wine/dlls/secur32/hmac_md5.c
2007-08-27 12:01:47 +02:00

78 lines
2.2 KiB
C

/*
* Copyright 2006 Kai Blin
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* This file implements RFC 2104 (HMAC) for the MD5 provider.
* It is needed for NTLMv2 signing and sealing.
*/
#include "hmac_md5.h"
void HMACMD5Init(HMAC_MD5_CTX *ctx, const unsigned char *key, unsigned int key_len)
{
int i;
unsigned char inner_padding[64];
unsigned char temp_key[16];
if(key_len > 64)
{
MD5_CTX temp_ctx;
MD5Init(&temp_ctx);
MD5Update(&temp_ctx, key, key_len);
MD5Final(&temp_ctx);
memcpy(temp_key, temp_ctx.digest, 16);
key = temp_key;
key_len = 16;
}
memset(inner_padding, 0, 64);
memset(ctx->outer_padding, 0, 64);
memcpy(inner_padding, key, key_len);
memcpy(ctx->outer_padding, key, key_len);
for(i = 0; i < 64; ++i)
{
inner_padding[i] ^= 0x36;
ctx->outer_padding[i] ^= 0x5c;
}
MD5Init(&(ctx->ctx));
MD5Update(&(ctx->ctx), inner_padding, 64);
}
void HMACMD5Update(HMAC_MD5_CTX *ctx, const unsigned char *data, unsigned int data_len)
{
MD5Update(&(ctx->ctx), data, data_len);
}
void HMACMD5Final(HMAC_MD5_CTX *ctx, unsigned char *digest)
{
MD5_CTX outer_ctx;
unsigned char inner_digest[16];
MD5Final(&(ctx->ctx));
memcpy(inner_digest, ctx->ctx.digest, 16);
MD5Init(&outer_ctx);
MD5Update(&outer_ctx, ctx->outer_padding, 64);
MD5Update(&outer_ctx, inner_digest, 16);
MD5Final(&outer_ctx);
memcpy(digest, outer_ctx.digest, 16);
}