthias Ringwald break; 26253deb3ec6SMatthias Ringwald 26263deb3ec6SMatthias Ringwald default: 26273deb3ec6SMatthias Ringwald break; 26283deb3ec6SMatthias Ringwald } 26293deb3ec6SMatthias Ringwald 26303deb3ec6SMatthias Ringwald // check again if active connection was released 26317149bde5SMatthias Ringwald if (sm_active_connection_handle != HCI_CON_HANDLE_INVALID) break; 26323deb3ec6SMatthias Ringwald } 26333deb3ec6SMatthias Ringwald } 26343deb3ec6SMatthias Ringwald 26353deb3ec6SMatthias Ringwald // note: aes engine is ready as we just got the aes result 26363deb3ec6SMatthias Ringwald static void sm_handle_encryption_result(uint8_t * data){ 26373deb3ec6SMatthias Ringwald 26383deb3ec6SMatthias Ringwald sm_aes128_state = SM_AES128_IDLE; 26393deb3ec6SMatthias Ringwald 26403deb3ec6SMatthias Ringwald if (sm_address_resolution_ah_calculation_active){ 26413deb3ec6SMatthias Ringwald sm_address_resolution_ah_calculation_active = 0; 26423deb3ec6SMatthias Ringwald // compare calulated address against connecting device 26433deb3ec6SMatthias Ringwald uint8_t hash[3]; 26449c80e4ccSMatthias Ringwald reverse_24(data, hash); 26453deb3ec6SMatthias Ringwald if (memcmp(&sm_address_resolution_address[3], hash, 3) == 0){ 26463deb3ec6SMatthias Ringwald log_info("LE Device Lookup: matched resolvable private address"); 26473deb3ec6SMatthias Ringwald sm_address_resolution_handle_event(ADDRESS_RESOLUTION_SUCEEDED); 26483deb3ec6SMatthias Ringwald return; 26493deb3ec6SMatthias Ringwald } 26503deb3ec6SMatthias Ringwald // no match, try next 26513deb3ec6SMatthias Ringwald sm_address_resolution_test++; 26523deb3ec6SMatthias Ringwald return; 26533deb3ec6SMatthias Ringwald } 26543deb3ec6SMatthias Ringwald 26553deb3ec6SMatthias Ringwald switch (dkg_state){ 26563deb3ec6SMatthias Ringwald case DKG_W4_IRK: 26579c80e4ccSMatthias Ringwald reverse_128(data, sm_persistent_irk); 26588314c363SMatthias Ringwald log_info_key("irk", sm_persistent_irk); 26593deb3ec6SMatthias Ringwald dkg_next_state(); 26603deb3ec6SMatthias Ringwald return; 26613deb3ec6SMatthias Ringwald case DKG_W4_DHK: 26629c80e4ccSMatthias Ringwald reverse_128(data, sm_persistent_dhk); 26638314c363SMatthias Ringwald log_info_key("dhk", sm_persistent_dhk); 26643deb3ec6SMatthias Ringwald dkg_next_state(); 26656f792faaSMatthias Ringwald // SM Init Finished 26663deb3ec6SMatthias Ringwald return; 26673deb3ec6SMatthias Ringwald default: 26683deb3ec6SMatthias Ringwald break; 26693deb3ec6SMatthias Ringwald } 26703deb3ec6SMatthias Ringwald 26713deb3ec6SMatthias Ringwald switch (rau_state){ 26723deb3ec6SMatthias Ringwald case RAU_W4_ENC: 26739c80e4ccSMatthias Ringwald reverse_24(data, &sm_random_address[3]); 26743deb3ec6SMatthias Ringwald rau_next_state(); 26753deb3ec6SMatthias Ringwald return; 26763deb3ec6SMatthias Ringwald default: 26773deb3ec6SMatthias Ringwald break; 26783deb3ec6SMatthias Ringwald } 26793deb3ec6SMatthias Ringwald 26807a766ebfSMatthias Ringwald #ifdef ENABLE_CMAC_ENGINE 26813deb3ec6SMatthias Ringwald switch (sm_cmac_state){ 26823deb3ec6SMatthias Ringwald case CMAC_W4_SUBKEYS: 26833deb3ec6SMatthias Ringwald case CMAC_W4_MI: 26843deb3ec6SMatthias Ringwald case CMAC_W4_MLAST: 26853deb3ec6SMatthias Ringwald { 26863deb3ec6SMatthias Ringwald sm_key_t t; 26879c80e4ccSMatthias Ringwald reverse_128(data, t); 26883deb3ec6SMatthias Ringwald sm_cmac_handle_encryption_result(t); 26893deb3ec6SMatthias Ringwald } 26903deb3ec6SMatthias Ringwald return; 26913deb3ec6SMatthias Ringwald default: 26923deb3ec6SMatthias Ringwald break; 26933deb3ec6SMatthias Ringwald } 26947a766ebfSMatthias Ringwald #endif 26953deb3ec6SMatthias Ringwald 26963deb3ec6SMatthias Ringwald // retrieve sm_connection provided to sm_aes128_start_encryption 26973deb3ec6SMatthias Ringwald sm_connection_t * connection = (sm_connection_t*) sm_aes128_context; 26983deb3ec6SMatthias Ringwald if (!connection) return; 26993deb3ec6SMatthias Ringwald switch (connection->sm_engine_state){ 27003deb3ec6SMatthias Ringwald case SM_PH2_C1_W4_ENC_A: 27013deb3ec6SMatthias Ringwald case SM_PH2_C1_W4_ENC_C: 27023deb3ec6SMatthias Ringwald { 27033deb3ec6SMatthias Ringwald sm_key_t t2; 27049c80e4ccSMatthias Ringwald reverse_128(data, t2); 27053deb3ec6SMatthias Ringwald sm_c1_t3(t2, setup->sm_m_address, setup->sm_s_address, setup->sm_c1_t3_value); 27063deb3ec6SMatthias Ringwald } 27073deb3ec6SMatthias Ringwald sm_next_responding_state(connection); 27083deb3ec6SMatthias Ringwald return; 27093deb3ec6SMatthias Ringwald case SM_PH2_C1_W4_ENC_B: 27109c80e4ccSMatthias Ringwald reverse_128(data, setup->sm_local_confirm); 27118314c363SMatthias Ringwald log_info_key("c1!", setup->sm_local_confirm); 27123deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_C1_SEND_PAIRING_CONFIRM; 27133deb3ec6SMatthias Ringwald return; 27143deb3ec6SMatthias Ringwald case SM_PH2_C1_W4_ENC_D: 27153deb3ec6SMatthias Ringwald { 27163deb3ec6SMatthias Ringwald sm_key_t peer_confirm_test; 27179c80e4ccSMatthias Ringwald reverse_128(data, peer_confirm_test); 27188314c363SMatthias Ringwald log_info_key("c1!", peer_confirm_test); 27193deb3ec6SMatthias Ringwald if (memcmp(setup->sm_peer_confirm, peer_confirm_test, 16) != 0){ 27203deb3ec6SMatthias Ringwald setup->sm_pairing_failed_reason = SM_REASON_CONFIRM_VALUE_FAILED; 27213deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_GENERAL_SEND_PAIRING_FAILED; 27223deb3ec6SMatthias Ringwald return; 27233deb3ec6SMatthias Ringwald } 272442134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 27253deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_SEND_PAIRING_RANDOM; 27263deb3ec6SMatthias Ringwald } else { 27273deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_CALC_STK; 27283deb3ec6SMatthias Ringwald } 27293deb3ec6SMatthias Ringwald } 27303deb3ec6SMatthias Ringwald return; 27313deb3ec6SMatthias Ringwald case SM_PH2_W4_STK: 27329c80e4ccSMatthias Ringwald reverse_128(data, setup->sm_ltk); 27333deb3ec6SMatthias Ringwald sm_truncate_key(setup->sm_ltk, connection->sm_actual_encryption_key_size); 27348314c363SMatthias Ringwald log_info_key("stk", setup->sm_ltk); 273542134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 27363deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH2_SEND_LTK_REPLY; 27373deb3ec6SMatthias Ringwald } else { 27383deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_PH3_SEND_START_ENCRYPTION; 27393deb3ec6SMatthias Ringwald } 27403deb3ec6SMatthias Ringwald return; 27413deb3ec6SMatthias Ringwald case SM_PH3_Y_W4_ENC:{ 27423deb3ec6SMatthias Ringwald sm_key_t y128; 27439c80e4ccSMatthias Ringwald reverse_128(data, y128); 2744f8fbdce0SMatthias Ringwald setup->sm_local_y = big_endian_read_16(y128, 14); 27453deb3ec6SMatthias Ringwald log_info_hex16("y", setup->sm_local_y); 27463deb3ec6SMatthias Ringwald // PH3B3 - calculate EDIV 27473deb3ec6SMatthias Ringwald setup->sm_local_ediv = setup->sm_local_y ^ setup->sm_local_div; 27483deb3ec6SMatthias Ringwald log_info_hex16("ediv", setup->sm_local_ediv); 27493deb3ec6SMatthias Ringwald // PH3B4 - calculate LTK - enc 27503deb3ec6SMatthias Ringwald // LTK = d1(ER, DIV, 0)) 27513deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_LTK_GET_ENC; 27523deb3ec6SMatthias Ringwald return; 27533deb3ec6SMatthias Ringwald } 27543deb3ec6SMatthias Ringwald case SM_RESPONDER_PH4_Y_W4_ENC:{ 27553deb3ec6SMatthias Ringwald sm_key_t y128; 27569c80e4ccSMatthias Ringwald reverse_128(data, y128); 2757f8fbdce0SMatthias Ringwald setup->sm_local_y = big_endian_read_16(y128, 14); 27583deb3ec6SMatthias Ringwald log_info_hex16("y", setup->sm_local_y); 27593deb3ec6SMatthias Ringwald 27603deb3ec6SMatthias Ringwald // PH3B3 - calculate DIV 27613deb3ec6SMatthias Ringwald setup->sm_local_div = setup->sm_local_y ^ setup->sm_local_ediv; 27623deb3ec6SMatthias Ringwald log_info_hex16("ediv", setup->sm_local_ediv); 27633deb3ec6SMatthias Ringwald // PH3B4 - calculate LTK - enc 27643deb3ec6SMatthias Ringwald // LTK = d1(ER, DIV, 0)) 27653deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH4_LTK_GET_ENC; 27663deb3ec6SMatthias Ringwald return; 27673deb3ec6SMatthias Ringwald } 27683deb3ec6SMatthias Ringwald case SM_PH3_LTK_W4_ENC: 27699c80e4ccSMatthias Ringwald reverse_128(data, setup->sm_ltk); 27708314c363SMatthias Ringwald log_info_key("ltk", setup->sm_ltk); 27713deb3ec6SMatthias Ringwald // calc CSRK next 27723deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_CSRK_GET_ENC; 27733deb3ec6SMatthias Ringwald return; 27743deb3ec6SMatthias Ringwald case SM_PH3_CSRK_W4_ENC: 27759c80e4ccSMatthias Ringwald reverse_128(data, setup->sm_local_csrk); 27768314c363SMatthias Ringwald log_info_key("csrk", setup->sm_local_csrk); 27773deb3ec6SMatthias Ringwald if (setup->sm_key_distribution_send_set){ 27783deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_DISTRIBUTE_KEYS; 27793deb3ec6SMatthias Ringwald } else { 27803deb3ec6SMatthias Ringwald // no keys to send, just continue 278142134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 27823deb3ec6SMatthias Ringwald // slave -> receive master keys 27833deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_RECEIVE_KEYS; 27843deb3ec6SMatthias Ringwald } else { 27852bacf595SMatthias Ringwald if (setup->sm_use_secure_connections && (setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION)){ 27862bacf595SMatthias Ringwald connection->sm_engine_state = SM_SC_W2_CALCULATE_H6_ILK; 27872bacf595SMatthias Ringwald } else { 27883deb3ec6SMatthias Ringwald // master -> all done 27893deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_INITIATOR_CONNECTED; 27903deb3ec6SMatthias Ringwald sm_done_for_handle(connection->sm_handle); 27913deb3ec6SMatthias Ringwald } 27923deb3ec6SMatthias Ringwald } 27932bacf595SMatthias Ringwald } 27943deb3ec6SMatthias Ringwald return; 279542134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 27963deb3ec6SMatthias Ringwald case SM_RESPONDER_PH4_LTK_W4_ENC: 27979c80e4ccSMatthias Ringwald reverse_128(data, setup->sm_ltk); 27983deb3ec6SMatthias Ringwald sm_truncate_key(setup->sm_ltk, connection->sm_actual_encryption_key_size); 27998314c363SMatthias Ringwald log_info_key("ltk", setup->sm_ltk); 2800d7471931SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH4_SEND_LTK_REPLY; 28013deb3ec6SMatthias Ringwald return; 280242134bc6SMatthias Ringwald #endif 28033deb3ec6SMatthias Ringwald default: 28043deb3ec6SMatthias Ringwald break; 28053deb3ec6SMatthias Ringwald } 28063deb3ec6SMatthias Ringwald } 28073deb3ec6SMatthias Ringwald 280888011322SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 2809c692d776SMatthias Ringwald #ifndef HAVE_HCI_CONTROLLER_DHKEY_SUPPORT 28100c92bcc6SMatthias Ringwald #if !defined(WICED_VERSION) 28115198fffaSMatthias Ringwald // @return OK 2812c692d776SMatthias Ringwald static int sm_generate_f_rng(unsigned char * buffer, unsigned size){ 28135198fffaSMatthias Ringwald if (ec_key_generation_state != EC_KEY_GENERATION_ACTIVE) return 0; 28147df18c15SMatthias Ringwald int offset = setup->sm_passkey_bit; 28157df18c15SMatthias Ringwald log_info("sm_generate_f_rng: size %u - offset %u", (int) size, offset); 28167df18c15SMatthias Ringwald while (size) { 2817fc5bff5fSMatthias Ringwald *buffer++ = setup->sm_peer_q[offset++]; 28187df18c15SMatthias Ringwald size--; 28197df18c15SMatthias Ringwald } 28207df18c15SMatthias Ringwald setup->sm_passkey_bit = offset; 28215198fffaSMatthias Ringwald return 1; 28227df18c15SMatthias Ringwald } 2823cdb8bfaeSMatthias Ringwald #endif 28247df18c15SMatthias Ringwald #endif 282588011322SMatthias Ringwald #endif 28267df18c15SMatthias Ringwald 28273deb3ec6SMatthias Ringwald // note: random generator is ready. this doesn NOT imply that aes engine is unused! 