File: hmacmd5.c

package info (click to toggle)
hydra 9.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 4,008 kB
  • sloc: ansic: 21,638; sh: 2,166; makefile: 110
file content (144 lines) | stat: -rw-r--r-- 4,285 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

/* 
   Unix SMB/CIFS implementation.
   HMAC MD5 code for use in NTLMv2
   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   Copyright (C) Andrew Tridgell 1992-2000
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc.
  
   Free Software Foundation
   51 Franklin Street, Fifth Floor
   Boston, MA 02110-1335
   USA

   Telephone: +1-617-542-5942
   Fax: +1-617-542-2652
   General email: info@fsf.org
*/

/* taken direct from rfc2104 implementation and modified for suitable use
 * for ntlmv2.
 */
#ifdef LIBOPENSSL

#include <string.h>
#include "hmacmd5.h"

#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))

/***********************************************************************
 the rfc 2104 version of hmac_md5 initialisation.
***********************************************************************/

void hmac_md5_init_rfc2104(const unsigned char *key, int32_t key_len, HMACMD5Context * ctx) {
  int32_t i;
  unsigned char tk[16];

  /* if key is longer than 64 bytes reset it to key=MD5(key) */
  if (key_len > 64) {
    MD5_CTX tctx;

    MD5_Init(&tctx);
    MD5_Update(&tctx, (void *) key, key_len);
    MD5_Final(tk, &tctx);

    key = tk;
    key_len = 16;
  }

  /* start out by storing key in pads */
  ZERO_STRUCT(ctx->k_ipad);
  ZERO_STRUCT(ctx->k_opad);
  memcpy(ctx->k_ipad, key, key_len);
  memcpy(ctx->k_opad, key, key_len);

  /* XOR key with ipad and opad values */
  for (i = 0; i < 64; i++) {
    ctx->k_ipad[i] ^= 0x36;
    ctx->k_opad[i] ^= 0x5c;
  }

  MD5_Init(&ctx->ctx);
  MD5_Update(&ctx->ctx, ctx->k_ipad, 64);
}

/***********************************************************************
 the microsoft version of hmac_md5 initialisation.
***********************************************************************/

void hmac_md5_init_limK_to_64(const unsigned char *key, int32_t key_len, HMACMD5Context * ctx) {
  int32_t i;

  /* if key is longer than 64 bytes truncate it */
  if (key_len > 64) {
    key_len = 64;
  }

  /* start out by storing key in pads */
  ZERO_STRUCT(ctx->k_ipad);
  ZERO_STRUCT(ctx->k_opad);
  memcpy(ctx->k_ipad, key, key_len);
  memcpy(ctx->k_opad, key, key_len);

  /* XOR key with ipad and opad values */
  for (i = 0; i < 64; i++) {
    ctx->k_ipad[i] ^= 0x36;
    ctx->k_opad[i] ^= 0x5c;
  }

  MD5_Init(&ctx->ctx);
  MD5_Update(&ctx->ctx, ctx->k_ipad, 64);
}

/***********************************************************************
 update hmac_md5 "inner" buffer
***********************************************************************/

void hmac_md5_update(const unsigned char *text, int32_t text_len, HMACMD5Context * ctx) {
  MD5_Update(&ctx->ctx, (void *) text, text_len);       /* then text of datagram */
}

/***********************************************************************
 finish off hmac_md5 "inner" buffer and generate outer one.
***********************************************************************/
void hmac_md5_final(unsigned char *digest, HMACMD5Context * ctx)
{
  MD5_CTX ctx_o;

  MD5_Final(digest, &ctx->ctx);

  MD5_Init(&ctx_o);
  MD5_Update(&ctx_o, ctx->k_opad, 64);
  MD5_Update(&ctx_o, digest, 16);
  MD5_Final(digest, &ctx_o);
}

/***********************************************************
 single function to calculate an HMAC MD5 digest from data.
 use the microsoft hmacmd5 init method because the key is 16 bytes.
************************************************************/

void hmac_md5(unsigned char key[16], unsigned char *data, int32_t data_len, unsigned char *digest) {
  HMACMD5Context ctx;

  hmac_md5_init_limK_to_64(key, 16, &ctx);
  if (data_len != 0) {
    hmac_md5_update(data, data_len, &ctx);
  }
  hmac_md5_final(digest, &ctx);
}

#endif