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// HmacSha1.cpp
#include "StdAfx.h"
#include "HmacSha1.h"
namespace NCrypto {
namespace NSha1 {
void CHmac::SetKey(const Byte *key, size_t keySize)
{
Byte keyTemp[kBlockSize];
size_t i;
for (i = 0; i < kBlockSize; i++)
keyTemp[i] = 0;
if(keySize > kBlockSize)
{
_sha.Init();
_sha.Update(key, keySize);
_sha.Final(keyTemp);
keySize = kDigestSize;
}
else
for (i = 0; i < keySize; i++)
keyTemp[i] = key[i];
for (i = 0; i < kBlockSize; i++)
keyTemp[i] ^= 0x36;
_sha.Init();
_sha.Update(keyTemp, kBlockSize);
for (i = 0; i < kBlockSize; i++)
keyTemp[i] ^= 0x36 ^ 0x5C;
_sha2.Init();
_sha2.Update(keyTemp, kBlockSize);
}
void CHmac::Final(Byte *mac, size_t macSize)
{
Byte digest[kDigestSize];
_sha.Final(digest);
_sha2.Update(digest, kDigestSize);
_sha2.Final(digest);
for(size_t i = 0; i < macSize; i++)
mac[i] = digest[i];
}
void CHmac32::SetKey(const Byte *key, size_t keySize)
{
UInt32 keyTemp[kBlockSizeInWords];
size_t i;
for (i = 0; i < kBlockSizeInWords; i++)
keyTemp[i] = 0;
if(keySize > kBlockSize)
{
CContext sha;
sha.Init();
sha.Update(key, keySize);
Byte digest[kDigestSize];
sha.Final(digest);
for (int i = 0 ; i < kDigestSizeInWords; i++)
keyTemp[i] =
((UInt32)(digest[i * 4 + 0]) << 24) |
((UInt32)(digest[i * 4 + 1]) << 16) |
((UInt32)(digest[i * 4 + 2]) << 8) |
((UInt32)(digest[i * 4 + 3]));
keySize = kDigestSizeInWords;
}
else
for (size_t i = 0; i < keySize; i++)
keyTemp[i / 4] |= (key[i] << (24 - 8 * (i & 3)));
for (i = 0; i < kBlockSizeInWords; i++)
keyTemp[i] ^= 0x36363636;
_sha.Init();
_sha.Update(keyTemp, kBlockSizeInWords);
for (i = 0; i < kBlockSizeInWords; i++)
keyTemp[i] ^= 0x36363636 ^ 0x5C5C5C5C;
_sha2.Init();
_sha2.Update(keyTemp, kBlockSizeInWords);
}
void CHmac32::Final(UInt32 *mac, size_t macSize)
{
UInt32 digest[kDigestSizeInWords];
_sha.Final(digest);
_sha2.Update(digest, kDigestSizeInWords);
_sha2.Final(digest);
for(size_t i = 0; i < macSize; i++)
mac[i] = digest[i];
}
void CHmac32::GetLoopXorDigest(UInt32 *mac, UInt32 numIteration)
{
UInt32 block[kBlockSizeInWords];
UInt32 block2[kBlockSizeInWords];
_sha.PrepareBlock(block, kDigestSizeInWords);
_sha2.PrepareBlock(block2, kDigestSizeInWords);
for(unsigned int s = 0; s < kDigestSizeInWords; s++)
block[s] = mac[s];
for(UInt32 i = 0; i < numIteration; i++)
{
_sha.GetBlockDigest(block, block2);
_sha2.GetBlockDigest(block2, block);
for (unsigned int s = 0; s < kDigestSizeInWords; s++)
mac[s] ^= block[s];
}
}
}}
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