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76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* Sha256.h -- SHA-256 Hash
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2023-04-02 : Igor Pavlov : Public domain */
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#ifndef ZIP7_INC_SHA256_H
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#define ZIP7_INC_SHA256_H
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#include "7zTypes.h"
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EXTERN_C_BEGIN
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#define SHA256_NUM_BLOCK_WORDS 16
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#define SHA256_NUM_DIGEST_WORDS 8
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#define SHA256_BLOCK_SIZE (SHA256_NUM_BLOCK_WORDS * 4)
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#define SHA256_DIGEST_SIZE (SHA256_NUM_DIGEST_WORDS * 4)
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typedef void (Z7_FASTCALL *SHA256_FUNC_UPDATE_BLOCKS)(UInt32 state[8], const Byte *data, size_t numBlocks);
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/*
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if (the system supports different SHA256 code implementations)
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{
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(CSha256::func_UpdateBlocks) will be used
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(CSha256::func_UpdateBlocks) can be set by
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Sha256_Init() - to default (fastest)
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Sha256_SetFunction() - to any algo
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}
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else
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{
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(CSha256::func_UpdateBlocks) is ignored.
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}
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*/
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typedef struct
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{
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SHA256_FUNC_UPDATE_BLOCKS func_UpdateBlocks;
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UInt64 count;
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UInt64 _pad_2[2];
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UInt32 state[SHA256_NUM_DIGEST_WORDS];
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Byte buffer[SHA256_BLOCK_SIZE];
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} CSha256;
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#define SHA256_ALGO_DEFAULT 0
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#define SHA256_ALGO_SW 1
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#define SHA256_ALGO_HW 2
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/*
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Sha256_SetFunction()
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return:
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0 - (algo) value is not supported, and func_UpdateBlocks was not changed
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1 - func_UpdateBlocks was set according (algo) value.
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*/
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BoolInt Sha256_SetFunction(CSha256 *p, unsigned algo);
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void Sha256_InitState(CSha256 *p);
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void Sha256_Init(CSha256 *p);
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void Sha256_Update(CSha256 *p, const Byte *data, size_t size);
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void Sha256_Final(CSha256 *p, Byte *digest);
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// void Z7_FASTCALL Sha256_UpdateBlocks(UInt32 state[8], const Byte *data, size_t numBlocks);
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/*
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call Sha256Prepare() once at program start.
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It prepares all supported implementations, and detects the fastest implementation.
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*/
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void Sha256Prepare(void);
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EXTERN_C_END
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#endif
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