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reference/driverlib/shamd5.c
Thomas Klaehn 2461dbfb92 Initial commit
2019-10-09 13:45:38 +02:00

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//*****************************************************************************
//
// shamd5.c
//
// Driver for the SHA/MD5 module.
//
// Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
//
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the
// distribution.
//
// Neither the name of Texas Instruments Incorporated nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//*****************************************************************************
//*****************************************************************************
//
//! \addtogroup SHA_Secure_Hash_Algorithm_api
//! @{
//
//*****************************************************************************
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_dthe.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_nvic.h"
#include "inc/hw_shamd5.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/interrupt.h"
#include "driverlib/shamd5.h"
#define SHAMD5_MODE_ALGO_MD5 0x00000000 // MD5
#define SHAMD5_MODE_ALGO_SHA1 0x00000002 // SHA-1
#define SHAMD5_MODE_ALGO_SHA224 0x00000004 // SHA-224
#define SHAMD5_MODE_ALGO_SHA256 0x00000006 // SHA-256
//*****************************************************************************
//
//! Enables the uDMA requests in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//!
//! This function configures the DMA options of the SHA/MD5 module.
//!
//! \return None
//
//*****************************************************************************
void
SHAMD5DMAEnable(uint32_t ui32Base)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Write the new configuration into the register.
//
HWREG(ui32Base + SHAMD5_O_SYSCONFIG) |=
SHAMD5_SYSCONFIG_PADVANCED | SHAMD5_SYSCONFIG_PDMA_EN;
}
//*****************************************************************************
//
//! Disables the uDMA requests in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//!
//! This function configures the DMA options of the SHA/MD5 module.
//!
//! \return None
//
//*****************************************************************************
void
SHAMD5DMADisable(uint32_t ui32Base)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Write the new configuration into the register.
//
HWREG(ui32Base + SHAMD5_O_SYSCONFIG) &=
~(SHAMD5_SYSCONFIG_PADVANCED | SHAMD5_SYSCONFIG_PDMA_EN);
}
//*****************************************************************************
//
//! Get the interrupt status of the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param bMasked is \b false if the raw interrupt status is required and
//! \b true if the masked interrupt status is required.
//!
//! This function returns the current value of the IRQSTATUS register. The
//! value will be a logical OR of the following:
//!
//! - \b SHAMD5_INT_CONTEXT_READY - Context input registers are ready.
//! - \b SHAMD5_INT_PARTHASH_READY - Context output registers are ready after
//! a context switch.
//! - \b SHAMD5_INT_INPUT_READY - Data FIFO is ready to receive data.
//! - \b SHAMD5_INT_OUTPUT_READY - Context output registers are ready.
//!
//! \return Interrupt status
//
//*****************************************************************************
uint32_t
SHAMD5IntStatus(uint32_t ui32Base, bool bMasked)
{
uint32_t ui32Temp;
uint32_t ui32IrqEnable;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Return the value of the IRQSTATUS register.
//
if(bMasked)
{
ui32Temp = HWREG(DTHE_BASE + DTHE_O_SHA_MIS);
ui32IrqEnable = HWREG(ui32Base + SHAMD5_O_IRQENABLE);
return((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) &
ui32IrqEnable) | (ui32Temp & 0x00000007) << 16);
}
else
{
ui32Temp = HWREG(DTHE_BASE + DTHE_O_SHA_RIS);
return(HWREG(ui32Base + SHAMD5_O_IRQSTATUS) |
(ui32Temp & 0x00000007) << 16);
}
}
//*****************************************************************************
//
//! Enable interrupt sources in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param ui32IntFlags contains desired interrupts to enable.
//!
//! This function enables interrupt sources in the SHA/MD5 module.
//! ui32IntFlags must be a logical OR of one or more of the following
//! values:
//!
//! - \b SHAMD5_INT_CONTEXT_READY - Context input registers are ready.
//! - \b SHAMD5_INT_PARTHASH_READY - Context output registers are ready after
//! a context switch.
//! - \b SHAMD5_INT_INPUT_READY - Data FIFO is ready to receive data.
//! - \b SHAMD5_INT_OUTPUT_READY - Context output registers are ready.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5IntEnable(uint32_t ui32Base, uint32_t ui32IntFlags)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
ASSERT((ui32IntFlags == SHAMD5_INT_CONTEXT_READY) ||
(ui32IntFlags == SHAMD5_INT_PARTHASH_READY) ||
(ui32IntFlags == SHAMD5_INT_INPUT_READY) ||
(ui32IntFlags == SHAMD5_INT_OUTPUT_READY));
//
// Enable the interrupt sources.
