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/*******************************************************************************
* Copyright (C) 2020, Huada Semiconductor Co., Ltd. All rights reserved.
*
* This software component is licensed by HDSC under BSD 3-Clause license
* (the "License"); You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*/
/******************************************************************************/
/** \file hc32f460_aes.c
**
** A detailed description is available at
** @link AesGroup Aes description @endlink
**
** - 2018-10-20 CDT First version for Device Driver Library of Aes.
**
******************************************************************************/
/*******************************************************************************
* Include files
******************************************************************************/
#include "hc32f460_aes.h"
#include "hc32f460_utility.h"
/**
*******************************************************************************
** \addtogroup AesGroup
******************************************************************************/
//@{
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
/* AES block length in bytes is 16. */
#define AES_BLOCK_LEN ((uint8_t)16)
/* Each encryption operation takes 440 system clock cycles. */
#define AES_ENCRYPT_TIMEOUT (440u)
/* Each decryption operation takes 580 system clock cycles. */
#define AES_DECRYPT_TIMEOUT (580u)
/*******************************************************************************
* Global variable definitions (declared in header file with 'extern')
******************************************************************************/
/*******************************************************************************
* Local function prototypes ('static')
******************************************************************************/
static void AES_WriteData(const uint8_t *pu8SrcData);
static void AES_ReadData(uint8_t *pu8Dest);
static void AES_WriteKey(const uint8_t *pu8Key);
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief AES128 encryption(ECB mode).
**
** \param [in] pu8Plaintext Pointer to plaintext(the source data which will be encrypted)
**
** \param [in] u32PlaintextSize Length of plaintext in bytes.
**
** \param [in] pu8Key Pointer to the AES key.
**
** \param [out] pu8Ciphertext The destination address to store the result of the encryption.
**
** \retval Ok No error occurred.
** \retval ErrorTimeout AES works timeout.
** \retval ErrorInvalidParameter Parameter error.
**
******************************************************************************/
en_result_t AES_Encrypt(const uint8_t *pu8Plaintext,
uint32_t u32PlaintextSize,
const uint8_t *pu8Key,
uint8_t *pu8Ciphertext)
{
en_result_t enRet = ErrorInvalidParameter;
uint32_t u32BlockOffset;
uint32_t u32Index;
__IO uint32_t u32TimeCount;
if ((NULL != pu8Plaintext) &&
(0u != u32PlaintextSize) &&
(NULL != pu8Key) &&
(NULL != pu8Ciphertext) &&
(0u == (u32PlaintextSize & 0xFu)) && /* u32PlaintextSize % AES_BLOCK_LEN */
(0u == ((uint32_t)pu8Plaintext & 0x3u)) && /* (uint32_t)pu8Ciphertext % 4u */
(0u == ((uint32_t)pu8Key & 0x3u)) && /* (uint32_t)pu8Key % 4u */
(0u == ((uint32_t)pu8Ciphertext & 0x3u))) /* (uint32_t)pu8Plaintext % 4u */
{
/* Write the key to the register. */
AES_WriteKey(pu8Key);
u32BlockOffset = 0u;
while (0u != u32PlaintextSize)
{
/* Stop AES calculating. */
bM4_AES_CR_START = 0u;
/* Write data. */
u32Index = u32BlockOffset * AES_BLOCK_LEN;
AES_WriteData(&pu8Plaintext[u32Index]);
/* Set AES encrypt. */
bM4_AES_CR_MODE = 0u;
/* Start AES calculating. */
bM4_AES_CR_START = 1u;
enRet = ErrorTimeout;
u32TimeCount = 0u;
while (u32TimeCount < AES_ENCRYPT_TIMEOUT)
{
if (bM4_AES_CR_START == 0u)
{
enRet = Ok;
break;
}
u32TimeCount++;
}
if (enRet == ErrorTimeout)
{
break;
}
AES_ReadData(&pu8Ciphertext[u32Index]);
u32PlaintextSize -= AES_BLOCK_LEN;
u32BlockOffset++;
}
/* Stop AES calculating. */
bM4_AES_CR_START = 0u;
}
return enRet;