28283deb3ec6SMatthias Ringwald static void sm_handle_random_result(uint8_t * data){ 28293deb3ec6SMatthias Ringwald 283088011322SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 2831c692d776SMatthias Ringwald #ifndef HAVE_HCI_CONTROLLER_DHKEY_SUPPORT 2832c692d776SMatthias Ringwald 28337df18c15SMatthias Ringwald if (ec_key_generation_state == EC_KEY_GENERATION_ACTIVE){ 28347df18c15SMatthias Ringwald int num_bytes = setup->sm_passkey_bit; 2835fc5bff5fSMatthias Ringwald memcpy(&setup->sm_peer_q[num_bytes], data, 8); 28367df18c15SMatthias Ringwald num_bytes += 8; 28377df18c15SMatthias Ringwald setup->sm_passkey_bit = num_bytes; 28387df18c15SMatthias Ringwald 28397df18c15SMatthias Ringwald if (num_bytes >= 64){ 2840ae4aa2b6SMatthias Ringwald 2841c692d776SMatthias Ringwald // init pre-generated random data from sm_peer_q 28427df18c15SMatthias Ringwald setup->sm_passkey_bit = 0; 2843c692d776SMatthias Ringwald 2844c692d776SMatthias Ringwald // generate EC key 2845c692d776SMatthias Ringwald #ifdef USE_MICROECC_FOR_ECDH 2846cdb8bfaeSMatthias Ringwald #ifndef WICED_VERSION 28478974e43fSMatthias Ringwald log_info("set uECC RNG for initial key generation with 64 random bytes"); 28487149bde5SMatthias Ringwald // micro-ecc from WICED SDK uses its wiced_crypto_get_random by default - no need to set it 2849c692d776SMatthias Ringwald uECC_set_rng(&sm_generate_f_rng); 28507149bde5SMatthias Ringwald #endif /* WICED_VERSION */ 28514b8ec5bcSMatthias Ringwald 28524b8ec5bcSMatthias Ringwald #if uECC_SUPPORTS_secp256r1 28534b8ec5bcSMatthias Ringwald // standard version 28544b8ec5bcSMatthias Ringwald uECC_make_key(ec_q, ec_d, uECC_secp256r1()); 2855e6343eb6SMatthias Ringwald 2856e6343eb6SMatthias Ringwald // disable RNG again, as returning no randmon data lets shared key generation fail 2857e6343eb6SMatthias Ringwald log_info("disable uECC RNG in standard version after key generation"); 2858e6343eb6SMatthias Ringwald uECC_set_rng(NULL); 28594b8ec5bcSMatthias Ringwald #else 28604b8ec5bcSMatthias Ringwald // static version 2861c692d776SMatthias Ringwald uECC_make_key(ec_q, ec_d); 2862add51d72SMatthias Ringwald #endif /* USE_MICROECC_FOR_ECDH */ 28634b8ec5bcSMatthias Ringwald 28647149bde5SMatthias Ringwald #endif /* USE_MICROECC_FOR_ECDH */ 28657df18c15SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_DONE; 286609e4d397SMatthias Ringwald log_info("Elliptic curve: d"); 286709e4d397SMatthias Ringwald log_info_hexdump(ec_d,32); 28682e6217a0SMatthias Ringwald sm_log_ec_keypair(); 28697df18c15SMatthias Ringwald } 28707df18c15SMatthias Ringwald } 28717df18c15SMatthias Ringwald #endif 287288011322SMatthias Ringwald #endif 28737df18c15SMatthias Ringwald 28743deb3ec6SMatthias Ringwald switch (rau_state){ 28753deb3ec6SMatthias Ringwald case RAU_W4_RANDOM: 28763deb3ec6SMatthias Ringwald // non-resolvable vs. resolvable 28773deb3ec6SMatthias Ringwald switch (gap_random_adress_type){ 28783deb3ec6SMatthias Ringwald case GAP_RANDOM_ADDRESS_RESOLVABLE: 28793deb3ec6SMatthias Ringwald // resolvable: use random as prand and calc address hash 28803deb3ec6SMatthias Ringwald // "The two most significant bits of prand shall be equal to ‘0’ and ‘1" 28813deb3ec6SMatthias Ringwald memcpy(sm_random_address, data, 3); 28823deb3ec6SMatthias Ringwald sm_random_address[0] &= 0x3f; 28833deb3ec6SMatthias Ringwald sm_random_address[0] |= 0x40; 28843deb3ec6SMatthias Ringwald rau_state = RAU_GET_ENC; 28853deb3ec6SMatthias Ringwald break; 28863deb3ec6SMatthias Ringwald case GAP_RANDOM_ADDRESS_NON_RESOLVABLE: 28873deb3ec6SMatthias Ringwald default: 28883deb3ec6SMatthias Ringwald // "The two most significant bits of the address shall be equal to ‘0’"" 28893deb3ec6SMatthias Ringwald memcpy(sm_random_address, data, 6); 28903deb3ec6SMatthias Ringwald sm_random_address[0] &= 0x3f; 28913deb3ec6SMatthias Ringwald rau_state = RAU_SET_ADDRESS; 28923deb3ec6SMatthias Ringwald break; 28933deb3ec6SMatthias Ringwald } 28943deb3ec6SMatthias Ringwald return; 28953deb3ec6SMatthias Ringwald default: 28963deb3ec6SMatthias Ringwald break; 28973deb3ec6SMatthias Ringwald } 28983deb3ec6SMatthias Ringwald 28993deb3ec6SMatthias Ringwald // retrieve sm_connection provided to sm_random_start 29003deb3ec6SMatthias Ringwald sm_connection_t * connection = (sm_connection_t *) sm_random_context; 29013deb3ec6SMatthias Ringwald if (!connection) return; 29023deb3ec6SMatthias Ringwald switch (connection->sm_engine_state){ 2903f1c1783eSMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 2904f1c1783eSMatthias Ringwald case SM_SC_W4_GET_RANDOM_A: 2905f1c1783eSMatthias Ringwald memcpy(&setup->sm_local_nonce[0], data, 8); 2906f1c1783eSMatthias Ringwald connection->sm_engine_state = SM_SC_W2_GET_RANDOM_B; 2907f1c1783eSMatthias Ringwald break; 2908f1c1783eSMatthias Ringwald case SM_SC_W4_GET_RANDOM_B: 2909f1c1783eSMatthias Ringwald memcpy(&setup->sm_local_nonce[8], data, 8); 2910f1c1783eSMatthias Ringwald // initiator & jw/nc -> send pairing random 2911f1c1783eSMatthias Ringwald if (connection->sm_role == 0 && sm_just_works_or_numeric_comparison(setup->sm_stk_generation_method)){ 2912f1c1783eSMatthias Ringwald connection->sm_engine_state = SM_SC_SEND_PAIRING_RANDOM; 2913f1c1783eSMatthias Ringwald break; 2914b35a3de2SMatthias Ringwald } else { 2915b35a3de2SMatthias Ringwald connection->sm_engine_state = SM_SC_W2_CMAC_FOR_CONFIRMATION; 2916f1c1783eSMatthias Ringwald } 2917f1c1783eSMatthias Ringwald break; 2918f1c1783eSMatthias Ringwald #endif 2919f1c1783eSMatthias Ringwald 29203deb3ec6SMatthias Ringwald case SM_PH2_W4_RANDOM_TK: 29213deb3ec6SMatthias Ringwald { 29223deb3ec6SMatthias Ringwald // map random to 0-999999 without speding much cycles on a modulus operation 2923f8fbdce0SMatthias Ringwald uint32_t tk = little_endian_read_32(data,0); 29243deb3ec6SMatthias Ringwald tk = tk & 0xfffff; // 1048575 29253deb3ec6SMatthias Ringwald if (tk >= 999999){ 29263deb3ec6SMatthias Ringwald tk = tk - 999999; 29273deb3ec6SMatthias Ringwald } 29283deb3ec6SMatthias Ringwald sm_reset_tk(); 2929f8fbdce0SMatthias Ringwald big_endian_store_32(setup->sm_tk, 12, tk); 293042134bc6SMatthias Ringwald if (IS_RESPONDER(connection->sm_role)){ 29313deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_RESPONDER_PH1_SEND_PAIRING_RESPONSE; 29323deb3ec6SMatthias Ringwald } else { 2933b41539d5SMatthias Ringwald if (setup->sm_use_secure_connections){ 2934b41539d5SMatthias Ringwald connection->sm_engine_state = SM_SC_SEND_PUBLIC_KEY_COMMAND; 2935b41539d5SMatthias Ringwald } else { 29363deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH1_W4_USER_RESPONSE; 29373deb3ec6SMatthias Ringwald sm_trigger_user_response(connection); 29383deb3ec6SMatthias Ringwald // response_idle == nothing <--> sm_trigger_user_response() did not require response 29393deb3ec6SMatthias Ringwald if (setup->sm_user_response == SM_USER_RESPONSE_IDLE){ 29403deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_C1_GET_RANDOM_A; 29413deb3ec6SMatthias Ringwald } 29423deb3ec6SMatthias Ringwald } 2943b41539d5SMatthias Ringwald } 29443deb3ec6SMatthias Ringwald return; 29453deb3ec6SMatthias Ringwald } 29463deb3ec6SMatthias Ringwald case SM_PH2_C1_W4_RANDOM_A: 29473deb3ec6SMatthias Ringwald memcpy(&setup->sm_local_random[0], data, 8); // random endinaness 29483deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_C1_GET_RANDOM_B; 29493deb3ec6SMatthias Ringwald return; 29503deb3ec6SMatthias Ringwald case SM_PH2_C1_W4_RANDOM_B: 29513deb3ec6SMatthias Ringwald memcpy(&setup->sm_local_random[8], data, 8); // random endinaness 29523deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH2_C1_GET_ENC_A; 29533deb3ec6SMatthias Ringwald return; 29543deb3ec6SMatthias Ringwald case SM_PH3_W4_RANDOM: 29559c80e4ccSMatthias Ringwald reverse_64(data, setup->sm_local_rand); 29563deb3ec6SMatthias Ringwald // no db for encryption size hack: encryption size is stored in lowest nibble of setup->sm_local_rand 29573deb3ec6SMatthias Ringwald setup->sm_local_rand[7] = (setup->sm_local_rand[7] & 0xf0) + (connection->sm_actual_encryption_key_size - 1); 29583deb3ec6SMatthias Ringwald // no db for authenticated flag hack: store flag in bit 4 of LSB 29593deb3ec6SMatthias Ringwald setup->sm_local_rand[7] = (setup->sm_local_rand[7] & 0xef) + (connection->sm_connection_authenticated << 4); 29603deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_GET_DIV; 29613deb3ec6SMatthias Ringwald return; 29623deb3ec6SMatthias Ringwald case SM_PH3_W4_DIV: 29633deb3ec6SMatthias Ringwald // use 16 bit from random value as div 2964f8fbdce0SMatthias Ringwald setup->sm_local_div = big_endian_read_16(data, 0); 29653deb3ec6SMatthias Ringwald log_info_hex16("div", setup->sm_local_div); 29663deb3ec6SMatthias Ringwald connection->sm_engine_state = SM_PH3_Y_GET_ENC; 29673deb3ec6SMatthias Ringwald return; 29683deb3ec6SMatthias Ringwald default: 29693deb3ec6SMatthias Ringwald break; 29703deb3ec6SMatthias Ringwald } 29713deb3ec6SMatthias Ringwald } 29723deb3ec6SMatthias Ringwald 2973d9a7306aSMatthias Ringwald static void sm_event_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 29743deb3ec6SMatthias Ringwald 29759ec2630cSMatthias Ringwald UNUSED(channel); 29769ec2630cSMatthias Ringwald UNUSED(size); 29779ec2630cSMatthias Ringwald 29783deb3ec6SMatthias Ringwald sm_connection_t * sm_conn; 2979711e6c80SMatthias Ringwald hci_con_handle_t con_handle; 29803deb3ec6SMatthias Ringwald 29813deb3ec6SMatthias Ringwald switch (packet_type) { 29823deb3ec6SMatthias Ringwald 29833deb3ec6SMatthias Ringwald case HCI_EVENT_PACKET: 29840e2df43fSMatthias Ringwald switch (hci_event_packet_get_type(packet)) { 29853deb3ec6SMatthias Ringwald 29863deb3ec6SMatthias Ringwald case BTSTACK_EVENT_STATE: 29873deb3ec6SMatthias Ringwald // bt