des_crypt.c revision 26219 
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 * des_crypt.c, DES encryption library routines
31 * Copyright (C) 1986, Sun Microsystems, Inc.
32 */
33
34#include <sys/types.h>
35#include <rpc/des_crypt.h>
36#include <rpc/des.h>
37
38#ifndef lint
39/* from: static char sccsid[] = "@(#)des_crypt.c	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI"; */
40static const char rcsid[] = "$Id$";
41#endif
42
43static int common_crypt	__P(( char *, char *, register unsigned, unsigned, struct desparams * ));
44int (*__des_crypt_LOCAL)() = 0;
45extern _des_crypt_call __P(( char *, int, struct desparams * ));
46/*
47 * Copy 8 bytes
48 */
49#define COPY8(src, dst) { \
50	register char *a = (char *) dst; \
51	register char *b = (char *) src; \
52	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
53	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
54}
55
56/*
57 * Copy multiple of 8 bytes
58 */
59#define DESCOPY(src, dst, len) { \
60	register char *a = (char *) dst; \
61	register char *b = (char *) src; \
62	register int i; \
63	for (i = (int) len; i > 0; i -= 8) { \
64		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
65		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
66	} \
67}
68
69/*
70 * CBC mode encryption
71 */
72int
73cbc_crypt(key, buf, len, mode, ivec)
74	char *key;
75	char *buf;
76	unsigned len;
77	unsigned mode;
78	char *ivec;
79{
80	int err;
81	struct desparams dp;
82
83#ifdef BROKEN_DES
84	dp.UDES.UDES_buf = buf;
85	dp.des_mode = ECB;
86#else
87	dp.des_mode = CBC;
88#endif
89	COPY8(ivec, dp.des_ivec);
90	err = common_crypt(key, buf, len, mode, &dp);
91	COPY8(dp.des_ivec, ivec);
92	return(err);
93}
94
95
96/*
97 * ECB mode encryption
98 */
99int
100ecb_crypt(key, buf, len, mode)
101	char *key;
102	char *buf;
103	unsigned len;
104	unsigned mode;
105{
106	struct desparams dp;
107
108#ifdef BROKEN_DES
109	dp.UDES.UDES_buf = buf;
110	dp.des_mode = CBC;
111#else
112	dp.des_mode = ECB;
113#endif
114	return(common_crypt(key, buf, len, mode, &dp));
115}
116
117
118
119/*
120 * Common code to cbc_crypt() & ecb_crypt()
121 */
122static int
123common_crypt(key, buf, len, mode, desp)
124	char *key;
125	char *buf;
126	register unsigned len;
127	unsigned mode;
128	register struct desparams *desp;
129{
130	register int desdev;
131
132	if ((len % 8) != 0 || len > DES_MAXDATA) {
133		return(DESERR_BADPARAM);
134	}
135	desp->des_dir =
136		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
137
138	desdev = mode & DES_DEVMASK;
139	COPY8(key, desp->des_key);
140	/*
141	 * software
142	 */
143	if (__des_crypt_LOCAL != NULL) {
144		if (!__des_crypt_LOCAL(buf, len, desp)) {
145			return (DESERR_HWERROR);
146		}
147	} else {
148		if (!_des_crypt_call(buf, len, desp)) {
149			return (DESERR_HWERROR);
150		}
151	}
152	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
153}
154