//
HWREG(DTHE_BASE + DTHE_O_SHA_IM) &= ~((ui32IntFlags & 0x00070000) >> 16);
HWREG(ui32Base + SHAMD5_O_IRQENABLE) |= ui32IntFlags & 0x0000ffff;
//
// Enable all interrupts.
//
HWREG(ui32Base + SHAMD5_O_SYSCONFIG) |= SHAMD5_SYSCONFIG_PIT_EN;
}
//*****************************************************************************
//
//! Disable interrupt sources in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param ui32IntFlags contains desired interrupts to disable.
//!
//! \e ui32IntFlags must be a logical OR of one or more of the following
//! values:
//!
//! - \b SHAMD5_INT_CONTEXT_READY - Context input registers are ready.
//! - \b SHAMD5_INT_PARTHASH_READY - Context output registers are ready after
//! a context switch.
//! - \b SHAMD5_INT_INPUT_READY - Data FIFO is ready to receive data.
//! - \b SHAMD5_INT_OUTPUT_READY - Context output registers are ready.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5IntDisable(uint32_t ui32Base, uint32_t ui32IntFlags)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
ASSERT((ui32IntFlags == SHAMD5_INT_CONTEXT_READY) ||
(ui32IntFlags == SHAMD5_INT_PARTHASH_READY) ||
(ui32IntFlags == SHAMD5_INT_INPUT_READY) ||
(ui32IntFlags == SHAMD5_INT_OUTPUT_READY));
//
// Clear the corresponding flags disabling the interrupt sources.
//
HWREG(DTHE_BASE + DTHE_O_SHA_IM) |= ((ui32IntFlags & 0x00070000) >> 16);
HWREG(ui32Base + SHAMD5_O_IRQENABLE) &= ~(ui32IntFlags & 0x0000ffff);
//
// If there are no interrupts enabled, then disable all interrupts.
//
if(HWREG(ui32Base + SHAMD5_O_IRQENABLE) == 0x0)
{
HWREG(ui32Base + SHAMD5_O_SYSCONFIG) &= ~SHAMD5_SYSCONFIG_PIT_EN;
}
}
//*****************************************************************************
//
//! Clears interrupt sources in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param ui32IntFlags contains desired interrupts to disable.
//!
//! \e ui32IntFlags must be a logical OR of one or more of the following
//! values:
//!
//! - \b SHAMD5_INT_CONTEXT_READY - Context input registers are ready.
//! - \b SHAMD5_INT_PARTHASH_READY - Context output registers are ready after
//! a context switch.
//! - \b SHAMD5_INT_INPUT_READY - Data FIFO is ready to receive data.
//! - \b SHAMD5_INT_OUTPUT_READY - Context output registers are ready.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5IntClear(uint32_t ui32Base, uint32_t ui32IntFlags)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
ASSERT((ui32IntFlags == SHAMD5_INT_CONTEXT_READY) ||
(ui32IntFlags == SHAMD5_INT_PARTHASH_READY) ||
(ui32IntFlags == SHAMD5_INT_INPUT_READY) ||
(ui32IntFlags == SHAMD5_INT_OUTPUT_READY));
//
// Clear the corresponding flags disabling the interrupt sources.
//
HWREG(DTHE_BASE + DTHE_O_SHA_IC) = ((ui32IntFlags & 0x00070000) >> 16);
}
//*****************************************************************************
//
//! Registers an interrupt handler for the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pfnHandler is a pointer to the function to be called when the
//! enabled SHA/MD5 interrupts occur.
//!
//! This function registers the interrupt handler in the interrupt vector
//! table, and enables SHA/MD5 interrupts on the interrupt controller;
//! specific SHA/MD5 interrupt sources must be enabled using
//! SHAMD5IntEnable(). The interrupt handler being registered must clear
//! the source of the interrupt using SHAMD5IntClear().
//!
//! If the application is using a static interrupt vector table stored in
//! flash, then it is not necessary to register the interrupt handler this way.
//! Instead, IntEnable() should be used to enable SHA/MD5 interrupts on the
//! interrupt controller.
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5IntRegister(uint32_t ui32Base, void(*pfnHandler)(void))
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Register the interrupt handler.
//
IntRegister(INT_SHA, pfnHandler);
//
// Enable the interrupt
//
IntEnable(INT_SHA);
}
//*****************************************************************************
//
//! Unregisters an interrupt handler for the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//!
