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/**
*******************************************************************************
* @file hc32f4a0_aes.c
* @brief This file provides firmware functions to manage the Advanced Encryption
* Standard(AES).
@verbatim
Change Logs:
Date Author Notes
2020-06-12 Heqb First version
@endverbatim
*******************************************************************************
* 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
*
*******************************************************************************
*/
/*******************************************************************************
* Include files
******************************************************************************/
#include "hc32f4a0_aes.h"
#include "hc32f4a0_utility.h"
/**
* @addtogroup HC32F4A0_DDL_Driver
* @{
*/
/**
* @defgroup DDL_AES AES
* @brief AES Driver Library
* @{
*/
#if (DDL_AES_ENABLE == DDL_ON)
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
/**
* @defgroup AES_Local_Macros AES Local Macros
* @{
*/
/* Delay count for timeout */
#define AES_TIMEOUT (30000UL)
/**
* @defgroup AES_KEY_LENGTH AES key length in bytes
* @{
*/
#define AES_KEY_LEN_128BIT (16U)
#define AES_KEY_LEN_192BIT (24U)
#define AES_KEY_LEN_256BIT (32U)
/**
* @}
*/
/**
* @defgroup AES_Check_Parameters_Validity AES Check Parameters Validity
* @{
*/
#define IS_AES_KEYLENGTH(x) \
( ((x) == AES_KEY_LEN_128BIT) || \
((x) == AES_KEY_LEN_192BIT) || \
((x) == AES_KEY_LEN_256BIT))
/**
* @}
*/
/**
* @}
*/
/*******************************************************************************
* 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(const uint8_t *pu8Result);
static void AES_WriteKey(const uint8_t *pu8Key, uint8_t u8KeyLength);
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
* @defgroup AES_Global_Functions AES Global Functions
* @{
*/
/**
* @brief AES encryption.
* @param [in] au8Plaintext Buffer of the 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 [in] u8KeyLength Buffer of the key in bytes.
* @param [out] au8Ciphertext Buffer of the ciphertext.
* @retval An en_result_t enumeration value:
* Ok: Encryption successfully.
* ErrorInvalidParameter: Invalid parameter
* ErrorTimeout: Encryption error timeout
*/
en_result_t AES_Encrypt(uint8_t au8Plaintext[],
uint32_t u32PlaintextSize,
const uint8_t *pu8Key,
uint8_t u8KeyLength,
uint8_t au8Ciphertext[])
{
en_result_t enRet = ErrorInvalidParameter;
uint32_t u32TimeCount = 0UL;
uint32_t u32Index = 0UL;
uint8_t au8FillBuffer[16U] = {0U};
if((au8Plaintext != NULL) && (u32PlaintextSize != 0UL) \
&& (pu8Key != NULL) && (u8KeyLength != 0U) \
&& (au8Ciphertext != NULL))
{
DDL_ASSERT(IS_AES_KEYLENGTH(u8KeyLength));
enRet = Ok;
while(u32PlaintextSize > 0UL)
{
/* Wait for AES to stop */
while(READ_REG32_BIT(M4_AES->CR, AES_CR_START) == 1U)
{
if(u32TimeCount++ >= AES_TIMEOUT)
{
enRet = ErrorTimeout;
break;
}
}
if (enRet == Ok)
{
if (u32PlaintextSize >= AES_BLOCK_LEN)
{
AES_WriteData(&au8Plaintext[u32Index]);
}
else
{
(void)memcpy(au8FillBuffer, &au8Plaintext[u32Index], u32PlaintextSize);
AES_WriteData(&au8FillBuffer[0U]);
}
AES_WriteKey(pu8Key, u8KeyLength);
switch (u8KeyLength)
{
case AES_KEY_LEN_128BIT:
MODIFY_REG32(M4_AES->CR, AES_CR_KEYSIZE, AES_KEY_SIZE_128BIT);
break;
case AES_KEY_LEN_192BIT:
MODIFY_REG32(M4_AES->CR, AES_CR_KEYSIZE, AES_KEY_SIZE_192BIT);
break;
case AES_KEY_LEN_256BIT:
MODIFY_REG32(M4_AES->CR, AES_CR_KEYSIZE, AES_KEY_SIZE_256BIT);
break;
default:
break;
}
/* Set AES encrypt. */
CLEAR_REG32_BIT(M4_AES->CR, AES_CR_MODE);
/* Start AES calculating. */
SET_REG32_BIT(M4_AES->CR, AES_CR_START);
/* Wait for AES to stop */
u32TimeCount = 0UL;
while(READ_REG32_BIT(M4_AES->CR, AES_CR_START) == 1U)
{
if(u32TimeCount++ > AES_TIMEOUT)
{
enRet = ErrorTimeout;
break;
}
}
if (enRet == Ok)
{
AES_ReadData(&au8Ciphertext[u32Index]);
if (u32PlaintextSize < AES_BLOCK_LEN)
{
u32PlaintextSize = 0UL;
}
else
{
u32PlaintextSize -= AES_BLOCK_LEN;
}
u32Index += AES_BLOCK_LEN;
}
}
}
}
return enRet;
}
/**
* @brief AES decryption.
