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