nuc472_crypto_hash.c

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/**
 * @file nuc472_crypto_hash.c
 * @brief NUC472 hash hardware accelerator
 *
 * @section License
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Copyright (C) 2010-2025 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneCRYPTO Open.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 2.5.0
 **/
 
//Switch to the appropriate trace level
#define TRACE_LEVEL CRYPTO_TRACE_LEVEL
 
//Dependencies
#include "nuc472_442.h"
#include "core/crypto.h"
#include "hardware/nuc472/nuc472_crypto.h"
#include "hardware/nuc472/nuc472_crypto_hash.h"
#include "hash/hash_algorithms.h"
#include "debug.h"
 
//Check crypto library configuration
#if (NUC472_CRYPTO_HASH_SUPPORT == ENABLED)
 
 
/**
 * @brief Update hash value
 * @param[in] data Pointer to the input buffer
 * @param[in] length Length of the input buffer
 **/
 
void hashProcessData(const uint8_t *data, size_t length)
{
   size_t i;
 
   //Process input data
   for(i = 0; i < length; i += 4)
   {
      //Wait for the DATINREQ bit to be set
      while((CRPT->SHA_STS & CRPT_SHA_STS_DATINREQ_Msk) == 0)
      {
      }
 
      //Write one word of data
      CRPT->SHA_DATIN = __UNALIGNED_UINT32_READ(data + i);
   }
 
   //Wait for the processing to complete
   while((CRPT->SHA_STS & CRPT_SHA_STS_DATINREQ_Msk) == 0)
   {
   }
}
 
 
#if (SHA1_SUPPORT == ENABLED)
 
/**
 * @brief Digest a message using SHA-1
 * @param[in] data Pointer to the message being hashed
 * @param[in] length Length of the message
 * @param[out] digest Pointer to the calculated digest
 * @return Error code
 **/
 
error_t sha1Compute(const void *data, size_t length, uint8_t *digest)
{
   size_t n;
   uint32_t temp;
   uint8_t buffer[64];
 
   //Acquire exclusive access to the CRYPTO module
   osAcquireMutex(&nuc472CryptoMutex);
 
   //Reset CRYPTO controller
   SYS->IPRST0 |= SYS_IPRST0_CRPTRST_Msk;
   SYS->IPRST0 &= ~SYS_IPRST0_CRPTRST_Msk;
 
   //Select the relevant hash algorithm
   CRPT->SHA_CTL = CRPT_SHA_CTL_INSWAP_Msk | CRPT_SHA_CTL_OUTSWAP_Msk |
      CRPT_SHA_CTL_OPMODE_SHA1;
 
   //Start SHA engine
   CRPT->SHA_CTL |= CRPT_SHA_CTL_START_Msk;
 
   //Digest the message
   for(n = length; n >= 64; n -= 64)
   {
      //Update hash value
      hashProcessData(data, 64);
      //Advance the data pointer
      data = (uint8_t *) data + 64;
   }
 
   //Copy the partial block, is any
   osMemset(buffer, 0, 64);
   osMemcpy(buffer, data, n);
 
   //Append the first byte of the padding string
   buffer[n] = 0x80;
 
   //Pad the message so that its length is congruent to 56 modulo 64
   if(n >= 56)
   {
      hashProcessData(buffer, 64);
      osMemset(buffer, 0, 64);
   }
 
   //Append the length of the original message
   STORE64BE(length * 8, buffer + 56);
 
   //Process the final block
   hashProcessData(buffer, 64);
 
   //Save the resulting hash value
   temp = CRPT->SHA_DGST0;
   __UNALIGNED_UINT32_WRITE(digest, temp);
   temp = CRPT->SHA_DGST1;
   __UNALIGNED_UINT32_WRITE(digest + 4, temp);
   temp = CRPT->SHA_DGST2;
   __UNALIGNED_UINT32_WRITE(digest + 8, temp);
   temp = CRPT->SHA_DGST3;
   __UNALIGNED_UINT32_WRITE(digest + 12, temp);
   temp = CRPT->SHA_DGST4;
   __UNALIGNED_UINT32_WRITE(digest + 16, temp);
 
   //Stop SHA engine
   CRPT->SHA_CTL |= CRPT_SHA_CTL_STOP_Msk;
 
   //Release exclusive access to the CRYPTO module
   osReleaseMutex(&nuc472CryptoMutex);
 
   //Sucessful processing
   return NO_ERROR;
}
 
#endif
#if (SHA224_SUPPORT == ENABLED)
 
/**
 * @brief Digest a message using SHA-224
 * @param[in] data Pointer to the message being hashed
 * @param[in] length Length of the message
 * @param[out] digest Pointer to the calculated digest
 * @return Error code
 **/
 
error_t sha224Compute(const void *data, size_t length, uint8_t *digest)
{
   size_t n;
   uint32_t temp;
   uint8_t buffer[64];
 
   //Acquire exclusive access to the CRYPTO module
   osAcquireMutex(&nuc472CryptoMutex);
 
   //Reset CRYPTO controller
   SYS->IPRST0 |= SYS_IPRST0_CRPTRST_Msk;
   SYS->IPRST0 &= ~SYS_IPRST0_CRPTRST_Msk;
 
   //Select the relevant hash algorithm
   CRPT->SHA_CTL = CRPT_SHA_CTL_INSWAP_Msk | CRPT_SHA_CTL_OUTSWAP_Msk |
      CRPT_SHA_CTL_OPMODE_SHA224;
 