* @param [in] au8Ciphertext Buffer of the 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 [in] u8KeyLength Length of key in bytes.
* @param [out] au8Plaintext Buffer of the plaintext.
* @retval An en_result_t enumeration value:
* Ok: Decryption successfully.
* ErrorInvalidParameter: Invalid parameter
* ErrorTimeout: Decryption error timeout
*/
en_result_t AES_Decrypt(uint8_t au8Ciphertext[],
uint32_t u32CiphertextSize,
const uint8_t *pu8Key,
uint8_t u8KeyLength,
uint8_t au8Plaintext[])
{
en_result_t enRet = Ok;
uint32_t u32TimeCount = 0UL;
uint32_t u32Index = 0UL;
if((au8Plaintext != NULL) && (u32CiphertextSize != 0UL) \
&& (pu8Key != NULL) && (u8KeyLength != 0U) \
&& (au8Ciphertext != NULL))
{
DDL_ASSERT(IS_AES_KEYLENGTH(u8KeyLength));
enRet = Ok;
while(u32CiphertextSize > 0UL)
{
/* Wait for AES to stop */
while(READ_REG32_BIT(M4_AES->CR, AES_CR_START) == 1U)
{
if(u32TimeCount++ > AES_TIMEOUT)
{
enRet = ErrorTimeout;
break;
}
}
if (enRet == Ok)
{
AES_WriteData(&au8Ciphertext[u32Index]);
AES_WriteKey(pu8Key, u8KeyLength);
switch (u8KeyLength)
{
case AES_KEY_LEN_128BIT:
MODIFY_REG32(M4_AES->CR, AES_CR_KEYSIZE, AES_KEY_SIZE_128BIT);
break;
case AES_KEY_LEN_192BIT:
MODIFY_REG32(M4_AES->CR, AES_CR_KEYSIZE, AES_KEY_SIZE_192BIT);
break;
case AES_KEY_LEN_256BIT:
MODIFY_REG32(M4_AES->CR, AES_CR_KEYSIZE, AES_KEY_SIZE_256BIT);
break;
default:
break;
}
/* Set AES decrypt. */
SET_REG32_BIT(M4_AES->CR, AES_CR_MODE);
/* Start AES calculating. */
SET_REG32_BIT(M4_AES->CR, AES_CR_START);
/* Wait for AES to stop */
u32TimeCount = 0UL;
while(READ_REG32_BIT(M4_AES->CR, AES_CR_START) == 1UL)
{
if(u32TimeCount++ >= AES_TIMEOUT)
{
enRet = ErrorTimeout;
break;
}
}
if (enRet == Ok)
{
AES_ReadData(&au8Plaintext[u32Index]);
u32CiphertextSize -= AES_BLOCK_LEN;
u32Index += AES_BLOCK_LEN;
}
}
}
}
return enRet;
}
/**
* @brief Write the input buffer in data register.
* @param [in] pu8Srcdata Point to the source data buffer.
* @retval None
*/
static void AES_WriteData(const uint8_t *pu8Srcdata)
{
uint8_t i;
uint32_t u32DrAddr = (uint32_t)&(M4_AES->DR0);
uint32_t u32SrcAddr = (uint32_t)pu8Srcdata;
for(i = 0U; i < 4U; i++)
{
RW_MEM32(u32DrAddr) = RW_MEM32(u32SrcAddr);
u32SrcAddr += 4UL;
u32DrAddr += 4UL;
}
}
/**
* @brief Read the from data register.
* @param [out] pu8Result Point to the result buffer.
* @retval None
*/
static void AES_ReadData(const uint8_t *pu8Result)
{
uint8_t i;
uint32_t u32DrAddr = (uint32_t)&(M4_AES->DR0);
uint32_t u32ResultAddr = (uint32_t)pu8Result;
for(i = 0U; i < 4U; i++)
{
RW_MEM32(u32ResultAddr) = RW_MEM32(u32DrAddr);
u32DrAddr += 4U;
u32ResultAddr += 4UL;
}
}
/**
* @brief Write the input buffer in key register.
* @param [in] pu8Key Pointer to the kry buffer.
* @param [in] u8KeyLength Length of key in bytes.
* @retval None
*/
static void AES_WriteKey(const uint8_t *pu8Key, uint8_t u8KeyLength)
{
uint8_t i;
uint8_t Length = 0U;
uint32_t u32KeyAddr = (uint32_t)&(M4_AES->KR0);
uint32_t u32DataAddr = (uint32_t)pu8Key;
switch (u8KeyLength)
{
case AES_KEY_LEN_128BIT:
Length = 4U;
break;
case AES_KEY_LEN_192BIT:
Length = 6U;
break;
case AES_KEY_LEN_256BIT:
Length = 8U;
break;
default:
break;
}
for(i = 0U; i < Length; i++)
{
RW_MEM32(u32KeyAddr) = RW_MEM32(u32DataAddr);
u32DataAddr += 4UL;
u32KeyAddr += 4UL;
}
}
/**
* @}
*/
#endif /* DDL_AES_ENABLE */
/**
* @}
*/
/**
* @}
*/
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
|
