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 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 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 79 void nrf_ecb_set_key(const uint8_t * key) 80 { 81 memcpy(ecb_key,key,16); 82 } 83 84 85