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stm32f4xx_cryp_des.c
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stm32f4xx_cryp_des.c
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/**
******************************************************************************
* @file stm32f4xx_cryp_des.c
* @author MCD Application Team
* @version V1.8.0
* @date 04-November-2016
* @brief This file provides high level functions to encrypt and decrypt an
* input message using DES in ECB/CBC modes.
* It uses the stm32f4xx_cryp.c/.h drivers to access the STM32F4xx CRYP
* peripheral.
*
@verbatim
===================================================================
##### How to use this driver #####
===================================================================
[..]
(#) Enable The CRYP controller clock using
RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_CRYP, ENABLE); function.
(#) Encrypt and decrypt using DES in ECB Mode using CRYP_DES_ECB() function.
(#) Encrypt and decrypt using DES in CBC Mode using CRYP_DES_CBC() function.
@endverbatim
*
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT 2016 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_cryp.h"
/** @addtogroup STM32F4xx_StdPeriph_Driver
* @{
*/
/** @defgroup CRYP
* @brief CRYP driver modules
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define DESBUSY_TIMEOUT ((uint32_t) 0x00010000)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup CRYP_Private_Functions
* @{
*/
/** @defgroup CRYP_Group8 High Level DES functions
* @brief High Level DES functions
*
@verbatim
===============================================================================
##### High Level DES functions #####
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Encrypt and decrypt using DES in ECB Mode
* @param Mode: encryption or decryption Mode.
* This parameter can be one of the following values:
* @arg MODE_ENCRYPT: Encryption
* @arg MODE_DECRYPT: Decryption
* @param Key: Key used for DES algorithm.
* @param Ilength: length of the Input buffer, must be a multiple of 8.
* @param Input: pointer to the Input buffer.
* @param Output: pointer to the returned buffer.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Operation done
* - ERROR: Operation failed
*/
ErrorStatus CRYP_DES_ECB(uint8_t Mode, uint8_t Key[8], uint8_t *Input,
uint32_t Ilength, uint8_t *Output)
{
CRYP_InitTypeDef DES_CRYP_InitStructure;
CRYP_KeyInitTypeDef DES_CRYP_KeyInitStructure;
__IO uint32_t counter = 0;
uint32_t busystatus = 0;
ErrorStatus status = SUCCESS;
uint32_t keyaddr = (uint32_t)Key;
uint32_t inputaddr = (uint32_t)Input;
uint32_t outputaddr = (uint32_t)Output;
uint32_t i = 0;
/* Crypto structures initialisation*/
CRYP_KeyStructInit(&DES_CRYP_KeyInitStructure);
/* Crypto Init for Encryption process */
if( Mode == MODE_ENCRYPT ) /* DES encryption */
{
DES_CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Encrypt;
}
else/* if( Mode == MODE_DECRYPT )*/ /* DES decryption */
{
DES_CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Decrypt;
}
DES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_DES_ECB;
DES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;
CRYP_Init(&DES_CRYP_InitStructure);
/* Key Initialisation */
DES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
keyaddr+=4;
DES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
CRYP_KeyInit(& DES_CRYP_KeyInitStructure);
/* Flush IN/OUT FIFO */
CRYP_FIFOFlush();
/* Enable Crypto processor */
CRYP_Cmd(ENABLE);
if(CRYP_GetCmdStatus() == DISABLE)
{
/* The CRYP peripheral clock is not enabled or the device doesn't embed
the CRYP peripheral (please check the device sales type. */
status = ERROR;
}
else
{
for(i=0; ((i<Ilength) && (status != ERROR)); i+=8)
{
/* Write the Input block in the Input FIFO */
CRYP_DataIn(*(uint32_t*)(inputaddr));
inputaddr+=4;
CRYP_DataIn(*(uint32_t*)(inputaddr));
inputaddr+=4;
/* Wait until the complete message has been processed */
counter = 0;
do
{
busystatus = CRYP_GetFlagStatus(CRYP_FLAG_BUSY);
counter++;
}while ((counter != DESBUSY_TIMEOUT) && (busystatus != RESET));
if (busystatus != RESET)
{
status = ERROR;
}
else
{
/* Read the Output block from the Output FIFO */
*(uint32_t*)(outputaddr) = CRYP_DataOut();
outputaddr+=4;
*(uint32_t*)(outputaddr) = CRYP_DataOut();
outputaddr+=4;
}
}
/* Disable Crypto */
CRYP_Cmd(DISABLE);
}
return status;
}
/**
* @brief Encrypt and decrypt using DES in CBC Mode
* @param Mode: encryption or decryption Mode.
