xcrypt.c revision 84220 
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 84220 2001-09-30 22:15:15Z dillon $");
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <rpc/des_crypt.h>
42
43static char hex[];	/* forward */
44static char hexval __P(( char ));
45static void bin2hex __P(( int, unsigned char *, char * ));
46static void hex2bin __P(( int, char *, char * ));
47void passwd2des __P(( char *, char * ));
48
49/*
50 * Encrypt a secret key given passwd
51 * The secret key is passed and returned in hex notation.
52 * Its length must be a multiple of 16 hex digits (64 bits).
53 */
54int
55xencrypt(secret, passwd)
56	char *secret;
57	char *passwd;
58{
59	char key[8];
60	char ivec[8];
61	char *buf;
62	int err;
63	int len;
64
65	len = strlen(secret) / 2;
66	buf = malloc((unsigned)len);
67
68	hex2bin(len, secret, buf);
69	passwd2des(passwd, key);
70	bzero(ivec, 8);
71
72	err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
73	if (DES_FAILED(err)) {
74		free(buf);
75		return (0);
76	}
77	bin2hex(len, (unsigned char *) buf, secret);
78	free(buf);
79	return (1);
80}
81
82/*
83 * Decrypt secret key using passwd
84 * The secret key is passed and returned in hex notation.
85 * Once again, the length is a multiple of 16 hex digits
86 */
87int
88xdecrypt(secret, passwd)
89	char *secret;
90	char *passwd;
91{
92	char key[8];
93	char ivec[8];
94	char *buf;
95	int err;
96	int len;
97
98	len = strlen(secret) / 2;
99	buf = malloc((unsigned)len);
100
101	hex2bin(len, secret, buf);
102	passwd2des(passwd, key);
103	bzero(ivec, 8);
104
105	err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
106	if (DES_FAILED(err)) {
107		free(buf);
108		return (0);
109	}
110	bin2hex(len, (unsigned char *) buf, secret);
111	free(buf);
112	return (1);
113}
114
115
116/*
117 * Turn password into DES key
118 */
119void
120passwd2des(pw, key)
121	char *pw;
122	char *key;
123{
124	int i;
125
126	bzero(key, 8);
127	for (i = 0; *pw; i = (i+1)%8) {
128		key[i] ^= *pw++ << 1;
129	}
130	des_setparity(key);
131}
132
133
134
135/*
136 * Hex to binary conversion
137 */
138static void
139hex2bin(len, hexnum, binnum)
140	int len;
141	char *hexnum;
142	char *binnum;
143{
144	int i;
145
146	for (i = 0; i < len; i++) {
147		*binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
148	}
149}
150
151/*
152 * Binary to hex conversion
153 */
154static void
155bin2hex(len, binnum, hexnum)
156	int len;
157	unsigned char *binnum;
158	char *hexnum;
159{
160	int i;
161	unsigned val;
162
163	for (i = 0; i < len; i++) {
164		val = binnum[i];
165		hexnum[i*2] = hex[val >> 4];
166		hexnum[i*2+1] = hex[val & 0xf];
167	}
168	hexnum[len*2] = 0;
169}
170
171static char hex[16] = {
172	'0', '1', '2', '3', '4', '5', '6', '7',
173	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
174};
175
176static char
177hexval(c)
178	char c;
179{
180	if (c >= '0' && c <= '9') {
181		return (c - '0');
182	} else if (c >= 'a' && c <= 'z') {
183		return (c - 'a' + 10);
184	} else if (c >= 'A' && c <= 'Z') {
185		return (c - 'A' + 10);
186	} else {
187		return (-1);
188	}
189}
190