2 Unix SMB/CIFS implementation.
3 HMAC MD5 code for use in NTLMv2
4 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
5 Copyright (C) Andrew Tridgell 1992-2000
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* taken direct from rfc2104 implementation and modified for suitable use
27 #include "lib/crypto/crypto.h"
29 /***********************************************************************
30 the rfc 2104 version of hmac_md5 initialisation.
31 ***********************************************************************/
32 _PUBLIC_ void hmac_md5_init_rfc2104(const uint8_t *key, int key_len, HMACMD5Context *ctx)
37 /* if key is longer than 64 bytes reset it to key=MD5(key) */
40 struct MD5Context tctx;
43 MD5Update(&tctx, key, key_len);
50 /* start out by storing key in pads */
51 ZERO_STRUCT(ctx->k_ipad);
52 ZERO_STRUCT(ctx->k_opad);
53 memcpy( ctx->k_ipad, key, key_len);
54 memcpy( ctx->k_opad, key, key_len);
56 /* XOR key with ipad and opad values */
59 ctx->k_ipad[i] ^= 0x36;
60 ctx->k_opad[i] ^= 0x5c;
64 MD5Update(&ctx->ctx, ctx->k_ipad, 64);
67 /***********************************************************************
68 the microsoft version of hmac_md5 initialisation.
69 ***********************************************************************/
70 _PUBLIC_ void hmac_md5_init_limK_to_64(const uint8_t *key, int key_len,
73 /* if key is longer than 64 bytes truncate it */
79 hmac_md5_init_rfc2104(key, key_len, ctx);
82 /***********************************************************************
83 update hmac_md5 "inner" buffer
84 ***********************************************************************/
85 _PUBLIC_ void hmac_md5_update(const uint8_t *text, int text_len, HMACMD5Context *ctx)
87 MD5Update(&ctx->ctx, text, text_len); /* then text of datagram */
90 /***********************************************************************
91 finish off hmac_md5 "inner" buffer and generate outer one.
92 ***********************************************************************/
93 _PUBLIC_ void hmac_md5_final(uint8_t *digest, HMACMD5Context *ctx)
95 struct MD5Context ctx_o;
97 MD5Final(digest, &ctx->ctx);
100 MD5Update(&ctx_o, ctx->k_opad, 64);
101 MD5Update(&ctx_o, digest, 16);
102 MD5Final(digest, &ctx_o);
105 /***********************************************************
106 single function to calculate an HMAC MD5 digest from data.
107 use the microsoft hmacmd5 init method because the key is 16 bytes.
108 ************************************************************/
109 _PUBLIC_ void hmac_md5(const uint8_t key[16], const uint8_t *data, int data_len, uint8_t *digest)
112 hmac_md5_init_limK_to_64(key, 16, &ctx);
115 hmac_md5_update(data, data_len, &ctx);
117 hmac_md5_final(digest, &ctx);