xcrypt.c revision 26213 
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 <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <sys/cdefs.h>
39#include <rpc/des_crypt.h>
40
41#ifndef lint
42/*from: static char sccsid[] = "@(#)xcrypt.c	2.2 88/08/10 4.0 RPCSRC"; */
43static const char rcsid[] = "$Id: xcrypt.c,v 1.1 1996/11/12 02:36:12 wpaul Exp $";
44#endif
45
46static char hex[];	/* forward */
47static char hexval __P(( char ));
48static void bin2hex __P(( int, unsigned char *, char * ));
49static void hex2bin __P(( int, char *, char * ));
50void passwd2des __P(( char *, char * ));
51
52/*
53 * Encrypt a secret key given passwd
54 * The secret key is passed and returned in hex notation.
55 * Its length must be a multiple of 16 hex digits (64 bits).
56 */
57int
58xencrypt(secret, passwd)
59	char *secret;
60	char *passwd;
61{
62	char key[8];
63	char ivec[8];
64	char *buf;
65	int err;
66	int len;
67
68	len = strlen(secret) / 2;
69	buf = malloc((unsigned)len);
70
71	hex2bin(len, secret, buf);
72	passwd2des(passwd, key);
73	bzero(ivec, 8);
74
75	err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
76	if (DES_FAILED(err)) {
77		free(buf);
78		return (0);
79	}
80	bin2hex(len, (unsigned char *) buf, secret);
81	free(buf);
82	return (1);
83}
84
85/*
86 * Decrypt secret key using passwd
87 * The secret key is passed and returned in hex notation.
88 * Once again, the length is a multiple of 16 hex digits
89 */
90int
91xdecrypt(secret, passwd)
92	char *secret;
93	char *passwd;
94{
95	char key[8];
96	char ivec[8];
97	char *buf;
98	int err;
99	int len;
100
101	len = strlen(secret) / 2;
102	buf = malloc((unsigned)len);
103
104	hex2bin(len, secret, buf);
105	passwd2des(passwd, key);
106	bzero(ivec, 8);
107
108	err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
109	if (DES_FAILED(err)) {
110		free(buf);
111		return (0);
112	}
113	bin2hex(len, (unsigned char *) buf, secret);
114	free(buf);
115	return (1);
116}
117
118
119/*
120 * Turn password into DES key
121 */
122void
123passwd2des(pw, key)
124	char *pw;
125	char *key;
126{
127	int i;
128
129	bzero(key, 8);
130	for (i = 0; *pw; i = (i+1)%8) {
131		key[i] ^= *pw++ << 1;
132	}
133	des_setparity(key);
134}
135
136
137
138/*
139 * Hex to binary conversion
140 */
141static void
142hex2bin(len, hexnum, binnum)
143	int len;
144	char *hexnum;
145	char *binnum;
146{
147	int i;
148
149	for (i = 0; i < len; i++) {
150		*binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
151	}
152}
153
154/*
155 * Binary to hex conversion
156 */
157static void
158bin2hex(len, binnum, hexnum)
159	int len;
160	unsigned char *binnum;
161	char *hexnum;
162{
163	int i;
164	unsigned val;
165
166	for (i = 0; i < len; i++) {
167		val = binnum[i];
168		hexnum[i*2] = hex[val >> 4];
169		hexnum[i*2+1] = hex[val & 0xf];
170	}
171	hexnum[len*2] = 0;
172}
173
174static char hex[16] = {
175	'0', '1', '2', '3', '4', '5', '6', '7',
176	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
177};
178
179static char
180hexval(c)
181	char c;
182{
183	if (c >= '0' && c <= '9') {
184		return (c - '0');
185	} else if (c >= 'a' && c <= 'z') {
186		return (c - 'a' + 10);
187	} else if (c >= 'A' && c <= 'Z') {
188		return (c - 'A' + 10);
189	} else {
190		return (-1);
191	}
192}
193