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/*******************************************************************************
* Copyright (C) 2020, Huada Semiconductor Co., Ltd. All rights reserved.
*
* This software component is licensed by HDSC under BSD 3-Clause license
* (the "License"); You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*/
/******************************************************************************/
/** \file hc32f460_hash.c
**
** A detailed description is available at
** @link HashGroup HASH description @endlink
**
** - 2018-10-18 CDT First version for Device Driver Library of HASH.
**
******************************************************************************/
/*******************************************************************************
* Include files
******************************************************************************/
#include "hc32f460_hash.h"
#include "hc32f460_utility.h"
/**
*******************************************************************************
** \addtogroup HashGroup
******************************************************************************/
//@{
/*******************************************************************************
* Local type definitions ('typedef')
******************************************************************************/
/*******************************************************************************
* Local pre-processor symbols/macros ('#define')
******************************************************************************/
/* Constants definitions. */
#define HASH_GROUP_LEN (64u)
#define LAST_GROUP_MAX_LEN (56u)
/*******************************************************************************
* Global variable definitions (declared in header file with 'extern')
******************************************************************************/
/*******************************************************************************
* Local function prototypes ('static')
******************************************************************************/
static void HASH_WriteData(const uint8_t *pu8SrcData);
static void HASH_GetMsgDigest(uint8_t *pu8MsgDigest);
/*******************************************************************************
* Local variable definitions ('static')
******************************************************************************/
/*******************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief Initialize the HASH.
**
** \param None
**
** \retval None
**
******************************************************************************/
void HASH_Init(void)
{
/* Stop hash calculating */
bM4_HASH_CR_START = 0u;
}
/**
*******************************************************************************
** \brief DeInitialize the HASH.
**
** \param None
**
** \retval None
**
******************************************************************************/
void HASH_DeInit(void)
{
/* Stop hash calculating */
bM4_HASH_CR_START = 0u;
/* Reset register CR. */
M4_HASH->CR = 0u;
}
/**
*******************************************************************************
** \brief HASH(SHA256) processes pu8SrcData.
**
** \param [in] pu8SrcData Pointer to the source data buffer (buffer to
** be hashed).
**
** \param [in] u32SrcDataSize Length of the input buffer in bytes.
**
** \param [out] pu8MsgDigest Pointer to the computed digest. Its size
** must be 32 bytes.
**
** \param [in] u32Timeout Timeout value.
**
** \retval Ok No error occurred.
** \retval ErrorTimeout HASH works timeout.
** \retval ErrorInvalidParameter Parameter error.
**
******************************************************************************/
en_result_t HASH_Start(const uint8_t *pu8SrcData,
uint32_t u32SrcDataSize,
uint8_t *pu8MsgDigest,
uint32_t u32Timeout)
{
en_result_t enRet = ErrorInvalidParameter;
uint8_t u8FillBuffer[HASH_GROUP_LEN];
uint8_t u8FirstGroup = 0u;
uint8_t u8HashEnd = 0u;
uint8_t u8DataEndMark = 0u;
uint32_t u32Index = 0u;
uint32_t u32BitLenHi;
