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
41static char hex[16] = {
42	'0', '1', '2', '3', '4', '5', '6', '7',
43	'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
44};
45
46static char hexval( char );
47static void bin2hex( int, unsigned char *, char * );
48static void hex2bin( int, char *, char * );
49void 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 */
56int
57xencrypt(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 */
89int
90xdecrypt(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 */
121void
122passwd2des(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 */
138static void
139hex2bin(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 */
151static void
152bin2hex(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
165static char
166hexval(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