📄 stm32l1xx_aes_util.c
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*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
}
}
/* Disable AES before starting new processing */
AES_Cmd(DISABLE);
return status;
}
/**
* @brief Decrypt using AES in CBC Mode
* @param InitVectors: Initialisation Vectors used for AES algorithm.
* @param Key: Key used for AES algorithm.
* @param Input: pointer to the Input buffer.
* @param Ilength: length of the Input buffer, must be a multiple of 16 bytes.
* @param Output: pointer to the returned buffer.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Operation done
* - ERROR: Operation failed
*/
ErrorStatus AES_CBC_Decrypt(uint8_t* Key, uint8_t InitVectors[16], uint8_t* Input, uint32_t Ilength, uint8_t* Output)
{
AES_InitTypeDef AES_InitStructure;
AES_KeyInitTypeDef AES_KeyInitStructure;
AES_IVInitTypeDef AES_IVInitStructure;
ErrorStatus status = SUCCESS;
uint32_t keyaddr = (uint32_t)Key;
uint32_t inputaddr = (uint32_t)Input;
uint32_t outputaddr = (uint32_t)Output;
uint32_t ivaddr = (uint32_t)InitVectors;
__IO uint32_t counter = 0;
uint32_t ccstatus = 0;
uint32_t i = 0;
/* AES Key initialisation*/
AES_KeyInitStructure.AES_Key3 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key2 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key1 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key0 = __REV(*(uint32_t*)(keyaddr));
AES_KeyInit(&AES_KeyInitStructure);
/* AES Initialization Vectors */
AES_IVInitStructure.AES_IV3 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV2 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV1 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV0 = __REV(*(uint32_t*)(ivaddr));
AES_IVInit(&AES_IVInitStructure);
/* AES configuration */
AES_InitStructure.AES_Operation = AES_Operation_KeyDerivAndDecryp;
AES_InitStructure.AES_Chaining = AES_Chaining_CBC;
AES_InitStructure.AES_DataType = AES_DataType_8b;
AES_Init(&AES_InitStructure);
/* Enable AES */
AES_Cmd(ENABLE);
for(i = 0; ((i < Ilength) && (status != ERROR)); i += 16)
{
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
/* Wait for CCF flag to be set */
counter = 0;
do
{
ccstatus = AES_GetFlagStatus(AES_FLAG_CCF);
counter++;
}while((counter != AES_CC_TIMEOUT) && (ccstatus == RESET));
if (ccstatus == RESET)
{
status = ERROR;
}
else
{
/* Clear CCF flag */
AES_ClearFlag(AES_FLAG_CCF);
/* Read cipher text */
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
}
}
/* Disable AES before starting new processing */
AES_Cmd(DISABLE);
return status;
}
/**
* @brief Encrypt using AES in CTR Mode
* @param InitVectors: Initialisation Vectors used for AES algorithm.
* @param Key: Key used for AES algorithm.
* @param Input: pointer to the Input buffer.
* @param Ilength: length of the Input buffer, must be a multiple of 16 bytes.
