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// HmacSha1.cpp
#include "StdAfx.h"
#include <string.h>
#include "../../../C/CpuArch.h"
#include "HmacSha1.h"
namespace NCrypto {
namespace NSha1 {
void CHmac::SetKey(const Byte *key, size_t keySize)
{
MY_ALIGN (16)
UInt32 temp[SHA1_NUM_BLOCK_WORDS];
size_t i;
for (i = 0; i < SHA1_NUM_BLOCK_WORDS; i++)
temp[i] = 0;
if (keySize > kBlockSize)
{
_sha.Init();
_sha.Update(key, keySize);
_sha.Final((Byte *)temp);
}
else
memcpy(temp, key, keySize);
for (i = 0; i < SHA1_NUM_BLOCK_WORDS; i++)
temp[i] ^= 0x36363636;
_sha.Init();
_sha.Update((const Byte *)temp, kBlockSize);
for (i = 0; i < SHA1_NUM_BLOCK_WORDS; i++)
temp[i] ^= 0x36363636 ^ 0x5C5C5C5C;
_sha2.Init();
_sha2.Update((const Byte *)temp, kBlockSize);
}
void CHmac::Final(Byte *mac)
{
_sha.Final(mac);
_sha2.Update(mac, kDigestSize);
_sha2.Final(mac);
}
void CHmac::GetLoopXorDigest1(void *mac, UInt32 numIteration)
{
MY_ALIGN (16) UInt32 block [SHA1_NUM_BLOCK_WORDS];
MY_ALIGN (16) UInt32 block2[SHA1_NUM_BLOCK_WORDS];
MY_ALIGN (16) UInt32 mac2 [SHA1_NUM_BLOCK_WORDS];
_sha. PrepareBlock((Byte *)block, SHA1_DIGEST_SIZE);
_sha2.PrepareBlock((Byte *)block2, SHA1_DIGEST_SIZE);
block[0] = ((const UInt32 *)mac)[0];
block[1] = ((const UInt32 *)mac)[1];
block[2] = ((const UInt32 *)mac)[2];
block[3] = ((const UInt32 *)mac)[3];
block[4] = ((const UInt32 *)mac)[4];
mac2[0] = block[0];
mac2[1] = block[1];
mac2[2] = block[2];
mac2[3] = block[3];
mac2[4] = block[4];
for (UInt32 i = 0; i < numIteration; i++)
{
_sha. GetBlockDigest((const Byte *)block, (Byte *)block2);
_sha2.GetBlockDigest((const Byte *)block2, (Byte *)block);
mac2[0] ^= block[0];
mac2[1] ^= block[1];
mac2[2] ^= block[2];
mac2[3] ^= block[3];
mac2[4] ^= block[4];
}
((UInt32 *)mac)[0] = mac2[0];
((UInt32 *)mac)[1] = mac2[1];
((UInt32 *)mac)[2] = mac2[2];
((UInt32 *)mac)[3] = mac2[3];
((UInt32 *)mac)[4] = mac2[4];
}
}}
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