xcrypt.c revision 146841 
1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29/*
30 * Hex encryption/decryption and utility routines
31 *
32 * Copyright (C) 1986, Sun Microsystems, Inc.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: head/lib/librpcsvc/xcrypt.c 146841 2005-05-31 21:19:14Z stefanf $");
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <rpc/des_crypt.h>
42
43static char hex[16] = {
44	'0', '1', '2', '3', '4', '5', '6', '7',
45	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
46};
47
48static char hexval( char );
49static void bin2hex( int, unsigned char *, char * );
50static void hex2bin( int, char *, char * );
51void passwd2des( char *, char * );
52
53/*
54 * Encrypt a secret key given passwd
55 * The secret key is passed and returned in hex notation.
56 * Its length must be a multiple of 16 hex digits (64 bits).
57 */
58int
59xencrypt(secret, passwd)
60	char *secret;
61	char *passwd;
62{
63	char key[8];
64	char ivec[8];
65	char *buf;
66	int err;
67	int len;
68
69	len = strlen(secret) / 2;
70	buf = malloc((unsigned)len);
71
72	hex2bin(len, secret, buf);
73	passwd2des(passwd, key);
74	bzero(ivec, 8);
75
76	err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
77	if (DES_FAILED(err)) {
78		free(buf);
79		return (0);
80	}
81	bin2hex(len, (unsigned char *) buf, secret);
82	free(buf);
83	return (1);
84}
85
86/*
87 * Decrypt secret key using passwd
88 * The secret key is passed and returned in hex notation.
89 * Once again, the length is a multiple of 16 hex digits
90 */
91int
92xdecrypt(secret, passwd)
93	char *secret;
94	char *passwd;
95{
96	char key[8];
97	char ivec[8];
98	char *buf;
99	int err;
100	int len;
101
102	len = strlen(secret) / 2;
103	buf = malloc((unsigned)len);
104
105	hex2bin(len, secret, buf);
106	passwd2des(passwd, key);
107	bzero(ivec, 8);
108
109	err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
110	if (DES_FAILED(err)) {
111		free(buf);
112		return (0);
113	}
114	bin2hex(len, (unsigned char *) buf, secret);
115	free(buf);
116	return (1);
117}
118
119
120/*
121 * Turn password into DES key
122 */
123void
124passwd2des(pw, key)
125	char *pw;
126	char *key;
127{
128	int i;
129
130	bzero(key, 8);
131	for (i = 0; *pw; i = (i+1)%8) {
132		key[i] ^= *pw++ << 1;
133	}
134	des_setparity(key);
135}
136
137
138
139/*
140 * Hex to binary conversion
141 */
142static void
143hex2bin(len, hexnum, binnum)
144	int len;
145	char *hexnum;
146	char *binnum;
147{
148	int i;
149
150	for (i = 0; i < len; i++) {
151		*binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
152	}
153}
154
155/*
156 * Binary to hex conversion
157 */
158static void
159bin2hex(len, binnum, hexnum)
160	int len;
161	unsigned char *binnum;
162	char *hexnum;
163{
164	int i;
165	unsigned val;
166
167	for (i = 0; i < len; i++) {
168		val = binnum[i];
169		hexnum[i*2] = hex[val >> 4];
170		hexnum[i*2+1] = hex[val & 0xf];
171	}
172	hexnum[len*2] = 0;
173}
174
175static char
176hexval(c)
177	char c;
178{
179	if (c >= '0' && c <= '9') {
180		return (c - '0');
181	} else if (c >= 'a' && c <= 'z') {
182		return (c - 'a' + 10);
183	} else if (c >= 'A' && c <= 'Z') {
184		return (c - 'A' + 10);
185	} else {
186		return (-1);
187	}
188}
189