xref: /freebsd/lib/librpcsvc/xcrypt.c (revision 380a989b3223d455375b4fae70fd0b9bdd43bafb)
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"; */
43 static const char rcsid[] = "$Id: xcrypt.c,v 1.1 1996/11/12 02:36:12 wpaul Exp $";
44 #endif
45 
46 static char hex[];	/* forward */
47 static char hexval __P(( char ));
48 static void bin2hex __P(( int, unsigned char *, char * ));
49 static void hex2bin __P(( int, char *, char * ));
50 void 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  */
57 int
58 xencrypt(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  */
90 int
91 xdecrypt(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  */
122 void
123 passwd2des(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  */
141 static void
142 hex2bin(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  */
157 static void
158 bin2hex(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 
174 static char hex[16] = {
175 	'0', '1', '2', '3', '4', '5', '6', '7',
176 	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
177 };
178 
179 static char
180 hexval(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