//! This function unregisters the previously registered interrupt handler and
//! disables the interrupt in the interrupt controller.
//!
//! \sa IntRegister() for important information about registering interrupt
//! handlers.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5IntUnregister(uint32_t ui32Base)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Disable the interrupt.
//
IntDisable(INT_SHA);
//
// Unregister the interrupt handler.
//
IntUnregister(INT_SHA);
}
//*****************************************************************************
//
//! Write the hash length to the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param ui32Length is the hash length in bytes.
//!
//! This function writes the length of the hash data of the current operation
//! to the SHA/MD5 module. The value must be a multiple of 64 if the close
//! hash is not set in the mode register.
//!
//! \note When this register is written, hash processing is triggered.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5DataLengthSet(uint32_t ui32Base, uint32_t ui32Length)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Set the LENGTH register and start processing.
//
HWREG(ui32Base + SHAMD5_O_LENGTH) = ui32Length;
}
//*****************************************************************************
//
//! Writes the mode in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param ui32Mode is the mode of the SHA/MD5 module.
//!
//! This function writes the mode register configuring the SHA/MD5 module.
//!
//! The ui32Mode paramerter is a bit-wise OR of values:
//!
//! - \b SHAMD5_ALGO_MD5 - Regular hash with MD5
//! - \b SHAMD5_ALGO_SHA1 - Regular hash with SHA-1
//! - \b SHAMD5_ALGO_SHA224 - Regular hash with SHA-224
//! - \b SHAMD5_ALGO_SHA256 - Regular hash with SHA-256
//! - \b SHAMD5_ALGO_HMAC_MD5 - HMAC with MD5
//! - \b SHAMD5_ALGO_HMAC_SHA1 - HMAC with SHA-1
//! - \b SHAMD5_ALGO_HMAC_SHA224 - HMAC with SHA-224
//! - \b SHAMD5_ALGO_HMAC_SHA256 - HMAC with SHA-256
//!
//! \return None
//
//*****************************************************************************
void
SHAMD5ConfigSet(uint32_t ui32Base, uint32_t ui32Mode)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
ASSERT((ui32Mode == SHAMD5_ALGO_MD5) ||
(ui32Mode == SHAMD5_ALGO_SHA1) ||
(ui32Mode == SHAMD5_ALGO_SHA224) ||
(ui32Mode == SHAMD5_ALGO_SHA256) ||
(ui32Mode == SHAMD5_ALGO_HMAC_MD5) ||
(ui32Mode == SHAMD5_ALGO_HMAC_SHA1) ||
(ui32Mode == SHAMD5_ALGO_HMAC_SHA224) ||
(ui32Mode == SHAMD5_ALGO_HMAC_SHA256));
//
// Write the value in the MODE register.
//
HWREG(ui32Base + SHAMD5_O_MODE) = ui32Mode;
}
//*****************************************************************************
//
//! Perform a non-blocking write of 16 words of data to the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8Src is the pointer to the 16-word array of data that will be
//! written.
//!
//! This function writes 16 words of data into the data register.
//!
//! \return This function returns true if the write completed successfully.
//! It returns false if the module was not ready.
//
//*****************************************************************************
bool
SHAMD5DataWriteNonBlocking(uint32_t ui32Base, uint8_t *pui8Src)
{
uint32_t ui8Counter;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Check that the SHA/MD5 module is ready for data. If not, return false.
//
if((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_INPUT_READY) == 0)
{
return(false);
}
//
// Write the 16 words of data.
//
for(ui8Counter = 0; ui8Counter < 64; ui8Counter += 4)
{
HWREG(ui32Base + SHAMD5_O_DATA0_IN + ui8Counter) = *((uint32_t *)(pui8Src + ui8Counter));
}
//
// Return true as a sign of successfully completing the function.
//
return(true);
}
//*****************************************************************************
//
//! Perform a blocking write of 64 bytes of data to the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8Src is the pointer to the 64-byte array of data that will be
//! written.
//!
//! This function does not return until the module is ready to accept data and
//! the data has been written.
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5DataWrite(uint32_t ui32Base, uint8_t *pui8Src)
{
uint8_t ui8Counter;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Wait for the module to be ready to accept data.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_INPUT_READY) == 0)
{
}
//
// Write the 64 bytes of data.
//
for(ui8Counter = 0; ui8Counter < 64; ui8Counter += 4)
{
HWREG(ui32Base + SHAMD5_O_DATA0_IN + ui8Counter) =
*((uint32_t *) (pui8Src + ui8Counter));
}
}
//*****************************************************************************
//
//! Reads the result of a hashing operation.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8Dest is the pointer to the byte array of data that will be
//! written.
