78 lines
2.1 KiB
C
78 lines
2.1 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, 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, 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);
|
|
}
|