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