   //Start SHA engine
   CRPT->SHA_CTL |= CRPT_SHA_CTL_START_Msk;
 
   //Digest the message
   for(n = length; n >= 64; n -= 64)
   {
      //Update hash value
      hashProcessData(data, 64);
      //Advance the data pointer
      data = (uint8_t *) data + 64;
   }
 
   //Copy the partial block, is any
   osMemset(buffer, 0, 64);
   osMemcpy(buffer, data, n);
 
   //Append the first byte of the padding string
   buffer[n] = 0x80;
 
   //Pad the message so that its length is congruent to 56 modulo 64
   if(n >= 56)
   {
      hashProcessData(buffer, 64);
      osMemset(buffer, 0, 64);
   }
 
   //Append the length of the original message
   STORE64BE(length * 8, buffer + 56);
 
   //Process the final block
   hashProcessData(buffer, 64);
 
   //Save the resulting hash value
   temp = CRPT->SHA_DGST0;
   __UNALIGNED_UINT32_WRITE(digest, temp);
   temp = CRPT->SHA_DGST1;
   __UNALIGNED_UINT32_WRITE(digest + 4, temp);
   temp = CRPT->SHA_DGST2;
   __UNALIGNED_UINT32_WRITE(digest + 8, temp);
   temp = CRPT->SHA_DGST3;
   __UNALIGNED_UINT32_WRITE(digest + 12, temp);
   temp = CRPT->SHA_DGST4;
   __UNALIGNED_UINT32_WRITE(digest + 16, temp);
   temp = CRPT->SHA_DGST5;
   __UNALIGNED_UINT32_WRITE(digest + 20, temp);
   temp = CRPT->SHA_DGST6;
   __UNALIGNED_UINT32_WRITE(digest + 24, temp);
 
   //Stop SHA engine
   CRPT->SHA_CTL |= CRPT_SHA_CTL_STOP_Msk;
 
   //Release exclusive access to the CRYPTO module
   osReleaseMutex(&nuc472CryptoMutex);
 
   //Sucessful processing
   return NO_ERROR;
}
 
#endif
#if (SHA256_SUPPORT == ENABLED)
 
/**
 * @brief Digest a message using SHA-256
 * @param[in] data Pointer to the message being hashed
 * @param[in] length Length of the message
 * @param[out] digest Pointer to the calculated digest
 * @return Error code
 **/
 
error_t sha256Compute(const void *data, size_t length, uint8_t *digest)
{
   size_t n;
   uint32_t temp;
   uint8_t buffer[64];
 
   //Acquire exclusive access to the CRYPTO module
   osAcquireMutex(&nuc472CryptoMutex);
 
   //Reset CRYPTO controller
   SYS->IPRST0 |= SYS_IPRST0_CRPTRST_Msk;
   SYS->IPRST0 &= ~SYS_IPRST0_CRPTRST_Msk;
 
   //Select the relevant hash algorithm
   CRPT->SHA_CTL = CRPT_SHA_CTL_INSWAP_Msk | CRPT_SHA_CTL_OUTSWAP_Msk |
      CRPT_SHA_CTL_OPMODE_SHA256;
 
   //Start SHA engine
   CRPT->SHA_CTL |= CRPT_SHA_CTL_START_Msk;
 
   //Digest the message
   for(n = length; n >= 64; n -= 64)
   {
      //Update hash value
      hashProcessData(data, 64);
      //Advance the data pointer
      data = (uint8_t *) data + 64;
   }
 
   //Copy the partial block, is any
   osMemset(buffer, 0, 64);
   osMemcpy(buffer, data, n);
 
   //Append the first byte of the padding string
   buffer[n] = 0x80;
 
   //Pad the message so that its length is congruent to 56 modulo 64
   if(n >= 56)
   {
      hashProcessData(buffer, 64);
      osMemset(buffer, 0, 64);
   }
 
   //Append the length of the original message
   STORE64BE(length * 8, buffer + 56);
 
   //Process the final block
   hashProcessData(buffer, 64);
 
   //Save the resulting hash value
   temp = CRPT->SHA_DGST0;
   __UNALIGNED_UINT32_WRITE(digest, temp);
   temp = CRPT->SHA_DGST1;
   __UNALIGNED_UINT32_WRITE(digest + 4, temp);
   temp = CRPT->SHA_DGST2;
   __UNALIGNED_UINT32_WRITE(digest + 8, temp);
   temp = CRPT->SHA_DGST3;
   __UNALIGNED_UINT32_WRITE(digest + 12, temp);
   temp = CRPT->SHA_DGST4;
   __UNALIGNED_UINT32_WRITE(digest + 16, temp);
   temp = CRPT->SHA_DGST5;
   __UNALIGNED_UINT32_WRITE(digest + 20, temp);
   temp = CRPT->SHA_DGST6;
   __UNALIGNED_UINT32_WRITE(digest + 24, temp);
   temp = CRPT->SHA_DGST7;
   __UNALIGNED_UINT32_WRITE(digest + 28, temp);
 
   //Stop SHA engine
   CRPT->SHA_CTL |= CRPT_SHA_CTL_STOP_Msk;
 
   //Release exclusive access to the CRYPTO module
   osReleaseMutex(&nuc472CryptoMutex);
 
   //Sucessful processing
   return NO_ERROR;
}
 
#endif
#endif