//!
//! This function does not return until the module is ready to accept data and
//! the data has been written.
//! -----------------------------------------
//! | Algorithm | Number of Words in Result |
//! -----------------------------------------
//! | MD5 | 16 Bytes (128 bits) |
//! | SHA-1 | 20 Bytes (160 bits) |
//! | SHA-224 | 28 Bytes (224 bits) |
//! | SHA-256 | 32 Bytes (256 bits) |
//! -----------------------------------------
//!
//! \return None.
//
//*****************************************************************************
void
SHAMD5ResultRead(uint32_t ui32Base, uint8_t *pui8Dest)
{
uint32_t ui32Idx, ui32Count;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Determine the number of bytes in the result, based on the hash type.
//
switch(HWREG(ui32Base + SHAMD5_O_MODE) & SHAMD5_MODE_ALGO_M)
{
//
// The MD5 hash is being used.
//
case SHAMD5_MODE_ALGO_MD5:
{
//
// There are 16 bytes in the MD5 hash.
//
ui32Count = 16;
//
// Done.
//
break;
}
//
// The SHA-1 hash is being used.
//
case SHAMD5_MODE_ALGO_SHA1:
{
//
// There are 20 bytes in the SHA-1 hash.
//
ui32Count = 20;
//
// Done.
//
break;
}
//
// The SHA-224 hash is being used.
//
case SHAMD5_MODE_ALGO_SHA224:
{
//
// There are 28 bytes in the SHA-224 hash.
//
ui32Count = 28;
//
// Done.
//
break;
}
//
// The SHA-256 hash is being used.
//
case SHAMD5_MODE_ALGO_SHA256:
{
//
// There are 32 bytes in the SHA-256 hash.
//
ui32Count = 32;
//
// Done.
//
break;
}
//
// The hash type is not recognized.
//
default:
{
//
// Return without reading a result since the hardware appears to be
// misconfigured.
//
return;
}
}
//
// Read the hash result.
//
for(ui32Idx = 0; ui32Idx < ui32Count; ui32Idx += 4)
{
*((uint32_t *)(pui8Dest+ui32Idx)) =
HWREG(ui32Base + SHAMD5_O_IDIGEST_A + ui32Idx);
}
}
//*****************************************************************************
//
//! Writes multiple words of data into the SHA/MD5 data registers.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8DataSrc is a pointer to an array of data to be written.
//! \param ui32DataLength is the length of the data to be written in bytes.
//!
//! This function writes a variable number of words into the SHA/MD5 data
//! registers. The function waits for each block of data to be processed
//! before another is written.
//!
//! \note This function is used by SHAMD5HashCompute(), SHAMD5HMACWithKPP(),
//! and SHAMD5HMACNoKPP() to process data.
//!
//! \return None.
//
//*****************************************************************************
static void
SHAMD5DataWriteMultiple(uint32_t ui32Base, uint8_t *pui8DataSrc,
uint32_t ui32DataLength)
{
uint32_t ui32Idx, ui32Count, ui32TempData=0, ui32Lastword;
uint8_t * ui8TempData;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Calculate the number of blocks of data.
//
ui32Count = ui32DataLength / 64;
//
// Loop through all the blocks and write them into the data registers
// making sure to block additional operations until we can write the
// next 16 words.
//
for(ui32Idx = 0; ui32Idx < ui32Count; ui32Idx++)
{
//
// Write the block of data.
//
SHAMD5DataWrite(ui32Base,pui8DataSrc);
//
// Increment the pointer to next block of data.
//
pui8DataSrc += 64;
}
//
// Calculate the remaining bytes of data that don't make up a full block.
//
ui32Count = ui32DataLength % 64;
//
// If there are bytes that do not make up a whole block, then
// write them separately.
//
if(ui32Count)
{
//
// Wait until the engine has finished processing the previous block.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) &
SHAMD5_INT_INPUT_READY) == 0)
{
}
//
// Loop through the remaining words.
//
ui32Count = ui32Count / 4;
for(ui32Idx = 0; ui32Idx < ui32Count; ui32Idx ++)
{
//
// Write the word into the data register.
