xref: /freebsd/lib/librpcsvc/xcrypt.c (revision 1c05a6ea6b849ff95e539c31adea887c644a6a01)
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("$FreeBSD$");
37 
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <rpc/des_crypt.h>
42 
43 static char hex[16] = {
44 	'0', '1', '2', '3', '4', '5', '6', '7',
45 	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
46 };
47 
48 static char hexval( char );
49 static void bin2hex( int, unsigned char *, char * );
50 static void hex2bin( int, char *, char * );
51 void 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  */
58 int
59 xencrypt(char *secret, char *passwd)
60 {
61 	char key[8];
62 	char ivec[8];
63 	char *buf;
64 	int err;
65 	int len;
66 
67 	len = strlen(secret) / 2;
68 	if ((buf = malloc((unsigned)len)) == NULL) {
69 		return(0);
70 	}
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  */
91 int
92 xdecrypt(char *secret, char *passwd)
93 {
94 	char key[8];
95 	char ivec[8];
96 	char *buf;
97 	int err;
98 	int len;
99 
100 	len = strlen(secret) / 2;
101 	if ((buf = malloc((unsigned)len)) == NULL) {
102 		return(0);
103 	}
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  */
123 void
124 passwd2des(char *pw, char *key)
125 {
126 	int i;
127 
128 	bzero(key, 8);
129 	for (i = 0; *pw; i = (i+1)%8) {
130 		key[i] ^= *pw++ << 1;
131 	}
132 	des_setparity(key);
133 }
134 
135 
136 
137 /*
138  * Hex to binary conversion
139  */
140 static void
141 hex2bin(int len, char *hexnum, char *binnum)
142 {
143 	int i;
144 
145 	for (i = 0; i < len; i++) {
146 		*binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
147 	}
148 }
149 
150 /*
151  * Binary to hex conversion
152  */
153 static void
154 bin2hex(int len, unsigned char *binnum, char *hexnum)
155 {
156 	int i;
157 	unsigned val;
158 
159 	for (i = 0; i < len; i++) {
160 		val = binnum[i];
161 		hexnum[i*2] = hex[val >> 4];
162 		hexnum[i*2+1] = hex[val & 0xf];
163 	}
164 	hexnum[len*2] = 0;
165 }
166 
167 static char
168 hexval(char c)
169 {
170 	if (c >= '0' && c <= '9') {
171 		return (c - '0');
172 	} else if (c >= 'a' && c <= 'z') {
173 		return (c - 'a' + 10);
174 	} else if (c >= 'A' && c <= 'Z') {
175 		return (c - 'A' + 10);
176 	} else {
177 		return (-1);
178 	}
179 }
180