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nrf_ecb.c
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00001 /* 00002 * Copyright (c) Nordic Semiconductor ASA 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without modification, 00006 * are permitted provided that the following conditions are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright notice, this 00009 * list of conditions and the following disclaimer. 00010 * 00011 * 2. Redistributions in binary form must reproduce the above copyright notice, this 00012 * list of conditions and the following disclaimer in the documentation and/or 00013 * other materials provided with the distribution. 00014 * 00015 * 3. Neither the name of Nordic Semiconductor ASA nor the names of other 00016 * contributors to this software may be used to endorse or promote products 00017 * derived from this software without specific prior written permission. 00018 * 00019 * 00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 00021 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00022 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00023 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 00024 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00025 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00026 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 00027 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00028 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00029 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00030 * 00031 */ 00032 00033 /** 00034 * @file 00035 * @brief Implementation of AES ECB driver 00036 */ 00037 00038 00039 //lint -e438 00040 00041 #include <stdlib.h> 00042 #include <stdbool.h> 00043 #include <string.h> 00044 #include "nrf.h" 00045 #include "nrf_ecb.h" 00046 00047 static uint8_t ecb_data[48]; ///< ECB data structure for RNG peripheral to access. 00048 static uint8_t* ecb_key; ///< Key: Starts at ecb_data 00049 static uint8_t* ecb_cleartext; ///< Cleartext: Starts at ecb_data + 16 bytes. 00050 static uint8_t* ecb_ciphertext; ///< Ciphertext: Starts at ecb_data + 32 bytes. 00051 00052 bool nrf_ecb_init(void) 00053 { 00054 ecb_key = ecb_data; 00055 ecb_cleartext = ecb_data + 16; 00056 ecb_ciphertext = ecb_data + 32; 00057 00058 NRF_ECB->ECBDATAPTR = (uint32_t)ecb_data; 00059 return true; 00060 } 00061 00062 00063 bool nrf_ecb_crypt(uint8_t * dest_buf, const uint8_t * src_buf) 00064 { 00065 uint32_t counter = 0x1000000; 00066 if(src_buf != ecb_cleartext) 00067 { 00068 memcpy(ecb_cleartext,src_buf,16); 00069 } 00070 NRF_ECB->EVENTS_ENDECB = 0; 00071 NRF_ECB->TASKS_STARTECB = 1; 00072 while(NRF_ECB->EVENTS_ENDECB == 0) 00073 { 00074 counter--; 00075 if(counter == 0) 00076 { 00077 return false; 00078 } 00079 } 00080 NRF_ECB->EVENTS_ENDECB = 0; 00081 if(dest_buf != ecb_ciphertext) 00082 { 00083 memcpy(dest_buf,ecb_ciphertext,16); 00084 } 00085 return true; 00086 } 00087 00088 void nrf_ecb_set_key(const uint8_t * key) 00089 { 00090 memcpy(ecb_key,key,16); 00091 } 00092 00093
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