//
HWREG(ui32Base + SHAMD5_O_DATA0_IN + (ui32Idx * 4)) =* ( (uint32_t *) pui8DataSrc);
pui8DataSrc +=4;
}
//
// Loop through the remaining bytes
//
ui32Count = ui32DataLength % 4;
ui8TempData = (uint8_t *) &ui32TempData;
if(ui32Count)
{
ui32Lastword = 0;
if(ui32Idx)
{
ui32Lastword = (ui32Idx-1) *4;
}
for(ui32Idx=0 ; ui32Idx<ui32Count ; ui32Idx++)
{
*(ui8TempData+ui32Idx) = *(pui8DataSrc+ui32Idx);
}
HWREG(ui32Base + SHAMD5_O_DATA0_IN + ui32Lastword) = ui32TempData;
}
}
}
//*****************************************************************************
//
//! Compute a hash using the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8DataSrc is a pointer to an array of data that contains the
//! data that will be hashed.
//! \param ui32DataLength specifies the length of the data to be hashed in
//! bytes.
//! \param pui8HashResult is a pointer to an array that holds the result
//! of the hashing operation.
//!
//! This function computes the hash of an array of data using the SHA/MD5
//! module.
//!
//! The length of the hash result is dependent on the algorithm that is in use.
//! The following table shows the correct array size for each algorithm:
//!
//! -----------------------------------------
//! | Algorithm | Number of Words in Result |
//! -----------------------------------------
//! | MD5 | 4 Words (128 bits) |
//! | SHA-1 | 5 Words (160 bits) |
//! | SHA-224 | 7 Words (224 bits) |
//! | SHA-256 | 8 Words (256 bits) |
//! -----------------------------------------
//!
//! \return None
//
//*****************************************************************************
bool
SHAMD5DataProcess(uint32_t ui32Base, uint8_t *pui8DataSrc,
uint32_t ui32DataLength, uint8_t *pui8HashResult)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
ASSERT((ui32DataLength % 64) == 0);
//
// Wait for the context to be ready before writing the mode.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_CONTEXT_READY) ==
0)
{
}
//
// Write the length.
//
SHAMD5DataLengthSet(ui32Base, ui32DataLength);
//
// Write the data.
//
SHAMD5DataWriteMultiple(ui32Base, pui8DataSrc, ui32DataLength);
//
// Wait for the output to be ready.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_OUTPUT_READY) ==
0)
{
}
//
// Read the result.
//
SHAMD5ResultRead(ui32Base, pui8HashResult);
//
// Return true to indicate successful completion of the function.
//
return(true);
}
//*****************************************************************************
//
//! Compute a HMAC with key pre-processing using the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8DataSrc is a pointer to an array of data that contains the
//! data that is to be hashed.
//! \param ui32DataLength specifies the length of the data to be hashed in
//! bytes.
//! \param pui8HashResult is a pointer to an array that holds the result
//! of the hashing operation.
//!
//! This function computes a HMAC with the given data using the SHA/MD5
//! module with a preprocessed key.
//!
//! The length of the hash result is dependent on the algorithm that is
//! selected with the \e ui32Algo argument. The following table shows the
//! correct array size for each algorithm:
//!
//! -----------------------------------------
//! | Algorithm | Number of Words in Result |
//! -----------------------------------------
//! | MD5 | 4 Words (128 bits) |
//! | SHA-1 | 5 Words (160 bits) |
//! | SHA-224 | 7 Words (224 bits) |
//! | SHA-256 | 8 Words (256 bits) |
//! -----------------------------------------
//!
//! \return None
//
//*****************************************************************************
bool
SHAMD5HMACProcess(uint32_t ui32Base, uint8_t *pui8DataSrc,
uint32_t ui32DataLength, uint8_t *pui8HashResult)
{
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Wait for the context to be ready before writing the mode.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_CONTEXT_READY) ==
0)
{
}
//
// Write the length.
//
SHAMD5DataLengthSet(ui32Base, ui32DataLength);
//
// Write the data in the registers.
//
SHAMD5DataWriteMultiple(ui32Base,pui8DataSrc, ui32DataLength);
//
// Wait for the output to be ready.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_OUTPUT_READY) ==
0)
{
}
//
// Read the result.
//
SHAMD5ResultRead(ui32Base, pui8HashResult);
//
// Return true to indicate successful completion of the function.
//
return(true);
}
//*****************************************************************************
//
//! Process an HMAC key using the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8Key is a pointer to an array that contains the key to be
//! processed.
//! \param pui8PPKey is the pointer to the array that contains the
//! pre-processed key.
//!
//! This function processes an HMAC key using the SHA/MD5. The resultant
//! pre-processed key can then be used with later HMAC operations to speed
//! processing time.
//!