stack activated, get started 2988be7cc9a0SMilanka Ringwald if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 29893deb3ec6SMatthias Ringwald log_info("HCI Working!"); 2990f33ad81dSMatthias Ringwald 2991f33ad81dSMatthias Ringwald // set local addr for le device db 2992f33ad81dSMatthias Ringwald bd_addr_t local_bd_addr; 2993f33ad81dSMatthias Ringwald gap_local_bd_addr(local_bd_addr); 2994f33ad81dSMatthias Ringwald le_device_db_set_local_bd_addr(local_bd_addr); 2995f33ad81dSMatthias Ringwald 29963deb3ec6SMatthias Ringwald dkg_state = sm_persistent_irk_ready ? DKG_CALC_DHK : DKG_CALC_IRK; 299709e4d397SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 2998df86eb96SMatthias Ringwald if (!sm_have_ec_keypair){ 29997df18c15SMatthias Ringwald setup->sm_passkey_bit = 0; 30007df18c15SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_ACTIVE; 30017df18c15SMatthias Ringwald } 30027df18c15SMatthias Ringwald #endif 300352b551c3SMatthias Ringwald // trigger Random Address generation if requested before 30048f57b085SMatthias Ringwald switch (gap_random_adress_type){ 30058f57b085SMatthias Ringwald case GAP_RANDOM_ADDRESS_TYPE_OFF: 300652b551c3SMatthias Ringwald rau_state = RAU_IDLE; 30078f57b085SMatthias Ringwald break; 30088f57b085SMatthias Ringwald case GAP_RANDOM_ADDRESS_TYPE_STATIC: 30098f57b085SMatthias Ringwald rau_state = RAU_SET_ADDRESS; 30108f57b085SMatthias Ringwald break; 30118f57b085SMatthias Ringwald default: 30125777861bSMatthias Ringwald rau_state = RAU_GET_RANDOM; 30138f57b085SMatthias Ringwald break; 301452b551c3SMatthias Ringwald } 30153deb3ec6SMatthias Ringwald sm_run(); 30163deb3ec6SMatthias Ringwald } 30173deb3ec6SMatthias Ringwald break; 30183deb3ec6SMatthias Ringwald 30193deb3ec6SMatthias Ringwald case HCI_EVENT_LE_META: 30203deb3ec6SMatthias Ringwald switch (packet[2]) { 30213deb3ec6SMatthias Ringwald case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 30223deb3ec6SMatthias Ringwald 30233deb3ec6SMatthias Ringwald log_info("sm: connected"); 30243deb3ec6SMatthias Ringwald 30253deb3ec6SMatthias Ringwald if (packet[3]) return; // connection failed 30263deb3ec6SMatthias Ringwald 3027711e6c80SMatthias Ringwald con_handle = little_endian_read_16(packet, 4); 3028711e6c80SMatthias Ringwald sm_conn = sm_get_connection_for_handle(con_handle); 30293deb3ec6SMatthias Ringwald if (!sm_conn) break; 30303deb3ec6SMatthias Ringwald 3031711e6c80SMatthias Ringwald sm_conn->sm_handle = con_handle; 30323deb3ec6SMatthias Ringwald sm_conn->sm_role = packet[6]; 30333deb3ec6SMatthias Ringwald sm_conn->sm_peer_addr_type = packet[7]; 303413377825SMatthias Ringwald reverse_bd_addr(&packet[8], sm_conn->sm_peer_address); 30353deb3ec6SMatthias Ringwald 30363deb3ec6SMatthias Ringwald log_info("New sm_conn, role %s", sm_conn->sm_role ? "slave" : "master"); 30373deb3ec6SMatthias Ringwald 30383deb3ec6SMatthias Ringwald // reset security properties 30393deb3ec6SMatthias Ringwald sm_conn->sm_connection_encrypted = 0; 30403deb3ec6SMatthias Ringwald sm_conn->sm_connection_authenticated = 0; 30413deb3ec6SMatthias Ringwald sm_conn->sm_connection_authorization_state = AUTHORIZATION_UNKNOWN; 30423deb3ec6SMatthias Ringwald sm_conn->sm_le_db_index = -1; 30433deb3ec6SMatthias Ringwald 30443deb3ec6SMatthias Ringwald // prepare CSRK lookup (does not involve setup) 30453deb3ec6SMatthias Ringwald sm_conn->sm_irk_lookup_state = IRK_LOOKUP_W4_READY; 30463deb3ec6SMatthias Ringwald 30473deb3ec6SMatthias Ringwald // just connected -> everything else happens in sm_run() 304842134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 30493deb3ec6SMatthias Ringwald // slave - state already could be SM_RESPONDER_SEND_SECURITY_REQUEST instead 30503deb3ec6SMatthias Ringwald if (sm_conn->sm_engine_state == SM_GENERAL_IDLE){ 30513deb3ec6SMatthias Ringwald if (sm_slave_request_security) { 30523deb3ec6SMatthias Ringwald // request security if requested by app 30533deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_SEND_SECURITY_REQUEST; 30543deb3ec6SMatthias Ringwald } else { 30553deb3ec6SMatthias Ringwald // otherwise, wait for pairing request 30563deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_IDLE; 30573deb3ec6SMatthias Ringwald } 30583deb3ec6SMatthias Ringwald } 30593deb3ec6SMatthias Ringwald break; 30603deb3ec6SMatthias Ringwald } else { 30613deb3ec6SMatthias Ringwald // master 30623deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_CONNECTED; 30633deb3ec6SMatthias Ringwald } 30643deb3ec6SMatthias Ringwald break; 30653deb3ec6SMatthias Ringwald 30663deb3ec6SMatthias Ringwald case HCI_SUBEVENT_LE_LONG_TERM_KEY_REQUEST: 3067711e6c80SMatthias Ringwald con_handle = little_endian_read_16(packet, 3); 3068711e6c80SMatthias Ringwald sm_conn = sm_get_connection_for_handle(con_handle); 30693deb3ec6SMatthias Ringwald if (!sm_conn) break; 30703deb3ec6SMatthias Ringwald 30713deb3ec6SMatthias Ringwald log_info("LTK Request: state %u", sm_conn->sm_engine_state); 30723deb3ec6SMatthias Ringwald if (sm_conn->sm_engine_state == SM_RESPONDER_PH2_W4_LTK_REQUEST){ 30733deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_CALC_STK; 30743deb3ec6SMatthias Ringwald break; 30753deb3ec6SMatthias Ringwald } 3076c6b7cbd9SMatthias Ringwald if (sm_conn->sm_engine_state == SM_SC_W4_LTK_REQUEST_SC){ 3077778b6aadSMatthias Ringwald // PH2 SEND LTK as we need to exchange keys in PH3 3078778b6aadSMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_PH2_SEND_LTK_REPLY; 3079e53be891SMatthias Ringwald break; 3080e53be891SMatthias Ringwald } 30813deb3ec6SMatthias Ringwald 30823deb3ec6SMatthias Ringwald // store rand and ediv 30839c80e4ccSMatthias Ringwald reverse_64(&packet[5], sm_conn->sm_local_rand); 3084f8fbdce0SMatthias Ringwald sm_conn->sm_local_ediv = little_endian_read_16(packet, 13); 3085549ad5d2SMatthias Ringwald 3086549ad5d2SMatthias Ringwald // For Legacy Pairing (<=> EDIV != 0 || RAND != NULL), we need to recalculated our LTK as a 3087549ad5d2SMatthias Ringwald // potentially stored LTK is from the master 3088549ad5d2SMatthias Ringwald if (sm_conn->sm_local_ediv != 0 || !sm_is_null_random(sm_conn->sm_local_rand)){ 308906cd539fSMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_PH0_RECEIVED_LTK_REQUEST; 3090549ad5d2SMatthias Ringwald break; 3091549ad5d2SMatthias Ringwald } 3092549ad5d2SMatthias Ringwald 3093549ad5d2SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 309406cd539fSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_RECEIVED_LTK_REQUEST; 3095549ad5d2SMatthias Ringwald #else 3096549ad5d2SMatthias Ringwald log_info("LTK Request: ediv & random are empty, but LE Secure Connections not supported"); 3097549ad5d2SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_PH0_SEND_LTK_REQUESTED_NEGATIVE_REPLY; 3098549ad5d2SMatthias Ringwald #endif 30993deb3ec6SMatthias Ringwald break; 3100804d3e67SMatthias Ringwald 3101804d3e67SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 310209e4d397SMatthias Ringwald case HCI_SUBEVENT_LE_READ_LOCAL_P256_PUBLIC_KEY_COMPLETE: 310309e4d397SMatthias Ringwald if (hci_subevent_le_read_local_p256_public_key_complete_get_status(packet)){ 310409e4d397SMatthias Ringwald log_error("Read Local P256 Public Key failed"); 310509e4d397SMatthias Ringwald break; 310609e4d397SMatthias Ringwald } 3107fc5bff5fSMatthias Ringwald hci_subevent_le_read_local_p256_public_key_complete_get_dhkey_x(packet, &ec_q[0]); 3108fc5bff5fSMatthias Ringwald hci_subevent_le_read_local_p256_public_key_complete_get_dhkey_y(packet, &ec_q[32]); 310909e4d397SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_DONE; 311009e4d397SMatthias Ringwald sm_log_ec_keypair(); 311109e4d397SMatthias Ringwald break; 3112804d3e67SMatthias Ringwald #endif 31133deb3ec6SMatthias Ringwald default: 31143deb3ec6SMatthias Ringwald break; 31153deb3ec6SMatthias Ringwald } 31163deb3ec6SMatthias Ringwald break; 31173deb3ec6SMatthias Ringwald 31183deb3ec6SMatthias Ringwald case HCI_EVENT_ENCRYPTION_CHANGE: 3119711e6c80SMatthias Ringwald con_handle = little_endian_read_16(packet, 3); 3120711e6c80SMatthias Ringwald sm_conn = sm_get_connection_for_handle(con_handle); 31213deb3ec6SMatthias Ringwald if (!sm_conn) break; 31223deb3ec6SMatthias Ringwald 31233deb3ec6SMatthias Ringwald sm_conn->sm_connection_encrypted = packet[5]; 31243deb3ec6SMatthias Ringwald log_info("Encryption state change: %u, key size %u", sm_conn->sm_connection_encrypted, 31253deb3ec6SMatthias Ringwald sm_conn->sm_actual_encryption_key_size); 31263deb3ec6SMatthias Ringwald log_info("event handler, state %u", sm_conn->sm_engine_state); 31273deb3ec6SMatthias Ringwald if (!sm_conn->sm_connection_encrypted) break; 31283deb3ec6SMatthias Ringwald // continue if part of initial pairing 31293deb3ec6SMatthias Ringwald switch (sm_conn->sm_engine_state){ 31303deb3ec6SMatthias Ringwald case SM_INITIATOR_PH0_W4_CONNECTION_ENCRYPTED: 31313deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_CONNECTED; 31323deb3ec6SMatthias Ringwald sm_done_for_handle(sm_conn->sm_handle); 31333deb3ec6SMatthias Ringwald break; 31343deb3ec6SMatthias Ringwald case SM_PH2_W4_CONNECTION_ENCRYPTED: 313542134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 31363deb3ec6SMatthias Ringwald // slave 3137bbf8db22SMatthias Ringwald if (setup->sm_use_secure_connections){ 3138bbf8db22SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_DISTRIBUTE_KEYS; 3139bbf8db22SMatthias Ringwald } else { 31403deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_GET_RANDOM; 3141bbf8db22SMatthias Ringwald } 31423deb3ec6SMatthias Ringwald } else { 31433deb3ec6SMatthias Ringwald // master 31443deb3ec6SMatthias Ringwald if (sm_key_distribution_all_received(sm_conn)){ 31453deb3ec6SMatthias Ringwald // skip receiving keys as there are none 31463deb3ec6SMatthias Ringwald sm_key_distribution_handle_all_received(sm_conn); 31473deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_GET_RANDOM; 31483deb3ec6SMatthias Ringwald } else { 31493deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_RECEIVE_KEYS; 31503deb3ec6SMatthias Ringwald } 31513deb3ec6SMatthias Ringwald } 31523deb3ec6SMatthias Ringwald break; 31533deb3ec6SMatthias Ringwald default: 31543deb3ec6SMatthias Ringwald break; 31553deb3ec6SMatthias Ringwald } 31563deb3ec6SMatthias Ringwald break; 31573deb3ec6SMatthias Ringwald 31583deb3ec6SMatthias Ringwald case HCI_EVENT_ENCRYPTION_KEY_REFRESH_COMPLETE: 3159711e6c80SMatthias Ringwald con_handle = little_endian_read_16(packet, 3); 3160711e6c80SMatthias Ringwald sm_conn = sm_get_connection_for_handle(con_handle); 31613deb3ec6SMatthias Ringwald if (!sm_conn) break; 31623deb3ec6SMatthias Ringwald 31633deb3ec6SMatthias Ringwald log_info("Encryption key refresh complete, key size %u", sm_conn->sm_actual_encryption_key_size); 31643deb3ec6SMatthias Ringwald log_info("event handler, state %u", sm_conn->sm_engine_state); 31653deb3ec6SMatthias Ringwald // continue if part of initial pairing 31663deb3ec6SMatthias Ringwald switch (sm_conn->sm_engine_state){ 31673deb3ec6SMatthias Ringwald case SM_INITIATOR_PH0_W4_CONNECTION_ENCRYPTED: 31683deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_CONNECTED; 31693deb3ec6SMatthias Ringwald sm_done_for_handle(sm_conn->sm_handle); 31703deb3ec6SMatthias Ringwald break; 31713deb3ec6SMatthias Ringwald case SM_PH2_W4_CONNECTION_ENCRYPTED: 317242134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 31733deb3ec6SMatthias Ringwald // slave 31743deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_GET_RANDOM; 31753deb3ec6SMatthias Ringwald } else { 31763deb3ec6SMatthias Ringwald // master 31773deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_RECEIVE_KEYS; 31783deb3ec6SMatthias Ringwald } 31793deb3ec6SMatthias Ringwald break; 31803deb3ec6SMatthias Ringwald default: 31813deb3ec6SMatthias Ringwald break; 31823deb3ec6SMatthias Ringwald } 31833deb3ec6SMatthias Ringwald break; 31843deb3ec6SMatthias Ringwald 31853deb3ec6SMatthias Ringwald 31863deb3ec6SMatthias Ringwald case HCI_EVENT_DISCONNECTION_COMPLETE: 3187711e6c80SMatthias Ringwald con_handle = little_endian_read_16(packet, 3); 3188711e6c80SMatthias Ringwald sm_done_for_handle(con_handle); 3189711e6c80SMatthias Ringwald sm_conn = sm_get_connection_for_handle(con_handle); 31903deb3ec6SMatthias Ringwald if (!sm_conn) break; 31913deb3ec6SMatthias Ringwald 31923deb3ec6SMatthias Ringwald // delete stored bonding on disconnect with authentication failure in ph0 31933deb3ec6SMatthias Ringwald if (sm_conn->sm_role == 0 31943deb3ec6SMatthias Ringwald && sm_conn->sm_engine_state == SM_INITIATOR_PH0_W4_CONNECTION_ENCRYPTED 31953deb3ec6SMatthias Ringwald && packet[2] == ERROR_CODE_AUTHENTICATION_FAILURE){ 31963deb3ec6SMatthias Ringwald le_device_db_remove(sm_conn->sm_le_db_index); 31973deb3ec6SMatthias Ringwald } 31983deb3ec6SMatthias Ringwald 31993deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_GENERAL_IDLE; 32003deb3ec6SMatthias Ringwald sm_conn->sm_handle = 0; 32013deb3ec6SMatthias Ringwald break; 32023deb3ec6SMatthias Ringwald 32033deb3ec6SMatthias Ringwald case HCI_EVENT_COMMAND_COMPLETE: 3204073bd0faSMatthias Ringwald if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_le_encrypt)){ 32053deb3ec6SMatthias Ringwald sm_handle_encryption_result(&packet[6]); 32063deb3ec6SMatthias Ringwald break; 32073deb3ec6SMatthias Ringwald } 3208073bd0faSMatthias Ringwald if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_le_rand)){ 32093deb3ec6SMatthias Ringwald sm_handle_random_result(&packet[6]); 32103deb3ec6SMatthias Ringwald break; 32113deb3ec6SMatthias Ringwald } 321233373e40SMatthias Ringwald if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_read_bd_addr)){ 321333373e40SMatthias Ringwald // Hack for Nordic nRF5 series that doesn't have public address: 321433373e40SMatthias Ringwald // - with patches from port/nrf5-zephyr, hci_read_bd_addr returns random static address 321533373e40SMatthias Ringwald // - we use this as default for advertisements/connections 321661f37892SMatthias Ringwald if (hci_get_manufacturer() == BLUETOOTH_COMPANY_ID_NORDIC_SEMICONDUCTOR_ASA){ 321733373e40SMatthias Ringwald log_info("nRF5: using (fake) public address as random static address"); 321833373e40SMatthias Ringwald bd_addr_t addr; 321933373e40SMatthias Ringwald reverse_bd_addr(&packet[OFFSET_OF_DATA_IN_COMMAND_COMPLETE + 1], addr); 322033373e40SMatthias Ringwald gap_random_address_set(addr); 322133373e40SMatthias Ringwald } 322233373e40SMatthias Ringwald } 322365b44ffdSMatthias Ringwald break; 322465b44ffdSMatthias Ringwald default: 322565b44ffdSMatthias Ringwald break; 32263deb3ec6SMatthias Ringwald } 322765b44ffdSMatthias Ringwald break; 322865b44ffdSMatthias Ringwald default: 322965b44ffdSMatthias Ringwald break; 32303deb3ec6SMatthias Ringwald } 32313deb3ec6SMatthias Ringwald 32323deb3ec6SMatthias Ringwald sm_run(); 32333deb3ec6SMatthias Ringwald } 32343deb3ec6SMatthias Ringwald 32353deb3ec6SMatthias Ringwald static inline int sm_calc_actual_encryption_key_size(int other){ 32363deb3ec6SMatthias Ringwald if (other < sm_min_encryption_key_size) return 0; 32373deb3ec6SMatthias Ringwald if (other < sm_max_encryption_key_size) return other; 32383deb3ec6SMatthias Ringwald return sm_max_encryption_key_size; 32393deb3ec6SMatthias Ringwald } 32403deb3ec6SMatthias Ringwald 3241945888f5SMatthias Ringwald 324231c09488SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3243945888f5SMatthias Ringwald static int sm_just_works_or_numeric_comparison(stk_generation_method_t method){ 3244945888f5SMatthias Ringwald switch (method){ 3245945888f5SMatthias Ringwald case JUST_WORKS: 3246945888f5SMatthias Ringwald case NK_BOTH_INPUT: 3247945888f5SMatthias Ringwald return 1; 3248945888f5SMatthias Ringwald default: 3249945888f5SMatthias Ringwald return 0; 3250945888f5SMatthias Ringwald } 3251945888f5SMatthias Ringwald } 325207036a04SMatthias Ringwald // responder 3253945888f5SMatthias Ringwald 3254688a08f9SMatthias Ringwald static int sm_passkey_used(stk_generation_method_t method){ 3255688a08f9SMatthias Ringwald switch (method){ 3256688a08f9SMatthias Ringwald case PK_RESP_INPUT: 3257688a08f9SMatthias Ringwald return 1; 3258688a08f9SMatthias Ringwald default: 3259688a08f9SMatthias Ringwald return 0; 3260688a08f9SMatthias Ringwald } 3261688a08f9SMatthias Ringwald } 326231c09488SMatthias Ringwald #endif 3263688a08f9SMatthias Ringwald 32643deb3ec6SMatthias Ringwald /** 32653deb3ec6SMatthias Ringwald * @return ok 32663deb3ec6SMatthias Ringwald */ 32673deb3ec6SMatthias Ringwald static int sm_validate_stk_generation_method(void){ 32683deb3ec6SMatthias Ringwald // check if STK generation method is acceptable by client 32693deb3ec6SMatthias Ringwald switch (setup->sm_stk_generation_method){ 32703deb3ec6SMatthias Ringwald case JUST_WORKS: 32713deb3ec6SMatthias Ringwald return (sm_accepted_stk_generation_methods & SM_STK_GENERATION_METHOD_JUST_WORKS) != 0; 32723deb3ec6SMatthias Ringwald case PK_RESP_INPUT: 32733deb3ec6SMatthias Ringwald case PK_INIT_INPUT: 32743deb3ec6SMatthias Ringwald case OK_BOTH_INPUT: 32753deb3ec6SMatthias Ringwald return (sm_accepted_stk_generation_methods & SM_STK_GENERATION_METHOD_PASSKEY) != 0; 32763deb3ec6SMatthias Ringwald case OOB: 32773deb3ec6SMatthias Ringwald return (sm_accepted_stk_generation_methods & SM_STK_GENERATION_METHOD_OOB) != 0; 3278446a8c36SMatthias Ringwald case NK_BOTH_INPUT: 3279b4343428SMatthias Ringwald return (sm_accepted_stk_generation_methods & SM_STK_GENERATION_METHOD_NUMERIC_COMPARISON) != 0; 3280446a8c36SMatthias Ringwald return 1; 32813deb3ec6SMatthias Ringwald default: 32823deb3ec6SMatthias Ringwald return 0; 32833deb3ec6SMatthias Ringwald } 32843deb3ec6SMatthias Ringwald } 32853deb3ec6SMatthias Ringwald 3286711e6c80SMatthias Ringwald static void sm_pdu_handler(uint8_t packet_type, hci_con_handle_t con_handle, uint8_t *packet, uint16_t size){ 32873deb3ec6SMatthias Ringwald 32889ec2630cSMatthias Ringwald UNUSED(size); 32899ec2630cSMatthias Ringwald 3290b170b20fSMatthias Ringwald if (packet_type == HCI_EVENT_PACKET && packet[0] == L2CAP_EVENT_CAN_SEND_NOW){ 3291b170b20fSMatthias Ringwald sm_run(); 3292b170b20fSMatthias Ringwald } 3293b170b20fSMatthias Ringwald 32943deb3ec6SMatthias Ringwald if (packet_type != SM_DATA_PACKET) return; 32953deb3ec6SMatthias Ringwald 3296711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 32973deb3ec6SMatthias Ringwald if (!sm_conn) return; 32983deb3ec6SMatthias Ringwald 32993deb3ec6SMatthias Ringwald if (packet[0] == SM_CODE_PAIRING_FAILED){ 33003deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = sm_conn->sm_role ? SM_RESPONDER_IDLE : SM_INITIATOR_CONNECTED; 33013deb3ec6SMatthias Ringwald return; 33023deb3ec6SMatthias Ringwald } 33033deb3ec6SMatthias Ringwald 3304e03e489aSMatthias Ringwald log_debug("sm_pdu_handler: state %u, pdu 0x%02x", sm_conn->sm_engine_state, packet[0]); 33053deb3ec6SMatthias Ringwald 33063deb3ec6SMatthias Ringwald int err; 330742134bc6SMatthias Ringwald UNUSED(err); 33083deb3ec6SMatthias Ringwald 33093d7fe1e9SMatthias Ringwald if (packet[0] == SM_CODE_KEYPRESS_NOTIFICATION){ 33103d7fe1e9SMatthias Ringwald uint8_t buffer[5]; 33113d7fe1e9SMatthias Ringwald buffer[0] = SM_EVENT_KEYPRESS_NOTIFICATION; 33123d7fe1e9SMatthias Ringwald buffer[1] = 3; 33133d7fe1e9SMatthias Ringwald little_endian_store_16(buffer, 2, con_handle); 33143d7fe1e9SMatthias Ringwald buffer[4] = packet[1]; 33153d7fe1e9SMatthias Ringwald sm_dispatch_event(HCI_EVENT_PACKET, 0, buffer, sizeof(buffer)); 33163d7fe1e9SMatthias Ringwald return; 33173d7fe1e9SMatthias Ringwald } 33183d7fe1e9SMatthias Ringwald 33193deb3ec6SMatthias Ringwald switch (sm_conn->sm_engine_state){ 33203deb3ec6SMatthias Ringwald 33213deb3ec6SMatthias Ringwald // a sm timeout requries a new physical connection 33223deb3ec6SMatthias Ringwald case SM_GENERAL_TIMEOUT: 33233deb3ec6SMatthias Ringwald return; 33243deb3ec6SMatthias Ringwald 332542134bc6SMatthias Ringwald #ifdef ENABLE_LE_CENTRAL 332642134bc6SMatthias Ringwald 33273deb3ec6SMatthias Ringwald // Initiator 33283deb3ec6SMatthias Ringwald case SM_INITIATOR_CONNECTED: 33293deb3ec6SMatthias Ringwald if ((packet[0] != SM_CODE_SECURITY_REQUEST) || (sm_conn->sm_role)){ 33303deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 33313deb3ec6SMatthias Ringwald break; 33323deb3ec6SMatthias Ringwald } 33333deb3ec6SMatthias Ringwald if (sm_conn->sm_irk_lookup_state == IRK_LOOKUP_FAILED){ 33343deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST; 33353deb3ec6SMatthias Ringwald break; 33363deb3ec6SMatthias Ringwald } 33373deb3ec6SMatthias Ringwald if (sm_conn->sm_irk_lookup_state == IRK_LOOKUP_SUCCEEDED){ 33383764b551SMatthias Ringwald sm_key_t ltk; 333959066796SMatthias Ringwald le_device_db_encryption_get(sm_conn->sm_le_db_index, NULL, NULL, ltk, NULL, NULL, NULL); 334059066796SMatthias Ringwald if (!sm_is_null_key(ltk)){ 33413deb3ec6SMatthias Ringwald log_info("sm: Setting up previous ltk/ediv/rand for device index %u", sm_conn->sm_le_db_index); 33423deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH0_HAS_LTK; 33433deb3ec6SMatthias Ringwald } else { 33443deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST; 33453deb3ec6SMatthias Ringwald } 33463deb3ec6SMatthias Ringwald break; 33473deb3ec6SMatthias Ringwald } 33483deb3ec6SMatthias Ringwald // otherwise, store security request 33493deb3ec6SMatthias Ringwald sm_conn->sm_security_request_received = 1; 33503deb3ec6SMatthias