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/**
******************************************************************************
* @file stm32f4xx_hash.c
* @author MCD Application Team
* @version V1.1.0
* @date 11-January-2013
* @brief This file provides firmware functions to manage the following
* functionalities of the HASH / HMAC Processor (HASH) peripheral:
* - Initialization and Configuration functions
* - Message Digest generation functions
* - context swapping functions
* - DMA interface function
* - Interrupts and flags management
*
@verbatim
===================================================================
##### How to use this driver #####
===================================================================
*** HASH operation : ***
========================
[..]
(#) Enable the HASH controller clock using
RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_HASH, ENABLE) function.
(#) Initialise the HASH using HASH_Init() function.
(#) Reset the HASH processor core, so that the HASH will be ready
to compute he message digest of a new message by using HASH_Reset() function.
(#) Enable the HASH controller using the HASH_Cmd() function.
(#) if using DMA for Data input transfer, Activate the DMA Request
using HASH_DMACmd() function
(#) if DMA is not used for data transfer, use HASH_DataIn() function
to enter data to IN FIFO.
(#) Configure the Number of valid bits in last word of the message
using HASH_SetLastWordValidBitsNbr() function.
(#) if the message length is not an exact multiple of 512 bits,
then the function HASH_StartDigest() must be called to launch the computation
of the final digest.
(#) Once computed, the digest can be read using HASH_GetDigest() function.
(#) To control HASH events you can use one of the following wo methods:
(++) Check on HASH flags using the HASH_GetFlagStatus() function.
(++) Use HASH interrupts through the function HASH_ITConfig() at
initialization phase and HASH_GetITStatus() function into
interrupt routines in hashing phase.
After checking on a flag you should clear it using HASH_ClearFlag()
function. And after checking on an interrupt event you should
clear it using HASH_ClearITPendingBit() function.
(#) Save and restore hash processor context using
HASH_SaveContext() and HASH_RestoreContext() functions.
*** HMAC operation : ***
========================
[..] The HMAC algorithm is used for message authentication, by
irreversibly binding the message being processed to a key chosen
by the user.
For HMAC specifications, refer to "HMAC: keyed-hashing for message
authentication, H. Krawczyk, M. Bellare, R. Canetti, February 1997"
[..] Basically, the HMAC algorithm consists of two nested hash operations:
HMAC(message) = Hash[((key | pad) XOR 0x5C) | Hash(((key | pad) XOR 0x36) | message)]
where:
(+) "pad" is a sequence of zeroes needed to extend the key to the
length of the underlying hash function data block (that is
512 bits for both the SHA-1 and MD5 hash algorithms)
(+) "|" represents the concatenation operator
[..]To compute the HMAC, four different phases are required:
(#) Initialise the HASH using HASH_Init() function to do HMAC
operation.
(#) The key (to be used for the inner hash function) is then given to the core.
This operation follows the same mechanism as the one used to send the
message in the hash operation (that is, by HASH_DataIn() function and,
finally, HASH_StartDigest() function.
(#) Once the last word has been entered and computation has started,
the hash processor elaborates the key. It is then ready to accept the message
text using the same mechanism as the one used to send the message in the
hash operation.
(#) After the first hash round, the hash processor returns "ready" to indicate
that it is ready to receive the key to be used for the outer hash function
(normally, this key is the same as the one used for the inner hash function).
When the last word of the key is entered and computation starts, the HMAC
result is made available using HASH_GetDigest() function.
@endverbatim
*
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT 2013 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_hash.h"
#include "stm32f4xx_rcc.h"
/** @addtogroup STM32F4xx_StdPeriph_Driver
* @{
*/
/** @defgroup HASH
* @brief HASH driver modules
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup HASH_Private_Functions
* @{
*/
/** @defgroup HASH_Group1 Initialization and Configuration functions
* @brief Initialization and Configuration functions
*
@verbatim
===============================================================================
##### Initialization and Configuration functions #####
===============================================================================
[..] This section provides functions allowing to
(+) Initialize the HASH peripheral
(+) Configure the HASH Processor
(+) MD5/SHA1,
(+) HASH/HMAC,
(+) datatype
(+) HMAC Key (if mode = HMAC)
(+) Reset the HASH Processor
@endverbatim
* @{
*/
/**
* @brief De-initializes the HASH peripheral registers to their default reset values
* @param None
* @retval None
*/
void HASH_DeInit(void)
{
/* Enable HASH reset state */
RCC_AHB2PeriphResetCmd(RCC_AHB2Periph_HASH, ENABLE);
/* Release HASH from reset state */
RCC_AHB2PeriphResetCmd(RCC_AHB2Periph_HASH, DISABLE);
}
/**
* @brief Initializes the HASH peripheral according to the specified parameters
* in the HASH_InitStruct structure.