//! The \e pui8Key array must be 512 bits long. If the key is
//! less than 512 bits, it must be padded with zeros. The
//! \e pui8PPKey array must each be 512 bits long.
//!
//! \return None
//
//*****************************************************************************
void
SHAMD5HMACPPKeyGenerate(uint32_t ui32Base, uint8_t *pui8Key,
uint8_t *pui8PPKey)
{
uint32_t ui32Index;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Wait for the context to be ready before writing the mode.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_CONTEXT_READY) ==
0)
{
}
//
// Write the HMAC key.
//
for(ui32Index = 0; ui32Index < 64; ui32Index += 4)
{
HWREG(ui32Base + SHAMD5_O_ODIGEST_A + ui32Index) =
*((uint32_t *)(pui8Key + ui32Index));
}
//
// Set the flag to cause the HMAC key to be pre-processed.
//
HWREG(ui32Base + SHAMD5_O_MODE) |= SHAMD5_MODE_HMAC_KEY_PROC;
//
// Set the length to zero to start the HMAC key pre-processing.
//
HWREG(ui32Base + SHAMD5_O_LENGTH) = 0;
//
// Wait for key to be processed.
//
while((HWREG(ui32Base + SHAMD5_O_IRQSTATUS) & SHAMD5_INT_OUTPUT_READY) ==
0)
{
}
//
// Read the pre-processed key from the SHA/MD5 module.
//
for(ui32Index = 0; ui32Index < 64; ui32Index += 4)
{
*((uint32_t *)(pui8PPKey+ui32Index)) =
HWREG(ui32Base + SHAMD5_O_ODIGEST_A + ui32Index);
}
}
//*****************************************************************************
//
//! Writes an HMAC key to the digest registers in the SHA/MD5 module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8Src is the pointer to the 16-word array of the HMAC key.
//!
//! This function is used to write HMAC key to the digest registers for
//! key preprocessing. The size of pui8Src must be 512 bytes. If the key is
//! less than 512 bytes, then it must be padded with zeros.
//!
//! \note It is recommended to use the SHAMD5GetIntStatus function to check
//! whether the context is ready before writing the key.
//!
//! \return None
//
//*****************************************************************************
void
SHAMD5HMACKeySet(uint32_t ui32Base, uint8_t *pui8Src)
{
uint32_t ui32Idx;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Write the key to the digest registers.
//
for(ui32Idx = 0; ui32Idx < 64; ui32Idx += 4)
{
HWREG(ui32Base + SHAMD5_O_ODIGEST_A + ui32Idx) =
* ((uint32_t *)(pui8Src + ui32Idx));
}
//
// Configure the SHA engine for HMAC operation.
//
HWREG(ui32Base + SHAMD5_O_MODE) |= (SHAMD5_MODE_HMAC_OUTER_HASH |
SHAMD5_MODE_HMAC_KEY_PROC |
SHAMD5_MODE_CLOSE_HASH);
}
//*****************************************************************************
//
//! Writes a pre-processed HMAC key to the digest registers in the SHA/MD5
//! module.
//!
//! \param ui32Base is the base address of the SHA/MD5 module.
//! \param pui8Src is the pointer to the 16-word array of the HMAC key.
//!
//! This function is used to write HMAC key to the digest registers for
//! key preprocessing. The size of pui8Src must be 512 bytes. If the key is
//! less than 512 bytes, then it must be padded with zeros.
//!
//! \note It is recommended to use the SHAMD5GetIntStatus function to check
//! whether the context is ready before writing the key.
//!
//! \return None
//
//*****************************************************************************
void
SHAMD5HMACPPKeySet(uint32_t ui32Base, uint8_t *pui8Src)
{
uint32_t ui32Idx;
//
// Check the arguments.
//
ASSERT(ui32Base == SHAMD5_BASE);
//
// Write the key to the digest registers.
//
for(ui32Idx = 0; ui32Idx < 64; ui32Idx += 4)
{
HWREG(ui32Base + SHAMD5_O_ODIGEST_A + ui32Idx) =
*((uint32_t *) (pui8Src + ui32Idx));
}
//
// Configure the SHA engine to continue the HMAC.
//
HWREG(ui32Base + SHAMD5_O_MODE) |= (SHAMD5_MODE_HMAC_OUTER_HASH |
SHAMD5_MODE_CLOSE_HASH);
//
// Write the digest count to 64 to account for the preprocessed key.
//
HWREG(ui32Base + SHAMD5_O_DIGEST_COUNT) = 64;
}
//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************
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