xcrypt.c revision 175965 
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 175965 2008-02-04 07:56:36Z matteo $");
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	if ((buf = malloc((unsigned)len)) == NULL) {
71		return(0);
72	}
73
74	hex2bin(len, secret, buf);
75	passwd2des(passwd, key);
76	bzero(ivec, 8);
77
78	err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
79	if (DES_FAILED(err)) {
80		free(buf);
81		return (0);
82	}
83	bin2hex(len, (unsigned char *) buf, secret);
84	free(buf);
85	return (1);
86}
87
88/*
89 * Decrypt secret key using passwd
90 * The secret key is passed and returned in hex notation.
91 * Once again, the length is a multiple of 16 hex digits
92 */
93int
94xdecrypt(secret, passwd)
95	char *secret;
96	char *passwd;
97{
98	char key[8];
99	char ivec[8];
100	char *buf;
101	int err;
102	int len;
103
104	len = strlen(secret) / 2;
105	if ((buf = malloc((unsigned)len)) == NULL) {
106		return(0);
107	}
108
109	hex2bin(len, secret, buf);
110	passwd2des(passwd, key);
111	bzero(ivec, 8);
112
113	err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
114	if (DES_FAILED(err)) {
115		free(buf);
116		return (0);
117	}
118	bin2hex(len, (unsigned char *) buf, secret);
119	free(buf);
120	return (1);
121}
122
123
124/*
125 * Turn password into DES key
126 */
127void
128passwd2des(pw, key)
129	char *pw;
130	char *key;
131{
132	int i;
133
134	bzero(key, 8);
135	for (i = 0; *pw; i = (i+1)%8) {
136		key[i] ^= *pw++ << 1;
137	}
138	des_setparity(key);
139}
140
141
142
143/*
144 * Hex to binary conversion
145 */
146static void
147hex2bin(len, hexnum, binnum)
148	int len;
149	char *hexnum;
150	char *binnum;
151{
152	int i;
153
154	for (i = 0; i < len; i++) {
155		*binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
156	}
157}
158
159/*
160 * Binary to hex conversion
161 */
162static void
163bin2hex(len, binnum, hexnum)
164	int len;
165	unsigned char *binnum;
166	char *hexnum;
167{
168	int i;
169	unsigned val;
170
171	for (i = 0; i < len; i++) {
172		val = binnum[i];
173		hexnum[i*2] = hex[val >> 4];
174		hexnum[i*2+1] = hex[val & 0xf];
175	}
176	hexnum[len*2] = 0;
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