Ringwald break; 33513deb3ec6SMatthias Ringwald 33523deb3ec6SMatthias Ringwald case SM_INITIATOR_PH1_W4_PAIRING_RESPONSE: 33533deb3ec6SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_RESPONSE){ 33543deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 33553deb3ec6SMatthias Ringwald break; 33563deb3ec6SMatthias Ringwald } 33573deb3ec6SMatthias Ringwald // store pairing request 33583deb3ec6SMatthias Ringwald memcpy(&setup->sm_s_pres, packet, sizeof(sm_pairing_packet_t)); 33593deb3ec6SMatthias Ringwald err = sm_stk_generation_init(sm_conn); 33603deb3ec6SMatthias Ringwald if (err){ 33613deb3ec6SMatthias Ringwald setup->sm_pairing_failed_reason = err; 33623deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_GENERAL_SEND_PAIRING_FAILED; 33633deb3ec6SMatthias Ringwald break; 33643deb3ec6SMatthias Ringwald } 3365b41539d5SMatthias Ringwald 3366b41539d5SMatthias Ringwald // generate random number first, if we need to show passkey 3367b41539d5SMatthias Ringwald if (setup->sm_stk_generation_method == PK_RESP_INPUT){ 3368b41539d5SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_GET_RANDOM_TK; 3369b41539d5SMatthias Ringwald break; 3370b41539d5SMatthias Ringwald } 3371b41539d5SMatthias Ringwald 3372136d331aSMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3373136d331aSMatthias Ringwald if (setup->sm_use_secure_connections){ 33748cba5ca3SMatthias Ringwald // SC Numeric Comparison will trigger user response after public keys & nonces have been exchanged 33758cba5ca3SMatthias Ringwald if (setup->sm_stk_generation_method == JUST_WORKS){ 3376136d331aSMatthias Ringwald sm_conn->sm_engine_state = SM_PH1_W4_USER_RESPONSE; 3377136d331aSMatthias Ringwald sm_trigger_user_response(sm_conn); 3378136d331aSMatthias Ringwald if (setup->sm_user_response == SM_USER_RESPONSE_IDLE){ 3379c6b7cbd9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_PUBLIC_KEY_COMMAND; 3380136d331aSMatthias Ringwald } 33818cba5ca3SMatthias Ringwald } else { 3382c6b7cbd9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_PUBLIC_KEY_COMMAND; 33838cba5ca3SMatthias Ringwald } 3384136d331aSMatthias Ringwald break; 3385136d331aSMatthias Ringwald } 3386136d331aSMatthias Ringwald #endif 33873deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH1_W4_USER_RESPONSE; 33883deb3ec6SMatthias Ringwald sm_trigger_user_response(sm_conn); 33893deb3ec6SMatthias Ringwald // response_idle == nothing <--> sm_trigger_user_response() did not require response 33903deb3ec6SMatthias Ringwald if (setup->sm_user_response == SM_USER_RESPONSE_IDLE){ 33913deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_C1_GET_RANDOM_A; 33923deb3ec6SMatthias Ringwald } 33933deb3ec6SMatthias Ringwald break; 33943deb3ec6SMatthias Ringwald 33953deb3ec6SMatthias Ringwald case SM_INITIATOR_PH2_W4_PAIRING_CONFIRM: 33963deb3ec6SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_CONFIRM){ 33973deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 33983deb3ec6SMatthias Ringwald break; 33993deb3ec6SMatthias Ringwald } 34003deb3ec6SMatthias Ringwald 34013deb3ec6SMatthias Ringwald // store s_confirm 34029c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_confirm); 34033deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_SEND_PAIRING_RANDOM; 34043deb3ec6SMatthias Ringwald break; 34053deb3ec6SMatthias Ringwald 34063deb3ec6SMatthias Ringwald case SM_INITIATOR_PH2_W4_PAIRING_RANDOM: 34073deb3ec6SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_RANDOM){ 34083deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 34093deb3ec6SMatthias Ringwald break;; 34103deb3ec6SMatthias Ringwald } 34113deb3ec6SMatthias Ringwald 34123deb3ec6SMatthias Ringwald // received random value 34139c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_random); 34143deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_C1_GET_ENC_C; 34153deb3ec6SMatthias Ringwald break; 341642134bc6SMatthias Ringwald #endif 34173deb3ec6SMatthias Ringwald 341842134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 34193deb3ec6SMatthias Ringwald // Responder 34203deb3ec6SMatthias Ringwald case SM_RESPONDER_IDLE: 34213deb3ec6SMatthias Ringwald case SM_RESPONDER_SEND_SECURITY_REQUEST: 34223deb3ec6SMatthias Ringwald case SM_RESPONDER_PH1_W4_PAIRING_REQUEST: 34233deb3ec6SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_REQUEST){ 34243deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 34253deb3ec6SMatthias Ringwald break;; 34263deb3ec6SMatthias Ringwald } 34273deb3ec6SMatthias Ringwald 34283deb3ec6SMatthias Ringwald // store pairing request 34293deb3ec6SMatthias Ringwald memcpy(&sm_conn->sm_m_preq, packet, sizeof(sm_pairing_packet_t)); 34303deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_PH1_PAIRING_REQUEST_RECEIVED; 34313deb3ec6SMatthias Ringwald break; 343242134bc6SMatthias Ringwald #endif 34333deb3ec6SMatthias Ringwald 343427c32905SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3435c6b7cbd9SMatthias Ringwald case SM_SC_W4_PUBLIC_KEY_COMMAND: 343627c32905SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_PUBLIC_KEY){ 343727c32905SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 343827c32905SMatthias Ringwald break; 343927c32905SMatthias Ringwald } 3440bccf5e67SMatthias Ringwald 3441e53be891SMatthias Ringwald // store public key for DH Key calculation 3442fc5bff5fSMatthias Ringwald reverse_256(&packet[01], &setup->sm_peer_q[0]); 3443fc5bff5fSMatthias Ringwald reverse_256(&packet[33], &setup->sm_peer_q[32]); 3444bccf5e67SMatthias Ringwald 3445bccf5e67SMatthias Ringwald // validate public key 3446c692d776SMatthias Ringwald err = 0; 3447c692d776SMatthias Ringwald 3448c692d776SMatthias Ringwald #ifdef USE_MICROECC_FOR_ECDH 34494b8ec5bcSMatthias Ringwald #if uECC_SUPPORTS_secp256r1 34504b8ec5bcSMatthias Ringwald // standard version 34514b8ec5bcSMatthias Ringwald err = uECC_valid_public_key(setup->sm_peer_q, uECC_secp256r1()) == 0; 34524b8ec5bcSMatthias Ringwald #else 34534b8ec5bcSMatthias Ringwald // static version 3454c692d776SMatthias Ringwald err = uECC_valid_public_key(setup->sm_peer_q) == 0; 3455c692d776SMatthias Ringwald #endif 34564b8ec5bcSMatthias Ringwald #endif 3457c692d776SMatthias Ringwald 3458bccf5e67SMatthias Ringwald if (err){ 3459bccf5e67SMatthias Ringwald log_error("sm: peer public key invalid %x", err); 3460bccf5e67SMatthias Ringwald // uses "unspecified reason", there is no "public key invalid" error code 3461bccf5e67SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 3462bccf5e67SMatthias Ringwald break; 3463bccf5e67SMatthias Ringwald } 3464891bb64aSMatthias Ringwald 346542134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 3466136d331aSMatthias Ringwald // responder 3467c6b7cbd9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_PUBLIC_KEY_COMMAND; 3468136d331aSMatthias Ringwald } else { 3469136d331aSMatthias Ringwald // initiator 3470a1e31e9cSMatthias Ringwald // stk generation method 3471a1e31e9cSMatthias Ringwald // passkey entry: notify app to show passkey or to request passkey 3472a1e31e9cSMatthias Ringwald switch (setup->sm_stk_generation_method){ 3473a1e31e9cSMatthias Ringwald case JUST_WORKS: 3474a1e31e9cSMatthias Ringwald case NK_BOTH_INPUT: 3475c6b7cbd9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W4_CONFIRMATION; 3476a1e31e9cSMatthias Ringwald break; 3477a1e31e9cSMatthias Ringwald case PK_RESP_INPUT: 347807036a04SMatthias Ringwald sm_sc_start_calculating_local_confirm(sm_conn); 347907036a04SMatthias Ringwald break; 348007036a04SMatthias Ringwald case PK_INIT_INPUT: 3481a1e31e9cSMatthias Ringwald case OK_BOTH_INPUT: 348207036a04SMatthias Ringwald if (setup->sm_user_response != SM_USER_RESPONSE_PASSKEY){ 348307036a04SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W4_USER_RESPONSE; 348407036a04SMatthias Ringwald break; 348507036a04SMatthias Ringwald } 3486b35a3de2SMatthias Ringwald sm_sc_start_calculating_local_confirm(sm_conn); 3487a1e31e9cSMatthias Ringwald break; 3488a1e31e9cSMatthias Ringwald case OOB: 3489a1e31e9cSMatthias Ringwald // TODO: implement SC OOB 3490a1e31e9cSMatthias Ringwald break; 3491a1e31e9cSMatthias Ringwald } 3492136d331aSMatthias Ringwald } 349327c32905SMatthias Ringwald break; 3494e53be891SMatthias Ringwald 3495c6b7cbd9SMatthias Ringwald case SM_SC_W4_CONFIRMATION: 349645a61d50SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_CONFIRM){ 349745a61d50SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 349845a61d50SMatthias Ringwald break; 349945a61d50SMatthias Ringwald } 350045a61d50SMatthias Ringwald // received confirm value 350145a61d50SMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_confirm); 350245a61d50SMatthias Ringwald 350342134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 350445a61d50SMatthias Ringwald // responder 350507036a04SMatthias Ringwald if (sm_passkey_used(setup->sm_stk_generation_method)){ 350607036a04SMatthias Ringwald if (setup->sm_user_response != SM_USER_RESPONSE_PASSKEY){ 350707036a04SMatthias Ringwald // still waiting for passkey 350807036a04SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W4_USER_RESPONSE; 350907036a04SMatthias Ringwald break; 351007036a04SMatthias Ringwald } 351107036a04SMatthias Ringwald } 3512b35a3de2SMatthias Ringwald sm_sc_start_calculating_local_confirm(sm_conn); 351345a61d50SMatthias Ringwald } else { 351445a61d50SMatthias Ringwald // initiator 3515945888f5SMatthias Ringwald if (sm_just_works_or_numeric_comparison(setup->sm_stk_generation_method)){ 3516f1c1783eSMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_GET_RANDOM_A; 3517f1c1783eSMatthias Ringwald } else { 3518c6b7cbd9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_PAIRING_RANDOM; 351945a61d50SMatthias Ringwald } 3520f1c1783eSMatthias Ringwald } 352145a61d50SMatthias Ringwald break; 352245a61d50SMatthias Ringwald 3523c6b7cbd9SMatthias Ringwald case SM_SC_W4_PAIRING_RANDOM: 3524e53be891SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_RANDOM){ 3525e53be891SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 3526136d331aSMatthias Ringwald break; 3527e53be891SMatthias Ringwald } 3528e53be891SMatthias Ringwald 3529e53be891SMatthias Ringwald // received random value 3530e53be891SMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_nonce); 3531e53be891SMatthias Ringwald 35325a293e6eSMatthias Ringwald // validate confirm value if Cb = f4(Pkb, Pka, Nb, z) 35335a293e6eSMatthias Ringwald // only check for JUST WORK/NC in initiator role AND passkey entry 3534a3aba2f9SMatthias Ringwald if (sm_conn->sm_role || sm_passkey_used(setup->sm_stk_generation_method)) { 3535688a08f9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CMAC_FOR_CHECK_CONFIRMATION; 35365a293e6eSMatthias Ringwald } 35376f52a196SMatthias Ringwald 3538688a08f9SMatthias Ringwald sm_sc_state_after_receiving_random(sm_conn); 3539e53be891SMatthias Ringwald break; 3540e53be891SMatthias Ringwald 3541901c000fSMatthias Ringwald case SM_SC_W2_CALCULATE_G2: 3542901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_G2: 3543901c000fSMatthias Ringwald case SM_SC_W2_CALCULATE_F5_SALT: 3544901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_F5_SALT: 3545901c000fSMatthias Ringwald case SM_SC_W2_CALCULATE_F5_MACKEY: 3546901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_F5_MACKEY: 3547901c000fSMatthias Ringwald case SM_SC_W2_CALCULATE_F5_LTK: 3548901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_F5_LTK: 3549901c000fSMatthias Ringwald case SM_SC_W2_CALCULATE_F6_FOR_DHKEY_CHECK: 3550c6b7cbd9SMatthias Ringwald case SM_SC_W4_DHKEY_CHECK_COMMAND: 3551901c000fSMatthias Ringwald case SM_SC_W4_CALCULATE_F6_FOR_DHKEY_CHECK: 3552e53be891SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_DHKEY_CHECK){ 3553e53be891SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 3554e53be891SMatthias Ringwald break; 3555e53be891SMatthias Ringwald } 3556e53be891SMatthias Ringwald // store DHKey Check 3557901c000fSMatthias Ringwald setup->sm_state_vars |= SM_STATE_VAR_DHKEY_COMMAND_RECEIVED; 3558e53be891SMatthias Ringwald reverse_128(&packet[01], setup->sm_peer_dhkey_check); 3559446a8c36SMatthias Ringwald 3560901c000fSMatthias Ringwald // have we been only waiting for dhkey check command? 