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
xencrypt(char * secret,char * passwd)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
xdecrypt(char * secret,char * passwd)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
passwd2des(char * pw,char * key)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
hex2bin(int len,char * hexnum,char * binnum)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
bin2hex(int len,unsigned char * binnum,char * hexnum)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
hexval(char c)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