* This parameter can be one of the following values:
* @arg MODE_ENCRYPT: Encryption
* @arg MODE_DECRYPT: Decryption
* @param Key: Key used for DES algorithm.
* @param InitVectors: Initialisation Vectors used for DES algorithm.
* @param Ilength: length of the Input buffer, must be a multiple of 8.
* @param Input: pointer to the Input buffer.
* @param Output: pointer to the returned buffer.
* @retval An ErrorStatus enumeration value:
* - SUCCESS: Operation done
* - ERROR: Operation failed
*/
ErrorStatus CRYP_DES_CBC(uint8_t Mode, uint8_t Key[8], uint8_t InitVectors[8],
uint8_t *Input, uint32_t Ilength, uint8_t *Output)
{
CRYP_InitTypeDef DES_CRYP_InitStructure;
CRYP_KeyInitTypeDef DES_CRYP_KeyInitStructure;
CRYP_IVInitTypeDef DES_CRYP_IVInitStructure;
__IO uint32_t counter = 0;
uint32_t busystatus = 0;
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;
uint32_t i = 0;
/* Crypto structures initialisation*/
CRYP_KeyStructInit(&DES_CRYP_KeyInitStructure);
/* Crypto Init for Encryption process */
if(Mode == MODE_ENCRYPT) /* DES encryption */
{
DES_CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Encrypt;
}
else /*if(Mode == MODE_DECRYPT)*/ /* DES decryption */
{
DES_CRYP_InitStructure.CRYP_AlgoDir = CRYP_AlgoDir_Decrypt;
}
DES_CRYP_InitStructure.CRYP_AlgoMode = CRYP_AlgoMode_DES_CBC;
DES_CRYP_InitStructure.CRYP_DataType = CRYP_DataType_8b;
CRYP_Init(&DES_CRYP_InitStructure);
/* Key Initialisation */
DES_CRYP_KeyInitStructure.CRYP_Key1Left = __REV(*(uint32_t*)(keyaddr));
keyaddr+=4;
DES_CRYP_KeyInitStructure.CRYP_Key1Right= __REV(*(uint32_t*)(keyaddr));
CRYP_KeyInit(& DES_CRYP_KeyInitStructure);
/* Initialization Vectors */
DES_CRYP_IVInitStructure.CRYP_IV0Left = __REV(*(uint32_t*)(ivaddr));
ivaddr+=4;
DES_CRYP_IVInitStructure.CRYP_IV0Right= __REV(*(uint32_t*)(ivaddr));
CRYP_IVInit(&DES_CRYP_IVInitStructure);
/* Flush IN/OUT FIFO */
CRYP_FIFOFlush();
/* Enable Crypto processor */
CRYP_Cmd(ENABLE);
if(CRYP_GetCmdStatus() == DISABLE)
{
/* The CRYP peripheral clock is not enabled or the device doesn't embed
the CRYP peripheral (please check the device sales type. */
status = ERROR;
}
else
{
for(i=0; ((i<Ilength) && (status != ERROR)); i+=8)
{
/* Write the Input block in the Input FIFO */
CRYP_DataIn(*(uint32_t*)(inputaddr));
inputaddr+=4;
CRYP_DataIn(*(uint32_t*)(inputaddr));
inputaddr+=4;
/* Wait until the complete message has been processed */
counter = 0;
do
{
busystatus = CRYP_GetFlagStatus(CRYP_FLAG_BUSY);
counter++;
}while ((counter != DESBUSY_TIMEOUT) && (busystatus != RESET));
if (busystatus != RESET)
{
status = ERROR;
}
else
{
/* Read the Output block from the Output FIFO */
*(uint32_t*)(outputaddr) = CRYP_DataOut();
outputaddr+=4;
*(uint32_t*)(outputaddr) = CRYP_DataOut();
outputaddr+=4;
}
}
/* Disable Crypto */
CRYP_Cmd(DISABLE);
}
return status;
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

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