* @note the hash processor is reset when calling this function so that the
* HASH will be ready to compute the message digest of a new message.
* There is no need to call HASH_Reset() function.
* @param HASH_InitStruct: pointer to a HASH_InitTypeDef structure that contains
* the configuration information for the HASH peripheral.
* @note The field HASH_HMACKeyType in HASH_InitTypeDef must be filled only
* if the algorithm mode is HMAC.
* @retval None
*/
void HASH_Init(HASH_InitTypeDef* HASH_InitStruct)
{
/* Check the parameters */
assert_param(IS_HASH_ALGOSELECTION(HASH_InitStruct->HASH_AlgoSelection));
assert_param(IS_HASH_DATATYPE(HASH_InitStruct->HASH_DataType));
assert_param(IS_HASH_ALGOMODE(HASH_InitStruct->HASH_AlgoMode));
/* Configure the Algorithm used, algorithm mode and the datatype */
HASH->CR &= ~ (HASH_CR_ALGO | HASH_CR_DATATYPE | HASH_CR_MODE);
HASH->CR |= (HASH_InitStruct->HASH_AlgoSelection | \
HASH_InitStruct->HASH_DataType | \
HASH_InitStruct->HASH_AlgoMode);
/* if algorithm mode is HMAC, set the Key */
if(HASH_InitStruct->HASH_AlgoMode == HASH_AlgoMode_HMAC)
{
assert_param(IS_HASH_HMAC_KEYTYPE(HASH_InitStruct->HASH_HMACKeyType));
HASH->CR &= ~HASH_CR_LKEY;
HASH->CR |= HASH_InitStruct->HASH_HMACKeyType;
}
/* Reset the HASH processor core, so that the HASH will be ready to compute
the message digest of a new message */
HASH->CR |= HASH_CR_INIT;
}
/**
* @brief Fills each HASH_InitStruct member with its default value.
* @param HASH_InitStruct : pointer to a HASH_InitTypeDef structure which will
* be initialized.
* @note The default values set are : Processor mode is HASH, Algorithm selected is SHA1,
* Data type selected is 32b and HMAC Key Type is short key.
* @retval None
*/
void HASH_StructInit(HASH_InitTypeDef* HASH_InitStruct)
{
/* Initialize the HASH_AlgoSelection member */
HASH_InitStruct->HASH_AlgoSelection = HASH_AlgoSelection_SHA1;
/* Initialize the HASH_AlgoMode member */
HASH_InitStruct->HASH_AlgoMode = HASH_AlgoMode_HASH;
/* Initialize the HASH_DataType member */
HASH_InitStruct->HASH_DataType = HASH_DataType_32b;
/* Initialize the HASH_HMACKeyType member */
HASH_InitStruct->HASH_HMACKeyType = HASH_HMACKeyType_ShortKey;
}
/**
* @brief Resets the HASH processor core, so that the HASH will be ready
* to compute the message digest of a new message.
* @note Calling this function will clear the HASH_SR_DCIS (Digest calculation
* completion interrupt status) bit corresponding to HASH_IT_DCI
* interrupt and HASH_FLAG_DCIS flag.
* @param None
* @retval None
*/
void HASH_Reset(void)
{
/* Reset the HASH processor core */
HASH->CR |= HASH_CR_INIT;
}
/**
* @}
*/
/** @defgroup HASH_Group2 Message Digest generation functions
* @brief Message Digest generation functions
*
@verbatim
===============================================================================
##### Message Digest generation functions #####
===============================================================================
[..] This section provides functions allowing the generation of message digest:
(+) Push data in the IN FIFO : using HASH_DataIn()
(+) Get the number of words set in IN FIFO, use HASH_GetInFIFOWordsNbr()
(+) set the last word valid bits number using HASH_SetLastWordValidBitsNbr()
(+) start digest calculation : using HASH_StartDigest()
(+) Get the Digest message : using HASH_GetDigest()
@endverbatim
* @{
*/
/**
* @brief Configure the Number of valid bits in last word of the message
* @param ValidNumber: Number of valid bits in last word of the message.
* This parameter must be a number between 0 and 0x1F.
