1 /* 2 * Copyright (C) 2015-2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <stdint.h> 20 21 #define DEBUG_MAC_VALUES 0 22 23 struct key { 24 uint8_t byte[32]; 25 }; 26 27 struct mac { 28 uint8_t byte[16]; 29 }; 30 31 struct iv { 32 uint8_t byte[16]; 33 }; 34 #define IV_INITIAL_ZERO_VALUE(iv) \ 35 { \ 36 { 0 } \ 37 } 38 39 #if DEBUG_MAC_VALUES 40 #define UINT8_16_PRINTF_STR \ 41 "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x" 42 #define UINT8_16_PRINTF_ARGS(var) \ 43 var[0], var[1], var[2], var[3], var[4], var[5], var[6], var[7], var[8], \ 44 var[9], var[10], var[11], var[12], var[13], var[14], var[15] 45 #else 46 #define UINT8_16_PRINTF_STR "%c" 47 #define UINT8_16_PRINTF_ARGS(var) '*' 48 #endif 49 50 #define MAC_PRINTF_STR UINT8_16_PRINTF_STR 51 #define MAC_PRINTF_ARGS(var) UINT8_16_PRINTF_ARGS((var)->byte) 52 #define IV_PRINTF_STR UINT8_16_PRINTF_STR 53 #define IV_PRINTF_ARGS(var) UINT8_16_PRINTF_ARGS((var)->byte) 54 55 uint64_t str_hash(const char* str); 56 57 int calculate_mac(const struct key* key, 58 struct mac* mac, 59 const void* data, 60 size_t data_size); 61 62 int generate_iv(struct iv* iv_out); 63 64 int storage_encrypt(const struct key* key, 65 void* data_in_out, 66 size_t data_size, 67 const struct iv* iv_in); 68 69 int storage_decrypt(const struct key* key, 70 void* data_in_out, 71 size_t data_size, 72 const struct iv* iv_in); 73 74 void crypt_init(void); 75 76 void crypt_shutdown(void); 77