summary refs log tree commit diff
path: root/sunrpc/xcrypt.c
blob: f430a1dab628fa17abcff679e5f390f00bbc7250 (plain) (blame)
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
/*
 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#if 0
#ident	"@(#)xcrypt.c	1.11	94/08/23 SMI"
#endif

#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xcrypt.c 1.3 89/03/24 Copyr 1986 Sun Micro";
#endif

/*
 * xcrypt.c: Hex encryption/decryption and utility routines
 */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <rpc/des_crypt.h>

static const char hex[16] =
{
  '0', '1', '2', '3', '4', '5', '6', '7',
  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
};


#ifdef _LIBC
# define hexval(c) \
  (c >= '0' && c <= '9'							      \
   ? c - '0'								      \
   : ({	int upp = toupper (c);						      \
	upp >= 'A' && upp <= 'Z' ? upp - 'A' + 10 : -1; }))
#else
static char hexval (char) internal_function;
#endif

static void hex2bin (int, char *, char *) internal_function;
static void bin2hex (int, unsigned char *, char *) internal_function;
void passwd2des_internal (char *pw, char *key);
#ifdef _LIBC
libc_hidden_proto (passwd2des_internal)
#endif

/*
 * Turn password into DES key
 */
void
passwd2des_internal (char *pw, char *key)
{
  int i;

  memset (key, 0, 8);
  for (i = 0; *pw && i < 8; ++i)
    key[i] ^= *pw++ << 1;

  des_setparity (key);
}

#ifdef _LIBC
libc_hidden_def (passwd2des_internal)
strong_alias (passwd2des_internal, passwd2des)
#else
void passwd2des (char *pw, char *key)
{
  return passwd2des_internal (pw, key);
}
#endif

/*
 * Encrypt a secret key given passwd
 * The secret key is passed and returned in hex notation.
 * Its length must be a multiple of 16 hex digits (64 bits).
 */
int
xencrypt (char *secret, char *passwd)
{
  char key[8];
  char ivec[8];
  char *buf;
  int err;
  int len;

  len = strlen (secret) / 2;
  buf = malloc ((unsigned) len);
  hex2bin (len, secret, buf);
  passwd2des_internal (passwd, key);
  memset (ivec, 0, 8);

  err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
  if (DES_FAILED (err))
    {
      free (buf);
      return 0;
    }
  bin2hex (len, (unsigned char *) buf, secret);
  free (buf);
  return 1;
}

/*
 * Decrypt secret key using passwd
 * The secret key is passed and returned in hex notation.
 * Once again, the length is a multiple of 16 hex digits
 */
int
xdecrypt (char *secret, char *passwd)
{
  char key[8];
  char ivec[8];
  char *buf;
  int err;
  int len;

  len = strlen (secret) / 2;
  buf = malloc ((unsigned) len);

  hex2bin (len, secret, buf);
  passwd2des_internal (passwd, key);
  memset (ivec, 0, 8);

  err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
  if (DES_FAILED (err))
    {
      free (buf);
      return 0;
    }
  bin2hex (len, (unsigned char *) buf, secret);
  free (buf);
  return 1;
}

/*
 * Hex to binary conversion
 */
static void
internal_function
hex2bin (int len, char *hexnum, char *binnum)
{
  int i;

  for (i = 0; i < len; i++)
    *binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
}

/*
 * Binary to hex conversion
 */
static void
internal_function
bin2hex (int len, unsigned char *binnum, char *hexnum)
{
  int i;
  unsigned val;

  for (i = 0; i < len; i++)
    {
      val = binnum[i];
      hexnum[i * 2] = hex[val >> 4];
      hexnum[i * 2 + 1] = hex[val & 0xf];
    }
  hexnum[len * 2] = 0;
}

#ifndef _LIBC
static char
hexval (char c)
{
  if (c >= '0' && c <= '9')
    return (c - '0');
  else if (c >= 'a' && c <= 'z')
    return (c - 'a' + 10);
  else if (c >= 'A' && c <= 'Z')
    return (c - 'A' + 10);
  else
    return -1;
}
#endif