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