* - 0x00: All 32 bits of the last data written are valid
* - 0x01: Only bit [0] of the last data written is valid
* - 0x02: Only bits[1:0] of the last data written are valid
* - 0x03: Only bits[2:0] of the last data written are valid
* - ...
* - 0x1F: Only bits[30:0] of the last data written are valid
* @note The Number of valid bits must be set before to start the message
* digest competition (in Hash and HMAC) and key treatment(in HMAC).
* @retval None
*/
void HASH_SetLastWordValidBitsNbr(uint16_t ValidNumber)
{
/* Check the parameters */
assert_param(IS_HASH_VALIDBITSNUMBER(ValidNumber));
/* Configure the Number of valid bits in last word of the message */
HASH->STR &= ~(HASH_STR_NBW);
HASH->STR |= ValidNumber;
}
/**
* @brief Writes data in the Data Input FIFO
* @param Data: new data of the message to be processed.
* @retval None
*/
void HASH_DataIn(uint32_t Data)
{
/* Write in the DIN register a new data */
HASH->DIN = Data;
}
/**
* @brief Returns the number of words already pushed into the IN FIFO.
* @param None
* @retval The value of words already pushed into the IN FIFO.
*/
uint8_t HASH_GetInFIFOWordsNbr(void)
{
/* Return the value of NBW bits */
return ((HASH->CR & HASH_CR_NBW) >> 8);
}
/**
* @brief Provides the message digest result.
* @note In MD5 mode, Data[7] to Data[4] filed of HASH_MsgDigest structure is not used
* and is read as zero.
* In SHA-1 mode, Data[7] to Data[5] filed of HASH_MsgDigest structure is not used
* and is read as zero.
* In SHA-224 mode, Data[7] filed of HASH_MsgDigest structure is not used
* and is read as zero.
* @param HASH_MessageDigest: pointer to a HASH_MsgDigest structure which will
* hold the message digest result
* @retval None
*/
void HASH_GetDigest(HASH_MsgDigest* HASH_MessageDigest)
{
/* Get the data field */
HASH_MessageDigest->Data[0] = HASH->HR[0];
HASH_MessageDigest->Data[1] = HASH->HR[1];
HASH_MessageDigest->Data[2] = HASH->HR[2];
HASH_MessageDigest->Data[3] = HASH->HR[3];
HASH_MessageDigest->Data[4] = HASH->HR[4];
HASH_MessageDigest->Data[5] = HASH_DIGEST->HR[5];
HASH_MessageDigest->Data[6] = HASH_DIGEST->HR[6];
HASH_MessageDigest->Data[7] = HASH_DIGEST->HR[7];
}
/**
* @brief Starts the message padding and calculation of the final message
* @param None
* @retval None
*/
void HASH_StartDigest(void)
{
/* Start the Digest calculation */
HASH->STR |= HASH_STR_DCAL;
}
/**
* @}
*/
/** @defgroup HASH_Group3 Context swapping functions
* @brief Context swapping functions
*
@verbatim
===============================================================================
##### Context swapping functions #####
===============================================================================
[..] This section provides functions allowing to save and store HASH Context
[..] It is possible to interrupt a HASH/HMAC process to perform another processing
with a higher priority, and to complete the interrupted process later on, when
the higher priority task is complete. To do so, the context of the interrupted
task must be saved from the HASH registers to memory, and then be restored
from memory to the HASH registers.
(#) To save the current context, use HASH_SaveContext() function
(#) To restore the saved context, use HASH_RestoreContext() function
@endverbatim
* @{
*/
/**
* @brief Save the Hash peripheral Context.
* @note The context can be saved only when no block is currently being
* processed. So user must wait for DINIS = 1 (the last block has been
* processed and the input FIFO is empty) or NBW != 0 (the FIFO is not
* full and no processing is ongoing).
* @param HASH_ContextSave: pointer to a HASH_Context structure that contains
* the repository for current context.
* @retval None
*/
void HASH_SaveContext(HASH_Context* HASH_ContextSave)
{
uint8_t i = 0;
/* save context registers */
HASH_ContextSave->HASH_IMR = HASH->IMR;
HASH_ContextSave->HASH_STR = HASH->STR;
HASH_ContextSave->HASH_CR = HASH->CR;
for(i=0; i<=53;i++)
{
HASH_ContextSave->HASH_CSR[i] = HASH->CSR[i];
}
}
/**
* @brief Restore the Hash peripheral Context.
