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/* Sha256.h -- SHA-256 Hash
2021-01-01 : Igor Pavlov : Public domain */
#ifndef __7Z_SHA256_H
#define __7Z_SHA256_H
#include "7zTypes.h"
EXTERN_C_BEGIN
#define SHA256_NUM_BLOCK_WORDS 16
#define SHA256_NUM_DIGEST_WORDS 8
#define SHA256_BLOCK_SIZE (SHA256_NUM_BLOCK_WORDS * 4)
#define SHA256_DIGEST_SIZE (SHA256_NUM_DIGEST_WORDS * 4)
typedef void (MY_FAST_CALL *SHA256_FUNC_UPDATE_BLOCKS)(UInt32 state[8], const Byte *data, size_t numBlocks);
/*
if (the system supports different SHA256 code implementations)
{
(CSha256::func_UpdateBlocks) will be used
(CSha256::func_UpdateBlocks) can be set by
Sha256_Init() - to default (fastest)
Sha256_SetFunction() - to any algo
}
else
{
(CSha256::func_UpdateBlocks) is ignored.
}
*/
typedef struct
{
SHA256_FUNC_UPDATE_BLOCKS func_UpdateBlocks;
UInt64 count;
UInt64 __pad_2[2];
UInt32 state[SHA256_NUM_DIGEST_WORDS];
Byte buffer[SHA256_BLOCK_SIZE];
} CSha256;
#define SHA256_ALGO_DEFAULT 0
#define SHA256_ALGO_SW 1
#define SHA256_ALGO_HW 2
/*
Sha256_SetFunction()
return:
0 - (algo) value is not supported, and func_UpdateBlocks was not changed
1 - func_UpdateBlocks was set according (algo) value.
*/
BoolInt Sha256_SetFunction(CSha256 *p, unsigned algo);
void Sha256_InitState(CSha256 *p);
void Sha256_Init(CSha256 *p);
void Sha256_Update(CSha256 *p, const Byte *data, size_t size);
void Sha256_Final(CSha256 *p, Byte *digest);
// void MY_FAST_CALL Sha256_UpdateBlocks(UInt32 state[8], const Byte *data, size_t numBlocks);
/*
call Sha256Prepare() once at program start.
It prepares all supported implementations, and detects the fastest implementation.
*/
void Sha256Prepare(void);
EXTERN_C_END
#endif
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