3561901c000fSMatthias Ringwald if (sm_conn->sm_engine_state == SM_SC_W4_DHKEY_CHECK_COMMAND){ 3562019005a0SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_F6_TO_VERIFY_DHKEY_CHECK; 3563bd57ffebSMatthias Ringwald } 3564bd57ffebSMatthias Ringwald break; 356527c32905SMatthias Ringwald #endif 356627c32905SMatthias Ringwald 356742134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 35683deb3ec6SMatthias Ringwald case SM_RESPONDER_PH1_W4_PAIRING_CONFIRM: 35693deb3ec6SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_CONFIRM){ 35703deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 357127c32905SMatthias Ringwald break; 35723deb3ec6SMatthias Ringwald } 35733deb3ec6SMatthias Ringwald 35743deb3ec6SMatthias Ringwald // received confirm value 35759c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_confirm); 35763deb3ec6SMatthias Ringwald 35773deb3ec6SMatthias Ringwald // notify client to hide shown passkey 35783deb3ec6SMatthias Ringwald if (setup->sm_stk_generation_method == PK_INIT_INPUT){ 35795611a760SMatthias Ringwald sm_notify_client_base(SM_EVENT_PASSKEY_DISPLAY_CANCEL, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address); 35803deb3ec6SMatthias Ringwald } 35813deb3ec6SMatthias Ringwald 35823deb3ec6SMatthias Ringwald // handle user cancel pairing? 35833deb3ec6SMatthias Ringwald if (setup->sm_user_response == SM_USER_RESPONSE_DECLINE){ 35843deb3ec6SMatthias Ringwald setup->sm_pairing_failed_reason = SM_REASON_PASSKEYT_ENTRY_FAILED; 35853deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_GENERAL_SEND_PAIRING_FAILED; 35863deb3ec6SMatthias Ringwald break; 35873deb3ec6SMatthias Ringwald } 35883deb3ec6SMatthias Ringwald 35893deb3ec6SMatthias Ringwald // wait for user action? 35903deb3ec6SMatthias Ringwald if (setup->sm_user_response == SM_USER_RESPONSE_PENDING){ 35913deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH1_W4_USER_RESPONSE; 35923deb3ec6SMatthias Ringwald break; 35933deb3ec6SMatthias Ringwald } 35943deb3ec6SMatthias Ringwald 35953deb3ec6SMatthias Ringwald // calculate and send local_confirm 35963deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_C1_GET_RANDOM_A; 35973deb3ec6SMatthias Ringwald break; 35983deb3ec6SMatthias Ringwald 35993deb3ec6SMatthias Ringwald case SM_RESPONDER_PH2_W4_PAIRING_RANDOM: 36003deb3ec6SMatthias Ringwald if (packet[0] != SM_CODE_PAIRING_RANDOM){ 36013deb3ec6SMatthias Ringwald sm_pdu_received_in_wrong_state(sm_conn); 36023deb3ec6SMatthias Ringwald break;; 36033deb3ec6SMatthias Ringwald } 36043deb3ec6SMatthias Ringwald 36053deb3ec6SMatthias Ringwald // received random value 36069c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_random); 36073deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_C1_GET_ENC_C; 36083deb3ec6SMatthias Ringwald break; 360942134bc6SMatthias Ringwald #endif 36103deb3ec6SMatthias Ringwald 36113deb3ec6SMatthias Ringwald case SM_PH3_RECEIVE_KEYS: 36123deb3ec6SMatthias Ringwald switch(packet[0]){ 36133deb3ec6SMatthias Ringwald case SM_CODE_ENCRYPTION_INFORMATION: 36143deb3ec6SMatthias Ringwald setup->sm_key_distribution_received_set |= SM_KEYDIST_FLAG_ENCRYPTION_INFORMATION; 36159c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_ltk); 36163deb3ec6SMatthias Ringwald break; 36173deb3ec6SMatthias Ringwald 36183deb3ec6SMatthias Ringwald case SM_CODE_MASTER_IDENTIFICATION: 36193deb3ec6SMatthias Ringwald setup->sm_key_distribution_received_set |= SM_KEYDIST_FLAG_MASTER_IDENTIFICATION; 3620f8fbdce0SMatthias Ringwald setup->sm_peer_ediv = little_endian_read_16(packet, 1); 36219c80e4ccSMatthias Ringwald reverse_64(&packet[3], setup->sm_peer_rand); 36223deb3ec6SMatthias Ringwald break; 36233deb3ec6SMatthias Ringwald 36243deb3ec6SMatthias Ringwald case SM_CODE_IDENTITY_INFORMATION: 36253deb3ec6SMatthias Ringwald setup->sm_key_distribution_received_set |= SM_KEYDIST_FLAG_IDENTITY_INFORMATION; 36269c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_irk); 36273deb3ec6SMatthias Ringwald break; 36283deb3ec6SMatthias Ringwald 36293deb3ec6SMatthias Ringwald case SM_CODE_IDENTITY_ADDRESS_INFORMATION: 36303deb3ec6SMatthias Ringwald setup->sm_key_distribution_received_set |= SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION; 36313deb3ec6SMatthias Ringwald setup->sm_peer_addr_type = packet[1]; 3632724d70a2SMatthias Ringwald reverse_bd_addr(&packet[2], setup->sm_peer_address); 36333deb3ec6SMatthias Ringwald break; 36343deb3ec6SMatthias Ringwald 36353deb3ec6SMatthias Ringwald case SM_CODE_SIGNING_INFORMATION: 36363deb3ec6SMatthias Ringwald setup->sm_key_distribution_received_set |= SM_KEYDIST_FLAG_SIGNING_IDENTIFICATION; 36379c80e4ccSMatthias Ringwald reverse_128(&packet[1], setup->sm_peer_csrk); 36383deb3ec6SMatthias Ringwald break; 36393deb3ec6SMatthias Ringwald default: 36403deb3ec6SMatthias Ringwald // Unexpected PDU 36413deb3ec6SMatthias Ringwald log_info("Unexpected PDU %u in SM_PH3_RECEIVE_KEYS", packet[0]); 36423deb3ec6SMatthias Ringwald break; 36433deb3ec6SMatthias Ringwald } 36443deb3ec6SMatthias Ringwald // done with key distribution? 36453deb3ec6SMatthias Ringwald if (sm_key_distribution_all_received(sm_conn)){ 36463deb3ec6SMatthias Ringwald 36473deb3ec6SMatthias Ringwald sm_key_distribution_handle_all_received(sm_conn); 36483deb3ec6SMatthias Ringwald 364942134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 36502bacf595SMatthias Ringwald if (setup->sm_use_secure_connections && (setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION)){ 36512bacf595SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_W2_CALCULATE_H6_ILK; 36522bacf595SMatthias Ringwald } else { 36533deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_IDLE; 36543deb3ec6SMatthias Ringwald sm_done_for_handle(sm_conn->sm_handle); 36552bacf595SMatthias Ringwald } 36563deb3ec6SMatthias Ringwald } else { 3657625f00b2SMatthias Ringwald if (setup->sm_use_secure_connections){ 3658625f00b2SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_DISTRIBUTE_KEYS; 3659bbf8db22SMatthias Ringwald } else { 3660bbf8db22SMatthias Ringwald sm_conn->sm_engine_state = SM_PH3_GET_RANDOM; 3661625f00b2SMatthias Ringwald } 36623deb3ec6SMatthias Ringwald } 36633deb3ec6SMatthias Ringwald } 36643deb3ec6SMatthias Ringwald break; 36653deb3ec6SMatthias Ringwald default: 36663deb3ec6SMatthias Ringwald // Unexpected PDU 36673deb3ec6SMatthias Ringwald log_info("Unexpected PDU %u in state %u", packet[0], sm_conn->sm_engine_state); 36683deb3ec6SMatthias Ringwald break; 36693deb3ec6SMatthias Ringwald } 36703deb3ec6SMatthias Ringwald 36713deb3ec6SMatthias Ringwald // try to send preparared packet 36723deb3ec6SMatthias Ringwald sm_run(); 36733deb3ec6SMatthias Ringwald } 36743deb3ec6SMatthias Ringwald 36753deb3ec6SMatthias Ringwald // Security Manager Client API 36763deb3ec6SMatthias Ringwald void sm_register_oob_data_callback( int (*get_oob_data_callback)(uint8_t addres_type, bd_addr_t addr, uint8_t * oob_data)){ 36773deb3ec6SMatthias Ringwald sm_get_oob_data = get_oob_data_callback; 36783deb3ec6SMatthias Ringwald } 36793deb3ec6SMatthias Ringwald 368089a78d34SMatthias Ringwald void sm_add_event_handler(btstack_packet_callback_registration_t * callback_handler){ 368189a78d34SMatthias Ringwald btstack_linked_list_add_tail(&sm_event_handlers, (btstack_linked_item_t*) callback_handler); 368289a78d34SMatthias Ringwald } 368389a78d34SMatthias Ringwald 36843deb3ec6SMatthias Ringwald void sm_set_accepted_stk_generation_methods(uint8_t accepted_stk_generation_methods){ 36853deb3ec6SMatthias Ringwald sm_accepted_stk_generation_methods = accepted_stk_generation_methods; 36863deb3ec6SMatthias Ringwald } 36873deb3ec6SMatthias Ringwald 36883deb3ec6SMatthias Ringwald void sm_set_encryption_key_size_range(uint8_t min_size, uint8_t max_size){ 36893deb3ec6SMatthias Ringwald sm_min_encryption_key_size = min_size; 36903deb3ec6SMatthias Ringwald sm_max_encryption_key_size = max_size; 36913deb3ec6SMatthias Ringwald } 36923deb3ec6SMatthias Ringwald 36933deb3ec6SMatthias Ringwald void sm_set_authentication_requirements(uint8_t auth_req){ 36943deb3ec6SMatthias Ringwald sm_auth_req = auth_req; 36953deb3ec6SMatthias Ringwald } 36963deb3ec6SMatthias Ringwald 36973deb3ec6SMatthias Ringwald void sm_set_io_capabilities(io_capability_t io_capability){ 36983deb3ec6SMatthias Ringwald sm_io_capabilities = io_capability; 36993deb3ec6SMatthias Ringwald } 37003deb3ec6SMatthias Ringwald 370142134bc6SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 37023deb3ec6SMatthias Ringwald void sm_set_request_security(int enable){ 37033deb3ec6SMatthias Ringwald sm_slave_request_security = enable; 37043deb3ec6SMatthias Ringwald } 370542134bc6SMatthias Ringwald #endif 37063deb3ec6SMatthias Ringwald 37073deb3ec6SMatthias Ringwald void sm_set_er(sm_key_t er){ 37083deb3ec6SMatthias Ringwald memcpy(sm_persistent_er, er, 16); 37093deb3ec6SMatthias Ringwald } 37103deb3ec6SMatthias Ringwald 37113deb3ec6SMatthias Ringwald void sm_set_ir(sm_key_t ir){ 37123deb3ec6SMatthias Ringwald memcpy(sm_persistent_ir, ir, 16); 37133deb3ec6SMatthias Ringwald } 37143deb3ec6SMatthias Ringwald 37153deb3ec6SMatthias Ringwald // Testing support only 37163deb3ec6SMatthias Ringwald void sm_test_set_irk(sm_key_t irk){ 37173deb3ec6SMatthias Ringwald