* @note After calling this function, user can restart the processing from the
* point where it has been interrupted.
* @param HASH_ContextRestore: pointer to a HASH_Context structure that contains
* the repository for saved context.
* @retval None
*/
void HASH_RestoreContext(HASH_Context* HASH_ContextRestore)
{
uint8_t i = 0;
/* restore context registers */
HASH->IMR = HASH_ContextRestore->HASH_IMR;
HASH->STR = HASH_ContextRestore->HASH_STR;
HASH->CR = HASH_ContextRestore->HASH_CR;
/* Initialize the hash processor */
HASH->CR |= HASH_CR_INIT;
/* continue restoring context registers */
for(i=0; i<=53;i++)
{
HASH->CSR[i] = HASH_ContextRestore->HASH_CSR[i];
}
}
/**
* @}
*/
/** @defgroup HASH_Group4 HASH's DMA interface Configuration function
* @brief HASH's DMA interface Configuration function
*
@verbatim
===============================================================================
##### HASH's DMA interface Configuration function #####
===============================================================================
[..] This section provides functions allowing to configure the DMA interface for
HASH/ HMAC data input transfer.
[..] When the DMA mode is enabled (using the HASH_DMACmd() function), data can be
sent to the IN FIFO using the DMA peripheral.
@endverbatim
* @{
*/
/**
* @brief Enables or disables auto-start message padding and
* calculation of the final message digest at the end of DMA transfer.
* @param NewState: new state of the selected HASH DMA transfer request.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void HASH_AutoStartDigest(FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the auto start of the final message digest at the end of DMA transfer */
HASH->CR &= ~HASH_CR_MDMAT;
}
else
{
/* Disable the auto start of the final message digest at the end of DMA transfer */
HASH->CR |= HASH_CR_MDMAT;
}
}
/**
* @brief Enables or disables the HASH DMA interface.
* @note The DMA is disabled by hardware after the end of transfer.
* @param NewState: new state of the selected HASH DMA transfer request.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void HASH_DMACmd(FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the HASH DMA request */
HASH->CR |= HASH_CR_DMAE;
}
else
{
/* Disable the HASH DMA request */
HASH->CR &= ~HASH_CR_DMAE;
}
}
/**
* @}
*/
/** @defgroup HASH_Group5 Interrupts and flags management functions
* @brief Interrupts and flags management functions
*
@verbatim
===============================================================================
##### Interrupts and flags management functions #####
===============================================================================
[..] This section provides functions allowing to configure the HASH Interrupts and
to get the status and clear flags and Interrupts pending bits.
[..] The HASH provides 2 Interrupts sources and 5 Flags:
*** Flags : ***
===============
[..]
(#) HASH_FLAG_DINIS : set when 16 locations are free in the Data IN FIFO
which means that a new block (512 bit) can be entered into the input buffer.
(#) HASH_FLAG_DCIS : set when Digest calculation is complete
(#) HASH_FLAG_DMAS : set when HASH's DMA interface is enabled (DMAE=1) or
a transfer is ongoing. This Flag is cleared only by hardware.
(#) HASH_FLAG_BUSY : set when The hash core is processing a block of data
This Flag is cleared only by hardware.
(#) HASH_FLAG_DINNE : set when Data IN FIFO is not empty which means that
the Data IN FIFO contains at least one word of data. This Flag is cleared
only by hardware.
*** Interrupts : ***
====================
[..]
(#) HASH_IT_DINI : if enabled, this interrupt source is pending when 16
locations are free in the Data IN FIFO which means that a new block (512 bit)
can be entered into the input buffer. This interrupt source is cleared using
HASH_ClearITPendingBit(HASH_IT_DINI) function.
(#) HASH_IT_DCI : if enabled, this interrupt source is pending when Digest
calculation is complete. This interrupt source is cleared using
HASH_ClearITPendingBit(HASH_IT_DCI) function.
*** Managing the HASH controller events : ***
=============================================
[..] The user should identify which mode will be used in his application to manage
the HASH controller events: Polling mode or Interrupt mode.
(#) In the Polling Mode it is advised to use the following functions:
(++) HASH_GetFlagStatus() : to check if flags events occur.
(++) HASH_ClearFlag() : to clear the flags events.
(#) In the Interrupt Mode it is advised to use the following functions:
(++) HASH_ITConfig() : to enable or disable the interrupt source.
(++) HASH_GetITStatus() : to check if Interrupt occurs.
