1 /*
2 * Copyright (c) 2012 - 2018, Nordic Semiconductor ASA
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 //lint -e438
33
34 #include <nrfx.h>
35 #include "nrf_ecb.h"
36 #include <string.h>
37
38 static uint8_t ecb_data[48]; ///< ECB data structure for RNG peripheral to access.
39 static uint8_t* ecb_key; ///< Key: Starts at ecb_data
40 static uint8_t* ecb_cleartext; ///< Cleartext: Starts at ecb_data + 16 bytes.
41 static uint8_t* ecb_ciphertext; ///< Ciphertext: Starts at ecb_data + 32 bytes.
42
nrf_ecb_init(void)43 bool nrf_ecb_init(void)
44 {
45 ecb_key = ecb_data;
46 ecb_cleartext = ecb_data + 16;
47 ecb_ciphertext = ecb_data + 32;
48
49 NRF_ECB->ECBDATAPTR = (uint32_t)ecb_data;
50 return true;
51 }
52
53
nrf_ecb_crypt(uint8_t * dest_buf,const uint8_t * src_buf)54 bool nrf_ecb_crypt(uint8_t * dest_buf, const uint8_t * src_buf)
55 {
56 uint32_t counter = 0x1000000;
57 if (src_buf != ecb_cleartext)
58 {
59 memcpy(ecb_cleartext,src_buf,16);
60 }
61 NRF_ECB->EVENTS_ENDECB = 0;
62 NRF_ECB->TASKS_STARTECB = 1;
63 while (NRF_ECB->EVENTS_ENDECB == 0)
64 {
65 counter--;
66 if (counter == 0)
67 {
68 return false;
69 }
70 }
71 NRF_ECB->EVENTS_ENDECB = 0;
72 if (dest_buf != ecb_ciphertext)
73 {
74 memcpy(dest_buf,ecb_ciphertext,16);
75 }
76 return true;
77 }
78
nrf_ecb_set_key(const uint8_t * key)79 void nrf_ecb_set_key(const uint8_t * key)
80 {
81 memcpy(ecb_key,key,16);
82 }
83
84
85