}
/**
*******************************************************************************
** \brief AES128 decryption(ECB mode).
**
** \param [in] pu8Ciphertext Pointer to ciphertext(the source data which will be decrypted)
**
** \param [in] u32CiphertextSize Length of ciphertext in bytes.
**
** \param [in] pu8Key Pointer to the AES key.
**
** \param [out] pu8Plaintext The destination address to store the result of the decryption.
**
** \retval Ok No error occurred.
** \retval ErrorTimeout AES works timeout.
** \retval ErrorInvalidParameter Parameter error.
**
******************************************************************************/
en_result_t AES_Decrypt(const uint8_t *pu8Ciphertext,
uint32_t u32CiphertextSize,
const uint8_t *pu8Key,
uint8_t *pu8Plaintext)
{
en_result_t enRet = ErrorInvalidParameter;
uint32_t u32BlockOffset;
uint32_t u32Index;
__IO uint32_t u32TimeCount;
if ((NULL != pu8Ciphertext) &&
(0u != u32CiphertextSize) &&
(NULL != pu8Key) &&
(NULL != pu8Plaintext) &&
(0u == (u32CiphertextSize & 0xFu)) && /* u32CiphertextSize % AES_BLOCK_LEN */
(0u == ((uint32_t)pu8Ciphertext & 0x3u)) && /* (uint32_t)pu8Ciphertext % 4u */
(0u == ((uint32_t)pu8Key & 0x3u)) && /* (uint32_t)pu8Key % 4u */
(0u == ((uint32_t)pu8Plaintext & 0x3u))) /* (uint32_t)pu8Plaintext % 4u */
{
/* Write the key to the register. */
AES_WriteKey(pu8Key);
u32BlockOffset = 0u;
while (0u != u32CiphertextSize)
{
/* Stop AES calculating. */
bM4_AES_CR_START = 0u;
/* Write data. */
u32Index = u32BlockOffset * AES_BLOCK_LEN;
AES_WriteData(&pu8Ciphertext[u32Index]);
/* Set AES decrypt. */
bM4_AES_CR_MODE = 1u;
/* Start AES calculating. */
bM4_AES_CR_START = 1u;
enRet = ErrorTimeout;
u32TimeCount = 0u;
while (u32TimeCount < AES_DECRYPT_TIMEOUT)
{
if (bM4_AES_CR_START == 0u)
{
enRet = Ok;
break;
}
u32TimeCount++;
}
if (enRet == ErrorTimeout)
{
break;
}
AES_ReadData(&pu8Plaintext[u32Index]);
u32CiphertextSize -= AES_BLOCK_LEN;
u32BlockOffset++;
}
/* Stop AES calculating. */
bM4_AES_CR_START = 0u;
}
return enRet;
}
/*******************************************************************************
* Function implementation - local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief Writes the input buffer in data register.
**
** \param [in] pu8SrcData Pointer to source data buffer.
**
** \retval None.
**
******************************************************************************/
static void AES_WriteData(const uint8_t *pu8SrcData)
{
uint8_t i;
uint32_t u32SrcAddr = (uint32_t)pu8SrcData;
uint32_t u32DrAddr = (uint32_t)&(M4_AES->DR0);
for (i = 0u; i < 4u; i++)
{
*(__IO uint32_t *)u32DrAddr = *(uint32_t*)u32SrcAddr;
u32SrcAddr += 4u;
u32DrAddr += 4u;
}
}
/**
*******************************************************************************
** \brief Reads the from data register.
**
** \param [out] pu8Dest Pointer to the destination buffer.
**
** \retval None.
**
******************************************************************************/
static void AES_ReadData(uint8_t *pu8Dest)
{
uint8_t i;
uint32_t u32DestAddr = (uint32_t)pu8Dest;
uint32_t u32DrAddr = (uint32_t)&(M4_AES->DR0);
for (i = 0u; i < 4u; i++)
{
*(uint32_t*)u32DestAddr = *(__IO uint32_t *)u32DrAddr;
u32DestAddr += 4u;
u32DrAddr += 4u;
}
}
/**
*******************************************************************************
** \brief Writes the input buffer in key register.
**
** \param [in] pu8Key Pointer to AES key.
**
** \retval None.
**
******************************************************************************/
static void AES_WriteKey(const uint8_t *pu8Key)
{
uint8_t i;
uint32_t u32SrcKeyAddr = (uint32_t)pu8Key;
uint32_t u32KeyAddr = (uint32_t)&(M4_AES->KR0);
for (i = 0u; i < 4u; i++)
{
*(__IO uint32_t *)u32KeyAddr = *(uint32_t*)u32SrcKeyAddr;
u32SrcKeyAddr += 4u;
u32KeyAddr += 4u;
}
}
//@} // AesGroup
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
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