uint32_t u32BitLenLo;
uint32_t u32HashTimeout;
__IO uint32_t u32TimeCount;
if ((NULL != pu8SrcData) &&
(0u != u32SrcDataSize) &&
(NULL != pu8MsgDigest) &&
(0u != u32Timeout))
{
/* 10 is the number of required instructions cycles for the below loop statement. */
u32HashTimeout = u32Timeout * (SystemCoreClock / 10u / 1000u);
u32BitLenHi = (u32SrcDataSize >> 29u) & 0x7u;
u32BitLenLo = (u32SrcDataSize << 3u);
while (1u)
{
/* Stop hash calculating. */
bM4_HASH_CR_START = 0u;
if (u32SrcDataSize >= HASH_GROUP_LEN)
{
HASH_WriteData(&pu8SrcData[u32Index]);
u32SrcDataSize -= HASH_GROUP_LEN;
u32Index += HASH_GROUP_LEN;
}
else if (u32SrcDataSize >= LAST_GROUP_MAX_LEN)
{
memset(u8FillBuffer, 0, HASH_GROUP_LEN);
memcpy(u8FillBuffer, &pu8SrcData[u32Index], u32SrcDataSize);
u8FillBuffer[u32SrcDataSize] = 0x80u;
u8DataEndMark = 1u;
HASH_WriteData(u8FillBuffer);
u32SrcDataSize = 0u;
}
else
{
u8HashEnd = 1u;
}
if (u8HashEnd != 0u)
{
memset(u8FillBuffer, 0, HASH_GROUP_LEN);
if (u32SrcDataSize > 0u)
{
memcpy(u8FillBuffer, &pu8SrcData[u32Index], u32SrcDataSize);
}
if (u8DataEndMark == 0u)
{
u8FillBuffer[u32SrcDataSize] = 0x80u;
}
u8FillBuffer[63u] = (uint8_t)(u32BitLenLo);
u8FillBuffer[62u] = (uint8_t)(u32BitLenLo >> 8u);
u8FillBuffer[61u] = (uint8_t)(u32BitLenLo >> 16u);
u8FillBuffer[60u] = (uint8_t)(u32BitLenLo >> 24u);
u8FillBuffer[59u] = (uint8_t)(u32BitLenHi);
u8FillBuffer[58u] = (uint8_t)(u32BitLenHi >> 8u);
u8FillBuffer[57u] = (uint8_t)(u32BitLenHi >> 16u);
u8FillBuffer[56u] = (uint8_t)(u32BitLenHi >> 24u);
HASH_WriteData(u8FillBuffer);
}
/* check if first group */
if (0u == u8FirstGroup)
{
u8FirstGroup = 1u;
/* Set first group. */
bM4_HASH_CR_FST_GRP = 1u;
}
else
{
/* Set continuous group. */
bM4_HASH_CR_FST_GRP = 0u;
}
/* Start hash calculating. */
bM4_HASH_CR_START = 1u;
u32TimeCount = 0u;
enRet = ErrorTimeout;
while (u32TimeCount < u32HashTimeout)
{
if (bM4_HASH_CR_START == 0u)
{
enRet = Ok;
break;
}
u32TimeCount++;
}
if ((ErrorTimeout == enRet) || (u8HashEnd != 0u))
{
break;
}
}
if (Ok == enRet)
{
/* HASH calculated done */
HASH_GetMsgDigest(pu8MsgDigest);
}
/* Stop hash calculating. */
bM4_HASH_CR_START = 0u;
}
return enRet;
}
/*******************************************************************************
* Function implementation - local ('static')
******************************************************************************/
/**
*******************************************************************************
** \brief Writes the input buffer in data register.
**
** \param [in] pu8SrcData Pointer to source data buffer.
**
** \retval None
**
******************************************************************************/
static void HASH_WriteData(const uint8_t *pu8SrcData)
{
uint8_t i;
uint8_t j;
uint32_t u32Temp;
__IO uint32_t *io32HashDr = &(M4_HASH->DR15);
for (i = 0u; i < 16u; i++)
{
j = i * 4u + 3u;
u32Temp = (uint32_t)pu8SrcData[j];
u32Temp |= ((uint32_t)pu8SrcData[j-1u]) << 8u;
u32Temp |= ((uint32_t)pu8SrcData[j-2u]) << 16u;
u32Temp |= ((uint32_t)pu8SrcData[j-3u]) << 24u;
*io32HashDr = u32Temp;
io32HashDr++;
}
}
/**
*******************************************************************************
** \brief Provides the message digest result.
**
** \param [out] pu8MsgDigest Pointer to the message digest.
**
** \retval None
**
******************************************************************************/
static void HASH_GetMsgDigest(uint8_t *pu8MsgDigest)
{
uint8_t i;
uint8_t j;
uint32_t u32Temp;
__IO uint32_t *io32HashHr = &(M4_HASH->HR7);
for (i = 0u; i < 8u; i++)
{
j = i * 4u + 3u;
u32Temp = *io32HashHr;
pu8MsgDigest[j] = (uint8_t)u32Temp;
pu8MsgDigest[j-1u] = (uint8_t)(u32Temp >> 8u);
pu8MsgDigest[j-2u] = (uint8_t)(u32Temp >> 16u);
pu8MsgDigest[j-3u] = (uint8_t)(u32Temp >> 24u);
io32HashHr++;
}
}
//@} // HashGroup
/*******************************************************************************
* EOF (not truncated)
******************************************************************************/
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