* @param Output: pointer to the returned buffer.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Operation done
* - ERROR: Operation failed
*/
ErrorStatus AES_CTR_Encrypt(uint8_t* Key, uint8_t InitVectors[16], uint8_t* Input, uint32_t Ilength, uint8_t* Output)
{
AES_InitTypeDef AES_InitStructure;
AES_KeyInitTypeDef AES_KeyInitStructure;
AES_IVInitTypeDef AES_IVInitStructure;
ErrorStatus status = SUCCESS;
uint32_t keyaddr = (uint32_t)Key;
uint32_t inputaddr = (uint32_t)Input;
uint32_t outputaddr = (uint32_t)Output;
uint32_t ivaddr = (uint32_t)InitVectors;
__IO uint32_t counter = 0;
uint32_t ccstatus = 0;
uint32_t i = 0;
/* AES key initialisation*/
AES_KeyInitStructure.AES_Key3 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key2 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key1 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key0 = __REV(*(uint32_t*)(keyaddr));
AES_KeyInit(&AES_KeyInitStructure);
/* AES Initialization Vectors */
AES_IVInitStructure.AES_IV3 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV2= __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV1 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV0= __REV(*(uint32_t*)(ivaddr));
AES_IVInit(&AES_IVInitStructure);
/* AES configuration */
AES_InitStructure.AES_Operation = AES_Operation_Encryp;
AES_InitStructure.AES_Chaining = AES_Chaining_CTR;
AES_InitStructure.AES_DataType = AES_DataType_8b;
AES_Init(&AES_InitStructure);
/* Enable AES */
AES_Cmd(ENABLE);
for(i = 0; ((i < Ilength) && (status != ERROR)); i += 16)
{
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
/* Wait for CCF flag to be set */
counter = 0;
do
{
ccstatus = AES_GetFlagStatus(AES_FLAG_CCF);
counter++;
}while((counter != AES_CC_TIMEOUT) && (ccstatus == RESET));
if (ccstatus == RESET)
{
status = ERROR;
}
else
{
/* Clear CCF flag */
AES_ClearFlag(AES_FLAG_CCF);
/* Read cipher text */
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
}
}
/* Disable AES before starting new processing */
AES_Cmd(DISABLE);
return status;
}
/**
* @brief Decrypt using AES in CTR Mode
* @param InitVectors: Initialisation Vectors used for AES algorithm.
* @param Key: Key used for AES algorithm.
* @param Input: pointer to the Input buffer.
* @param Ilength: length of the Input buffer, must be a multiple of 16 bytes.
* @param Output: pointer to the returned buffer.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Operation done
* - ERROR: Operation failed
*/
ErrorStatus AES_CTR_Decrypt(uint8_t* Key, uint8_t InitVectors[16], uint8_t* Input, uint32_t Ilength, uint8_t* Output)
{
AES_InitTypeDef AES_InitStructure;
AES_KeyInitTypeDef AES_KeyInitStructure;
AES_IVInitTypeDef AES_IVInitStructure;
ErrorStatus status = SUCCESS;
uint32_t keyaddr = (uint32_t)Key;
uint32_t inputaddr = (uint32_t)Input;
uint32_t outputaddr = (uint32_t)Output;
uint32_t ivaddr = (uint32_t)InitVectors;
__IO uint32_t counter = 0;
uint32_t ccstatus = 0;
uint32_t i = 0;
/* AES Key initialisation*/
AES_KeyInitStructure.AES_Key3 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key2 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key1 = __REV(*(uint32_t*)(keyaddr));
keyaddr += 4;
AES_KeyInitStructure.AES_Key0 = __REV(*(uint32_t*)(keyaddr));
AES_KeyInit(&AES_KeyInitStructure);
/* AES Initialization Vectors */
AES_IVInitStructure.AES_IV3 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV2 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV1 = __REV(*(uint32_t*)(ivaddr));
ivaddr += 4;
AES_IVInitStructure.AES_IV0 = __REV(*(uint32_t*)(ivaddr));
AES_IVInit(&AES_IVInitStructure);
/* AES configuration */
AES_InitStructure.AES_Operation = AES_Operation_KeyDerivAndDecryp;
AES_InitStructure.AES_Chaining = AES_Chaining_CTR;
AES_InitStructure.AES_DataType = AES_DataType_8b;
AES_Init(&AES_InitStructure);
/* Enable AES */
AES_Cmd(ENABLE);
for(i = 0; ((i < Ilength) && (status != ERROR)); i += 16)
{
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
AES_WriteSubData(*(uint32_t*)(inputaddr));
inputaddr += 4;
/* Wait for CCF flag to be set */
counter = 0;
do
{
ccstatus = AES_GetFlagStatus(AES_FLAG_CCF);
counter++;
}while((counter != AES_CC_TIMEOUT) && (ccstatus == RESET));
if (ccstatus == RESET)
{
status = ERROR;
}
else
{
/* Clear CCF flag */
AES_ClearFlag(AES_FLAG_CCF);
/* Read cipher text */
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
*(uint32_t*)(outputaddr) = AES_ReadSubData();
outputaddr += 4;
}
}
/* Disable AES before starting new processing */
AES_Cmd(DISABLE);
return status;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2012 STMicroelectronics *****END OF FILE****/
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