63 lines
1.1 KiB
C++
63 lines
1.1 KiB
C++
// HmacSha256.cpp
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#include "StdAfx.h"
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#include "../../../C/CpuArch.h"
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#include "HmacSha256.h"
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namespace NCrypto {
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namespace NSha256 {
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static const unsigned kBlockSize = 64;
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void CHmac::SetKey(const Byte *key, size_t keySize)
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{
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Byte temp[kBlockSize];
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size_t i;
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for (i = 0; i < kBlockSize; i++)
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temp[i] = 0;
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if (keySize > kBlockSize)
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{
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Sha256_Init(&_sha);
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Sha256_Update(&_sha, key, keySize);
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Sha256_Final(&_sha, temp);
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}
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else
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for (i = 0; i < keySize; i++)
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temp[i] = key[i];
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for (i = 0; i < kBlockSize; i++)
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temp[i] ^= 0x36;
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Sha256_Init(&_sha);
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Sha256_Update(&_sha, temp, kBlockSize);
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for (i = 0; i < kBlockSize; i++)
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temp[i] ^= 0x36 ^ 0x5C;
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Sha256_Init(&_sha2);
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Sha256_Update(&_sha2, temp, kBlockSize);
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}
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void CHmac::Final(Byte *mac)
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{
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Sha256_Final(&_sha, mac);
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Sha256_Update(&_sha2, mac, SHA256_DIGEST_SIZE);
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Sha256_Final(&_sha2, mac);
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}
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/*
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void CHmac::Final(Byte *mac, size_t macSize)
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{
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Byte digest[SHA256_DIGEST_SIZE];
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Final(digest);
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for (size_t i = 0; i < macSize; i++)
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mac[i] = digest[i];
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}
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*/
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}}
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