memcpy(sm_persistent_irk, irk, 16); 37183deb3ec6SMatthias Ringwald sm_persistent_irk_ready = 1; 37193deb3ec6SMatthias Ringwald } 37203deb3ec6SMatthias Ringwald 37213deb3ec6SMatthias Ringwald void sm_test_use_fixed_local_csrk(void){ 37223deb3ec6SMatthias Ringwald test_use_fixed_local_csrk = 1; 37233deb3ec6SMatthias Ringwald } 37243deb3ec6SMatthias Ringwald 37253deb3ec6SMatthias Ringwald void sm_init(void){ 37263deb3ec6SMatthias Ringwald // set some (BTstack default) ER and IR 37273deb3ec6SMatthias Ringwald int i; 37283deb3ec6SMatthias Ringwald sm_key_t er; 37293deb3ec6SMatthias Ringwald sm_key_t ir; 37303deb3ec6SMatthias Ringwald for (i=0;i<16;i++){ 37313deb3ec6SMatthias Ringwald er[i] = 0x30 + i; 37323deb3ec6SMatthias Ringwald ir[i] = 0x90 + i; 37333deb3ec6SMatthias Ringwald } 37343deb3ec6SMatthias Ringwald sm_set_er(er); 37353deb3ec6SMatthias Ringwald sm_set_ir(ir); 37363deb3ec6SMatthias Ringwald // defaults 37373deb3ec6SMatthias Ringwald sm_accepted_stk_generation_methods = SM_STK_GENERATION_METHOD_JUST_WORKS 37383deb3ec6SMatthias Ringwald | SM_STK_GENERATION_METHOD_OOB 3739b4343428SMatthias Ringwald | SM_STK_GENERATION_METHOD_PASSKEY 3740b4343428SMatthias Ringwald | SM_STK_GENERATION_METHOD_NUMERIC_COMPARISON; 3741b4343428SMatthias Ringwald 37423deb3ec6SMatthias Ringwald sm_max_encryption_key_size = 16; 37433deb3ec6SMatthias Ringwald sm_min_encryption_key_size = 7; 37443deb3ec6SMatthias Ringwald 37457a766ebfSMatthias Ringwald #ifdef ENABLE_CMAC_ENGINE 37463deb3ec6SMatthias Ringwald sm_cmac_state = CMAC_IDLE; 37477a766ebfSMatthias Ringwald #endif 37483deb3ec6SMatthias Ringwald dkg_state = DKG_W4_WORKING; 37493deb3ec6SMatthias Ringwald rau_state = RAU_W4_WORKING; 37503deb3ec6SMatthias Ringwald sm_aes128_state = SM_AES128_IDLE; 37513deb3ec6SMatthias Ringwald sm_address_resolution_test = -1; // no private address to resolve yet 37523deb3ec6SMatthias Ringwald sm_address_resolution_ah_calculation_active = 0; 37533deb3ec6SMatthias Ringwald sm_address_resolution_mode = ADDRESS_RESOLUTION_IDLE; 37543deb3ec6SMatthias Ringwald sm_address_resolution_general_queue = NULL; 37553deb3ec6SMatthias Ringwald 37563deb3ec6SMatthias Ringwald gap_random_adress_update_period = 15 * 60 * 1000L; 37577149bde5SMatthias Ringwald sm_active_connection_handle = HCI_CON_HANDLE_INVALID; 37583deb3ec6SMatthias Ringwald 37593deb3ec6SMatthias Ringwald test_use_fixed_local_csrk = 0; 37603deb3ec6SMatthias Ringwald 3761e03e489aSMatthias Ringwald // register for HCI Events from HCI 3762e03e489aSMatthias Ringwald hci_event_callback_registration.callback = &sm_event_packet_handler; 3763e03e489aSMatthias Ringwald hci_add_event_handler(&hci_event_callback_registration); 3764e03e489aSMatthias Ringwald 3765b170b20fSMatthias Ringwald // and L2CAP PDUs + L2CAP_EVENT_CAN_SEND_NOW 3766e03e489aSMatthias Ringwald l2cap_register_fixed_channel(sm_pdu_handler, L2CAP_CID_SECURITY_MANAGER_PROTOCOL); 376727c32905SMatthias Ringwald 376809e4d397SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 37697df18c15SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_IDLE; 377009e4d397SMatthias Ringwald #endif 37717df18c15SMatthias Ringwald } 37727df18c15SMatthias Ringwald 3773df86eb96SMatthias Ringwald void sm_use_fixed_ec_keypair(uint8_t * qx, uint8_t * qy, uint8_t * d){ 3774a3aba2f9SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3775fc5bff5fSMatthias Ringwald memcpy(&ec_q[0], qx, 32); 3776fc5bff5fSMatthias Ringwald memcpy(&ec_q[32], qy, 32); 3777df86eb96SMatthias Ringwald memcpy(ec_d, d, 32); 3778df86eb96SMatthias Ringwald sm_have_ec_keypair = 1; 3779df86eb96SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_DONE; 3780d0662982SMatthias Ringwald #else 3781d0662982SMatthias Ringwald UNUSED(qx); 3782d0662982SMatthias Ringwald UNUSED(qy); 3783d0662982SMatthias Ringwald UNUSED(d); 3784a3aba2f9SMatthias Ringwald #endif 3785df86eb96SMatthias Ringwald } 3786df86eb96SMatthias Ringwald 3787c692d776SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3788c692d776SMatthias Ringwald static void parse_hex(uint8_t * buffer, const char * hex_string){ 3789c692d776SMatthias Ringwald while (*hex_string){ 3790c692d776SMatthias Ringwald int high_nibble = nibble_for_char(*hex_string++); 3791c692d776SMatthias Ringwald int low_nibble = nibble_for_char(*hex_string++); 3792c692d776SMatthias Ringwald *buffer++ = (high_nibble << 4) | low_nibble; 3793c692d776SMatthias Ringwald } 3794c692d776SMatthias Ringwald } 3795c692d776SMatthias Ringwald #endif 3796c692d776SMatthias Ringwald 37977df18c15SMatthias Ringwald void sm_test_use_fixed_ec_keypair(void){ 3798a3aba2f9SMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3799c692d776SMatthias Ringwald const char * ec_d_string = "3f49f6d4a3c55f3874c9b3e3d2103f504aff607beb40b7995899b8a6cd3c1abd"; 3800c692d776SMatthias Ringwald const char * ec_qx_string = "20b003d2f297be2c5e2c83a7e9f9a5b9eff49111acf4fddbcc0301480e359de6"; 3801c692d776SMatthias Ringwald const char * ec_qy_string = "dc809c49652aeb6d63329abf5a52155c766345c28fed3024741c8ed01589d28b"; 3802c692d776SMatthias Ringwald parse_hex(ec_d, ec_d_string); 3803c692d776SMatthias Ringwald parse_hex(&ec_q[0], ec_qx_string); 3804c692d776SMatthias Ringwald parse_hex(&ec_q[32], ec_qy_string); 3805df86eb96SMatthias Ringwald sm_have_ec_keypair = 1; 3806df86eb96SMatthias Ringwald ec_key_generation_state = EC_KEY_GENERATION_DONE; 3807a3aba2f9SMatthias Ringwald #endif 38083deb3ec6SMatthias Ringwald } 38093deb3ec6SMatthias Ringwald 3810711e6c80SMatthias Ringwald static sm_connection_t * sm_get_connection_for_handle(hci_con_handle_t con_handle){ 3811711e6c80SMatthias Ringwald hci_connection_t * hci_con = hci_connection_for_handle(con_handle); 38123deb3ec6SMatthias Ringwald if (!hci_con) return NULL; 38133deb3ec6SMatthias Ringwald return &hci_con->sm_connection; 38143deb3ec6SMatthias Ringwald } 38153deb3ec6SMatthias Ringwald 38163deb3ec6SMatthias Ringwald // @returns 0 if not encrypted, 7-16 otherwise 3817711e6c80SMatthias Ringwald int sm_encryption_key_size(hci_con_handle_t con_handle){ 3818711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 38193deb3ec6SMatthias Ringwald if (!sm_conn) return 0; // wrong connection 38203deb3ec6SMatthias Ringwald if (!sm_conn->sm_connection_encrypted) return 0; 38213deb3ec6SMatthias Ringwald return sm_conn->sm_actual_encryption_key_size; 38223deb3ec6SMatthias Ringwald } 38233deb3ec6SMatthias Ringwald 3824711e6c80SMatthias Ringwald int sm_authenticated(hci_con_handle_t con_handle){ 3825711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 38263deb3ec6SMatthias Ringwald if (!sm_conn) return 0; // wrong connection 38273deb3ec6SMatthias Ringwald if (!sm_conn->sm_connection_encrypted) return 0; // unencrypted connection cannot be authenticated 38283deb3ec6SMatthias Ringwald return sm_conn->sm_connection_authenticated; 38293deb3ec6SMatthias Ringwald } 38303deb3ec6SMatthias Ringwald 3831711e6c80SMatthias Ringwald authorization_state_t sm_authorization_state(hci_con_handle_t con_handle){ 3832711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 38333deb3ec6SMatthias Ringwald if (!sm_conn) return AUTHORIZATION_UNKNOWN; // wrong connection 38343deb3ec6SMatthias Ringwald if (!sm_conn->sm_connection_encrypted) return AUTHORIZATION_UNKNOWN; // unencrypted connection cannot be authorized 38353deb3ec6SMatthias Ringwald if (!sm_conn->sm_connection_authenticated) return AUTHORIZATION_UNKNOWN; // unauthenticatd connection cannot be authorized 38363deb3ec6SMatthias Ringwald return sm_conn->sm_connection_authorization_state; 38373deb3ec6SMatthias Ringwald } 38383deb3ec6SMatthias Ringwald 38393deb3ec6SMatthias Ringwald static void sm_send_security_request_for_connection(sm_connection_t * sm_conn){ 38403deb3ec6SMatthias Ringwald switch (sm_conn->sm_engine_state){ 38413deb3ec6SMatthias Ringwald case SM_GENERAL_IDLE: 38423deb3ec6SMatthias Ringwald case SM_RESPONDER_IDLE: 38433deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_RESPONDER_SEND_SECURITY_REQUEST; 38443deb3ec6SMatthias Ringwald sm_run(); 38453deb3ec6SMatthias Ringwald break; 38463deb3ec6SMatthias Ringwald default: 38473deb3ec6SMatthias Ringwald break; 38483deb3ec6SMatthias Ringwald } 38493deb3ec6SMatthias Ringwald } 38503deb3ec6SMatthias Ringwald 38513deb3ec6SMatthias Ringwald /** 38523deb3ec6SMatthias Ringwald * @brief Trigger Security Request 38533deb3ec6SMatthias Ringwald */ 3854711e6c80SMatthias Ringwald void sm_send_security_request(hci_con_handle_t con_handle){ 3855711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 38563deb3ec6SMatthias Ringwald if (!sm_conn) return; 38573deb3ec6SMatthias Ringwald sm_send_security_request_for_connection(sm_conn); 38583deb3ec6SMatthias Ringwald } 38593deb3ec6SMatthias Ringwald 38603deb3ec6SMatthias Ringwald // request pairing 3861711e6c80SMatthias Ringwald void sm_request_pairing(hci_con_handle_t con_handle){ 3862711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 38633deb3ec6SMatthias Ringwald if (!sm_conn) return; // wrong connection 38643deb3ec6SMatthias Ringwald 38653deb3ec6SMatthias Ringwald log_info("sm_request_pairing in role %u, state %u", sm_conn->sm_role, sm_conn->sm_engine_state); 386642134bc6SMatthias Ringwald if (IS_RESPONDER(sm_conn->sm_role)){ 38673deb3ec6SMatthias Ringwald sm_send_security_request_for_connection(sm_conn); 38683deb3ec6SMatthias Ringwald } else { 38693deb3ec6SMatthias Ringwald // used as a trigger to start central/master/initiator security procedures 38703deb3ec6SMatthias Ringwald uint16_t ediv; 38713764b551SMatthias Ringwald sm_key_t ltk; 38723deb3ec6SMatthias Ringwald if (sm_conn->sm_engine_state == SM_INITIATOR_CONNECTED){ 38733deb3ec6SMatthias Ringwald switch (sm_conn->sm_irk_lookup_state){ 38743deb3ec6SMatthias Ringwald case IRK_LOOKUP_FAILED: 38753deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST; 38763deb3ec6SMatthias Ringwald break; 38773deb3ec6SMatthias Ringwald case IRK_LOOKUP_SUCCEEDED: 38783764b551SMatthias Ringwald le_device_db_encryption_get(sm_conn->sm_le_db_index, &ediv, NULL, ltk, NULL, NULL, NULL); 38793764b551SMatthias Ringwald if (!sm_is_null_key(ltk) || ediv){ 38803deb3ec6SMatthias Ringwald log_info("sm: Setting up previous ltk/ediv/rand for device index %u", sm_conn->sm_le_db_index); 38813deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH0_HAS_LTK; 38823deb3ec6SMatthias Ringwald } else { 38833deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_INITIATOR_PH1_W2_SEND_PAIRING_REQUEST; 38843deb3ec6SMatthias Ringwald } 38853deb3ec6SMatthias Ringwald break; 38863deb3ec6SMatthias Ringwald default: 38873deb3ec6SMatthias Ringwald sm_conn->sm_bonding_requested = 1; 38883deb3ec6SMatthias Ringwald break; 38893deb3ec6SMatthias Ringwald } 