101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/**
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* Copyright (c) 2012 - 2017, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**
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* @file
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* @brief Implementation of AES ECB driver
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*/
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//lint -e438
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include "nrf.h"
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#include "nrf_ecb.h"
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static uint8_t ecb_data[48]; ///< ECB data structure for RNG peripheral to access.
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static uint8_t* ecb_key; ///< Key: Starts at ecb_data
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static uint8_t* ecb_cleartext; ///< Cleartext: Starts at ecb_data + 16 bytes.
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static uint8_t* ecb_ciphertext; ///< Ciphertext: Starts at ecb_data + 32 bytes.
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bool nrf_ecb_init(void)
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{
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ecb_key = ecb_data;
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ecb_cleartext = ecb_data + 16;
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ecb_ciphertext = ecb_data + 32;
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NRF_ECB->ECBDATAPTR = (uint32_t)ecb_data;
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return true;
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}
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bool nrf_ecb_crypt(uint8_t * dest_buf, const uint8_t * src_buf)
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{
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uint32_t counter = 0x1000000;
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if (src_buf != ecb_cleartext)
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{
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memcpy(ecb_cleartext,src_buf,16);
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}
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NRF_ECB->EVENTS_ENDECB = 0;
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NRF_ECB->TASKS_STARTECB = 1;
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while (NRF_ECB->EVENTS_ENDECB == 0)
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{
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counter--;
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if (counter == 0)
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{
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return false;
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}
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}
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NRF_ECB->EVENTS_ENDECB = 0;
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if (dest_buf != ecb_ciphertext)
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{
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memcpy(dest_buf,ecb_ciphertext,16);
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}
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return true;
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}
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void nrf_ecb_set_key(const uint8_t * key)
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{
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memcpy(ecb_key,key,16);
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}
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