(++) HASH_ClearITPendingBit() : to clear the Interrupt pending Bit
(corresponding Flag).
@endverbatim
* @{
*/
/**
* @brief Enables or disables the specified HASH interrupts.
* @param HASH_IT: specifies the HASH interrupt source to be enabled or disabled.
* This parameter can be any combination of the following values:
* @arg HASH_IT_DINI: Data Input interrupt
* @arg HASH_IT_DCI: Digest Calculation Completion Interrupt
* @param NewState: new state of the specified HASH interrupt.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void HASH_ITConfig(uint32_t HASH_IT, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_HASH_IT(HASH_IT));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected HASH interrupt */
HASH->IMR |= HASH_IT;
}
else
{
/* Disable the selected HASH interrupt */
HASH->IMR &= (uint32_t)(~HASH_IT);
}
}
/**
* @brief Checks whether the specified HASH flag is set or not.
* @param HASH_FLAG: specifies the HASH flag to check.
* This parameter can be one of the following values:
* @arg HASH_FLAG_DINIS: Data input interrupt status flag
* @arg HASH_FLAG_DCIS: Digest calculation completion interrupt status flag
* @arg HASH_FLAG_BUSY: Busy flag
* @arg HASH_FLAG_DMAS: DMAS Status flag
* @arg HASH_FLAG_DINNE: Data Input register (DIN) not empty status flag
* @retval The new state of HASH_FLAG (SET or RESET)
*/
FlagStatus HASH_GetFlagStatus(uint32_t HASH_FLAG)
{
FlagStatus bitstatus = RESET;
uint32_t tempreg = 0;
/* Check the parameters */
assert_param(IS_HASH_GET_FLAG(HASH_FLAG));
/* check if the FLAG is in CR register */
if ((HASH_FLAG & HASH_FLAG_DINNE) != (uint32_t)RESET )
{
tempreg = HASH->CR;
}
else /* The FLAG is in SR register */
{
tempreg = HASH->SR;
}
/* Check the status of the specified HASH flag */
if ((tempreg & HASH_FLAG) != (uint32_t)RESET)
{
/* HASH is set */
bitstatus = SET;
}
else
{
/* HASH_FLAG is reset */
bitstatus = RESET;
}
/* Return the HASH_FLAG status */
return bitstatus;
}
/**
* @brief Clears the HASH flags.
* @param HASH_FLAG: specifies the flag to clear.
* This parameter can be any combination of the following values:
* @arg HASH_FLAG_DINIS: Data Input Flag
* @arg HASH_FLAG_DCIS: Digest Calculation Completion Flag
* @retval None
*/
void HASH_ClearFlag(uint32_t HASH_FLAG)
{
/* Check the parameters */
assert_param(IS_HASH_CLEAR_FLAG(HASH_FLAG));
/* Clear the selected HASH flags */
HASH->SR = ~(uint32_t)HASH_FLAG;
}
/**
* @brief Checks whether the specified HASH interrupt has occurred or not.
* @param HASH_IT: specifies the HASH interrupt source to check.
* This parameter can be one of the following values:
* @arg HASH_IT_DINI: Data Input interrupt
* @arg HASH_IT_DCI: Digest Calculation Completion Interrupt
* @retval The new state of HASH_IT (SET or RESET).
*/
ITStatus HASH_GetITStatus(uint32_t HASH_IT)
{
ITStatus bitstatus = RESET;
uint32_t tmpreg = 0;
/* Check the parameters */
assert_param(IS_HASH_GET_IT(HASH_IT));
/* Check the status of the specified HASH interrupt */
tmpreg = HASH->SR;
if (((HASH->IMR & tmpreg) & HASH_IT) != RESET)
{
/* HASH_IT is set */
bitstatus = SET;
}
else
{
/* HASH_IT is reset */
bitstatus = RESET;
}
/* Return the HASH_IT status */
return bitstatus;
}
/**
* @brief Clears the HASH interrupt pending bit(s).
* @param HASH_IT: specifies the HASH interrupt pending bit(s) to clear.
* This parameter can be any combination of the following values:
* @arg HASH_IT_DINI: Data Input interrupt
* @arg HASH_IT_DCI: Digest Calculation Completion Interrupt
* @retval None
*/
void HASH_ClearITPendingBit(uint32_t HASH_IT)
{
/* Check the parameters */
assert_param(IS_HASH_IT(HASH_IT));
/* Clear the selected HASH interrupt pending bit */
HASH->SR = (uint32_t)(~HASH_IT);
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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