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/*!
* @file apm32f4xx_cryp_des.c
*
* @brief This file provides high level functions to encrypt and decrypt,
* Input message using DES in ECB/CBC modes.
*
* @version V1.0.2
*
* @date 2022-06-23
*
* @attention
*
* Copyright (C) 2021-2022 Geehy Semiconductor
*
* You may not use this file except in compliance with the
* GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
*
* The program is only for reference, which is distributed in the hope
* that it will be usefull and instructional for customers to develop
* their software. Unless required by applicable law or agreed to in
* writing, the program is distributed on an "AS IS" BASIS, WITHOUT
* ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
* See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
* and limitations under the License.
*/
#include "apm32f4xx_cryp.h"
/** @addtogroup APM32F4xx_StdPeriphDriver
@{
*/
/** @defgroup CRYP_DES_Driver
* @brief CRYP DES driver modules
@{
*/
/** @defgroup CRYP_DES_Functions
@{
*/
/*!
* @brief Encrypt and decrypt using DES in EBC Mode
*
* @param mode: Pointer to a CRYP_MODE_T structure.
* This parameter can be one of the following values:
* @arg CRYP_MODE_DECRYPT: Encryption
* @arg CRYP_MODE_ENCRYPT: Decryption
*
* @param key: Key used for DES algorithm.
* @param input: Input buffer.
* @param length: length of the Input buffer, must be a multiple of 8.
* @param output: Output buffer.
*
* @retval SUCCESS or ERROR
*/
uint8_t CRYP_DES_ECB(CRYP_MODE_T mode, uint8_t key[8], uint8_t *input,
uint32_t length, uint8_t *output)
{
CRYP_Config_T DEC_crypConfig;
CRYP_KeyConfig_T DEC_keyConfig;
uint32_t keyAddr = (uint32_t)key;
uint32_t inputAddr = (uint32_t)input;
uint32_t outputAddr = (uint32_t)output;
uint32_t i = 0;
uint32_t flag = 0;
uint32_t status = SUCCESS;
__IO uint32_t counter = 0;
CRYP_ConfigKeyStructInit(&DEC_keyConfig);
if (mode == CRYP_MODE_ENCRYPT)
{
DEC_crypConfig.algoDir = CRYP_ALGODIR_ENCRYPT;
}
else
{
DEC_crypConfig.algoDir = CRYP_ALGODIR_DECRYPT;
}
DEC_crypConfig.algoMode = CRYP_ALGOMODE_DES_ECB;
DEC_crypConfig.dataType = CRYP_DATATYPE_8B;
CRYP_Config(&DEC_crypConfig);
DEC_keyConfig.key1Left = __REV(*(uint32_t *)(keyAddr));
keyAddr += 0x04;
DEC_keyConfig.key1Right = __REV(*(uint32_t *)(keyAddr));
CRYP_ConfigKey(&DEC_keyConfig);
CRYP_FlushFIFO();
CRYP_Enable();
if (CRYP_ReadCmdStatus() == DISABLE)
{
status = ERROR;
}
else
{
for (i = 0; i < length; i += 8)
{
CRYP_InData(*(uint32_t *)(inputAddr));
inputAddr += 0x04;
CRYP_InData(*(uint32_t *)(inputAddr));
inputAddr += 0x04;
counter = 0;
do
{
flag = CRYP_ReadStatusFlag(CRYP_FLAG_BUSY);
counter++;
}
while ((counter != 0x00010000) && (flag != RESET));
if (flag == SET)
{
status = ERROR;
}
else
{
*(uint32_t *)(outputAddr) = CRYP_OutData();
outputAddr += 0x04;
*(uint32_t *)(outputAddr) = CRYP_OutData();
outputAddr += 0x04;
}
}
CRYP_Disable();
}
return status;
}
/*!
* @brief Encrypt and decrypt using DES in CBC Mode
*
* @param mode: Pointer to a CRYP_MODE_T structure.
* This parameter can be one of the following values:
* @arg CRYP_MODE_DECRYPT: Encryption
* @arg CRYP_MODE_ENCRYPT: Decryption
*
* @param key: Key used for DES algorithm.
* @param input: Input buffer.
* @param IV: Initialisation Vectors used for DES algorithm.
* @param length: length of the Input buffer, must be a multiple of 8.
* @param output: Output buffer.
*
* @retval None
*/
uint8_t CRYP_DES_CBC(CRYP_MODE_T mode, uint8_t key[8], uint8_t *input,
uint8_t IV[8], uint32_t length, uint8_t *output)
{
CRYP_Config_T DEC_crypConfig;
CRYP_KeyConfig_T DEC_keyConfig;
CRYP_IVConfig_T DEC_IVConfig;
uint32_t keyAddr = (uint32_t)key;
uint32_t inputAddr = (uint32_t)input;
uint32_t outputAddr = (uint32_t)output;
uint32_t IVAddr = (uint32_t)IV;
uint32_t i = 0;
uint32_t flag = 0;
uint32_t status = SUCCESS;
__IO uint32_t counter = 0;
CRYP_ConfigKeyStructInit(&DEC_keyConfig);
if (mode == CRYP_MODE_ENCRYPT)
{
DEC_crypConfig.algoDir = CRYP_ALGODIR_ENCRYPT;
}
else
{
DEC_crypConfig.algoDir = CRYP_ALGODIR_DECRYPT;
}
DEC_crypConfig.algoMode = CRYP_ALGOMODE_DES_CBC;
DEC_crypConfig.dataType = CRYP_DATATYPE_8B;
CRYP_Config(&DEC_crypConfig);
DEC_keyConfig.key1Left = __REV(*(uint32_t *)(keyAddr));
keyAddr += 0x04;
DEC_keyConfig.key1Right = __REV(*(uint32_t *)(keyAddr));
CRYP_ConfigKey(&DEC_keyConfig);
DEC_IVConfig.IV0Left = __REV(*(uint32_t *)(IVAddr));
keyAddr += 0x04;
DEC_IVConfig.IV0Right = __REV(*(uint32_t *)(IVAddr));
CRYP_ConfigIV(&DEC_IVConfig);
CRYP_FlushFIFO();
CRYP_Enable();
if (CRYP_ReadCmdStatus() == DISABLE)
{
status = ERROR;
}
else
{
for (i = 0; i < length; i += 8)
{
CRYP_InData(*(uint32_t *)(inputAddr));
inputAddr += 0x04;
CRYP_InData(*(uint32_t *)(inputAddr));
inputAddr += 0x04;
counter = 0;
do
{
flag = CRYP_ReadStatusFlag(CRYP_FLAG_BUSY);
counter++;
}
while ((counter != 0x00010000) && (flag != RESET));
if (flag == SET)
{
status = ERROR;
}
else
{
*(uint32_t *)(outputAddr) = CRYP_OutData();
outputAddr += 0x04;
*(uint32_t *)(outputAddr) = CRYP_OutData();
outputAddr += 0x04;
}
}
CRYP_Disable();
}
return status;
}
/**@} end of group CRYP_DES_Functions */
/**@} end of group CRYP_DES_Driver */
/**@} end of group APM32F4xx_StdPeriphDriver */
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