2 * Copyright 2006 Kai Blin
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
18 * This file implements RFC 2104 (HMAC) for the MD5 provider.
19 * It is needed for NTLM2 signing and sealing.
24 void HMACMD5Init(HMAC_MD5_CTX *ctx, const unsigned char *key, unsigned int key_len)
27 unsigned char inner_padding[64];
28 unsigned char temp_key[16];
35 MD5Update(&temp_ctx, key, key_len);
37 memcpy(temp_key, temp_ctx.digest, 16);
43 memset(inner_padding, 0, 64);
44 memset(ctx->outer_padding, 0, 64);
45 memcpy(inner_padding, key, key_len);
46 memcpy(ctx->outer_padding, key, key_len);
48 for(i = 0; i < 64; ++i)
50 inner_padding[i] ^= 0x36;
51 ctx->outer_padding[i] ^= 0x5c;
55 MD5Update(&(ctx->ctx), inner_padding, 64);
58 void HMACMD5Update(HMAC_MD5_CTX *ctx, const unsigned char *data, unsigned int data_len)
60 MD5Update(&(ctx->ctx), data, data_len);
63 void HMACMD5Final(HMAC_MD5_CTX *ctx, unsigned char *digest)
66 unsigned char inner_digest[16];
68 MD5Final(&(ctx->ctx));
69 memcpy(inner_digest, ctx->ctx.digest, 16);
72 MD5Update(&outer_ctx, ctx->outer_padding, 64);
73 MD5Update(&outer_ctx, inner_digest, 16);
76 memcpy(digest, outer_ctx.digest, 16);