owner-nrf52sdk/nRF5_SDK_17.0.2/modules/nrfx/hal/nrf_ecb.c

/**
 * Copyright (c) 2012 - 2020, 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.
 *
 */

#include <nrfx.h>
#include "nrf_ecb.h"
#include <string.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);
}