3890e88b2961SMatthias Ringwald } else if (sm_conn->sm_engine_state == SM_GENERAL_IDLE){ 3891e88b2961SMatthias Ringwald sm_conn->sm_bonding_requested = 1; 38923deb3ec6SMatthias Ringwald } 38933deb3ec6SMatthias Ringwald } 38943deb3ec6SMatthias Ringwald sm_run(); 38953deb3ec6SMatthias Ringwald } 38963deb3ec6SMatthias Ringwald 38973deb3ec6SMatthias Ringwald // called by client app on authorization request 3898711e6c80SMatthias Ringwald void sm_authorization_decline(hci_con_handle_t con_handle){ 3899711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39003deb3ec6SMatthias Ringwald if (!sm_conn) return; // wrong connection 39013deb3ec6SMatthias Ringwald sm_conn->sm_connection_authorization_state = AUTHORIZATION_DECLINED; 39025611a760SMatthias Ringwald sm_notify_client_authorization(SM_EVENT_AUTHORIZATION_RESULT, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address, 0); 39033deb3ec6SMatthias Ringwald } 39043deb3ec6SMatthias Ringwald 3905711e6c80SMatthias Ringwald void sm_authorization_grant(hci_con_handle_t con_handle){ 3906711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39073deb3ec6SMatthias Ringwald if (!sm_conn) return; // wrong connection 39083deb3ec6SMatthias Ringwald sm_conn->sm_connection_authorization_state = AUTHORIZATION_GRANTED; 39095611a760SMatthias Ringwald sm_notify_client_authorization(SM_EVENT_AUTHORIZATION_RESULT, sm_conn->sm_handle, sm_conn->sm_peer_addr_type, sm_conn->sm_peer_address, 1); 39103deb3ec6SMatthias Ringwald } 39113deb3ec6SMatthias Ringwald 39123deb3ec6SMatthias Ringwald // GAP Bonding API 39133deb3ec6SMatthias Ringwald 3914711e6c80SMatthias Ringwald void sm_bonding_decline(hci_con_handle_t con_handle){ 3915711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39163deb3ec6SMatthias Ringwald if (!sm_conn) return; // wrong connection 39173deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_DECLINE; 39183deb3ec6SMatthias Ringwald 39193deb3ec6SMatthias Ringwald if (sm_conn->sm_engine_state == SM_PH1_W4_USER_RESPONSE){ 3920de2fd182SMatthias Ringwald switch (setup->sm_stk_generation_method){ 3921de2fd182SMatthias Ringwald case PK_RESP_INPUT: 3922de2fd182SMatthias Ringwald case PK_INIT_INPUT: 3923de2fd182SMatthias Ringwald case OK_BOTH_INPUT: 3924de2fd182SMatthias Ringwald sm_pairing_error(sm_conn, SM_GENERAL_SEND_PAIRING_FAILED); 3925de2fd182SMatthias Ringwald break; 3926de2fd182SMatthias Ringwald case NK_BOTH_INPUT: 3927de2fd182SMatthias Ringwald sm_pairing_error(sm_conn, SM_REASON_NUMERIC_COMPARISON_FAILED); 3928de2fd182SMatthias Ringwald break; 3929de2fd182SMatthias Ringwald case JUST_WORKS: 3930de2fd182SMatthias Ringwald case OOB: 3931de2fd182SMatthias Ringwald sm_pairing_error(sm_conn, SM_REASON_UNSPECIFIED_REASON); 3932de2fd182SMatthias Ringwald break; 3933de2fd182SMatthias Ringwald } 39343deb3ec6SMatthias Ringwald } 39353deb3ec6SMatthias Ringwald sm_run(); 39363deb3ec6SMatthias Ringwald } 39373deb3ec6SMatthias Ringwald 3938711e6c80SMatthias Ringwald void sm_just_works_confirm(hci_con_handle_t con_handle){ 3939711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39403deb3ec6SMatthias Ringwald if (!sm_conn) return; // wrong connection 39413deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_CONFIRM; 39423deb3ec6SMatthias Ringwald if (sm_conn->sm_engine_state == SM_PH1_W4_USER_RESPONSE){ 3943136d331aSMatthias Ringwald if (setup->sm_use_secure_connections){ 3944c6b7cbd9SMatthias Ringwald sm_conn->sm_engine_state = SM_SC_SEND_PUBLIC_KEY_COMMAND; 3945bbf8db22SMatthias Ringwald } else { 3946bbf8db22SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_C1_GET_RANDOM_A; 3947136d331aSMatthias Ringwald } 39483deb3ec6SMatthias Ringwald } 39490346c37cSMatthias Ringwald 39500346c37cSMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 3951c6b7cbd9SMatthias Ringwald if (sm_conn->sm_engine_state == SM_SC_W4_USER_RESPONSE){ 3952dc300847SMatthias Ringwald sm_sc_prepare_dhkey_check(sm_conn); 3953446a8c36SMatthias Ringwald } 39540346c37cSMatthias Ringwald #endif 39550346c37cSMatthias Ringwald 39563deb3ec6SMatthias Ringwald sm_run(); 39573deb3ec6SMatthias Ringwald } 39583deb3ec6SMatthias Ringwald 3959c8c46d51SMatthias Ringwald void sm_numeric_comparison_confirm(hci_con_handle_t con_handle){ 3960c8c46d51SMatthias Ringwald // for now, it's the same 3961c8c46d51SMatthias Ringwald sm_just_works_confirm(con_handle); 3962c8c46d51SMatthias Ringwald } 3963c8c46d51SMatthias Ringwald 3964711e6c80SMatthias Ringwald void sm_passkey_input(hci_con_handle_t con_handle, uint32_t passkey){ 3965711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39663deb3ec6SMatthias Ringwald if (!sm_conn) return; // wrong connection 39673deb3ec6SMatthias Ringwald sm_reset_tk(); 3968f8fbdce0SMatthias Ringwald big_endian_store_32(setup->sm_tk, 12, passkey); 39693deb3ec6SMatthias Ringwald setup->sm_user_response = SM_USER_RESPONSE_PASSKEY; 39703deb3ec6SMatthias Ringwald if (sm_conn->sm_engine_state == SM_PH1_W4_USER_RESPONSE){ 39713deb3ec6SMatthias Ringwald sm_conn->sm_engine_state = SM_PH2_C1_GET_RANDOM_A; 39723deb3ec6SMatthias Ringwald } 39731c516d8fSMatthias Ringwald #ifdef ENABLE_LE_SECURE_CONNECTIONS 397407036a04SMatthias Ringwald memcpy(setup->sm_ra, setup->sm_tk, 16); 397507036a04SMatthias Ringwald memcpy(setup->sm_rb, setup->sm_tk, 16); 397607036a04SMatthias Ringwald if (sm_conn->sm_engine_state == SM_SC_W4_USER_RESPONSE){ 397707036a04SMatthias Ringwald sm_sc_start_calculating_local_confirm(sm_conn); 397807036a04SMatthias Ringwald } 39791c516d8fSMatthias Ringwald #endif 39803deb3ec6SMatthias Ringwald sm_run(); 39813deb3ec6SMatthias Ringwald } 39823deb3ec6SMatthias Ringwald 39833d7fe1e9SMatthias Ringwald void sm_keypress_notification(hci_con_handle_t con_handle, uint8_t action){ 39843d7fe1e9SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39853d7fe1e9SMatthias Ringwald if (!sm_conn) return; // wrong connection 39863d7fe1e9SMatthias Ringwald if (action > SM_KEYPRESS_PASSKEY_ENTRY_COMPLETED) return; 39873d7fe1e9SMatthias Ringwald setup->sm_keypress_notification = action; 39883d7fe1e9SMatthias Ringwald sm_run(); 39893d7fe1e9SMatthias Ringwald } 39903d7fe1e9SMatthias Ringwald 39913deb3ec6SMatthias Ringwald /** 39923deb3ec6SMatthias Ringwald * @brief Identify device in LE Device DB 39933deb3ec6SMatthias Ringwald * @param handle 39943deb3ec6SMatthias Ringwald * @returns index from le_device_db or -1 if not found/identified 39953deb3ec6SMatthias Ringwald */ 3996711e6c80SMatthias Ringwald int sm_le_device_index(hci_con_handle_t con_handle ){ 3997711e6c80SMatthias Ringwald sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle); 39983deb3ec6SMatthias Ringwald if (!sm_conn) return -1; 39993deb3ec6SMatthias Ringwald return sm_conn->sm_le_db_index; 40003deb3ec6SMatthias Ringwald } 40013deb3ec6SMatthias Ringwald 40028f57b085SMatthias Ringwald static int gap_random_address_type_requires_updates(void){ 40038f57b085SMatthias Ringwald if (gap_random_adress_type == GAP_RANDOM_ADDRESS_TYPE_OFF) return 0; 40048f57b085SMatthias Ringwald if (gap_random_adress_type == GAP_RANDOM_ADDRESS_TYPE_OFF) return 0; 40058f57b085SMatthias Ringwald return 1; 40068f57b085SMatthias Ringwald } 4007d70217a2SMatthias Ringwald 400833373e40SMatthias Ringwald static uint8_t own_address_type(void){ 4009b95a5a35SMatthias Ringwald switch (gap_random_adress_type){ 4010b95a5a35SMatthias Ringwald case GAP_RANDOM_ADDRESS_TYPE_OFF: 4011b95a5a35SMatthias Ringwald return BD_ADDR_TYPE_LE_PUBLIC; 4012b95a5a35SMatthias Ringwald default: 4013b95a5a35SMatthias Ringwald return BD_ADDR_TYPE_LE_RANDOM; 4014b95a5a35SMatthias Ringwald } 401533373e40SMatthias Ringwald } 40168f57b085SMatthias Ringwald 40173deb3ec6SMatthias Ringwald // GAP LE API 40183deb3ec6SMatthias Ringwald void gap_random_address_set_mode(gap_random_address_type_t random_address_type){ 40193deb3ec6SMatthias Ringwald gap_random_address_update_stop(); 40203deb3ec6SMatthias Ringwald gap_random_adress_type = random_address_type; 4021b95a5a35SMatthias Ringwald hci_le_set_own_address_type(own_address_type()); 40228f57b085SMatthias Ringwald if (!gap_random_address_type_requires_updates()) return; 40233deb3ec6SMatthias Ringwald gap_random_address_update_start(); 40243deb3ec6SMatthias Ringwald gap_random_address_trigger(); 40253deb3ec6SMatthias Ringwald } 40263deb3ec6SMatthias Ringwald 40273deb3ec6SMatthias Ringwald gap_random_address_type_t gap_random_address_get_mode(void){ 40283deb3ec6SMatthias Ringwald return gap_random_adress_type; 40293deb3ec6SMatthias Ringwald } 40303deb3ec6SMatthias Ringwald 40313deb3ec6SMatthias Ringwald void gap_random_address_set_update_period(int period_ms){ 40323deb3ec6SMatthias Ringwald gap_random_adress_update_period = period_ms; 40338f57b085SMatthias Ringwald if (!gap_random_address_type_requires_updates()) return; 40343deb3ec6SMatthias Ringwald gap_random_address_update_stop(); 40353deb3ec6SMatthias Ringwald gap_random_address_update_start(); 40363deb3ec6SMatthias Ringwald } 40373deb3ec6SMatthias Ringwald 40387e252622SMatthias Ringwald void gap_random_address_set(bd_addr_t addr){ 40398f57b085SMatthias Ringwald gap_random_address_set_mode(GAP_RANDOM_ADDRESS_TYPE_STATIC); 40407e252622SMatthias Ringwald memcpy(sm_random_address, addr, 6); 40415777861bSMatthias Ringwald if (rau_state == RAU_W4_WORKING) return; 40427e252622SMatthias Ringwald rau_state = RAU_SET_ADDRESS; 40437e252622SMatthias Ringwald sm_run(); 40447e252622SMatthias Ringwald } 40457e252622SMatthias Ringwald 4046d70217a2SMatthias Ringwald #ifdef ENABLE_LE_PERIPHERAL 40473deb3ec6SMatthias Ringwald /* 40483deb3ec6SMatthias Ringwald * @brief Set Advertisement Paramters 40493deb3ec6SMatthias Ringwald * @param adv_int_min 40503deb3ec6SMatthias Ringwald * @param adv_int_max 40513deb3ec6SMatthias Ringwald * @param adv_type 40523deb3ec6SMatthias Ringwald * @param direct_address_type 40533deb3ec6SMatthias Ringwald * @param direct_address 40543deb3ec6SMatthias Ringwald * @param channel_map 40553deb3ec6SMatthias Ringwald * @param filter_policy 40563deb3ec6SMatthias Ringwald * 40573deb3ec6SMatthias Ringwald * @note own_address_type is used from gap_random_address_set_mode 40583deb3ec6SMatthias Ringwald */ 40593deb3ec6SMatthias Ringwald void gap_advertisements_set_params(uint16_t adv_int_min, uint16_t adv_int_max, uint8_t adv_type, 40603deb3ec6SMatthias Ringwald uint8_t direct_address_typ, bd_addr_t direct_address, uint8_t channel_map, uint8_t filter_policy){ 4061b95a5a35SMatthias Ringwald hci_le_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 40623deb3ec6SMatthias Ringwald direct_address_typ, direct_address, channel_map, filter_policy); 40633deb3ec6SMatthias Ringwald } 4064d70217a2SMatthias Ringwald #endif 40653deb3ec6SMatthias Ringwald 4066