des_crypt.c revision 136581 
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#if defined(LIBC_SCCS) && !defined(lint)
39static char sccsid[] = "@(#)des_crypt.c	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/lib/libc/rpc/des_crypt.c 136581 2004-10-16 06:11:35Z obrien $");
43
44static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
45int (*__des_crypt_LOCAL)() = 0;
46extern int _des_crypt_call(char *, int, struct desparams *);
47/*
48 * Copy 8 bytes
49 */
50#define COPY8(src, dst) { \
51	char *a = (char *) dst; \
52	char *b = (char *) src; \
53	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
54	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
55}
56
57/*
58 * Copy multiple of 8 bytes
59 */
60#define DESCOPY(src, dst, len) { \
61	char *a = (char *) dst; \
62	char *b = (char *) src; \
63	int i; \
64	for (i = (int) len; i > 0; i -= 8) { \
65		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
66		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
67	} \
68}
69
70/*
71 * CBC mode encryption
72 */
73int
74cbc_crypt(key, buf, len, mode, ivec)
75	char *key;
76	char *buf;
77	unsigned len;
78	unsigned mode;
79	char *ivec;
80{
81	int err;
82	struct desparams dp;
83
84#ifdef BROKEN_DES
85	dp.UDES.UDES_buf = buf;
86	dp.des_mode = ECB;
87#else
88	dp.des_mode = CBC;
89#endif
90	COPY8(ivec, dp.des_ivec);
91	err = common_crypt(key, buf, len, mode, &dp);
92	COPY8(dp.des_ivec, ivec);
93	return(err);
94}
95
96
97/*
98 * ECB mode encryption
99 */
100int
101ecb_crypt(key, buf, len, mode)
102	char *key;
103	char *buf;
104	unsigned len;
105	unsigned mode;
106{
107	struct desparams dp;
108
109#ifdef BROKEN_DES
110	dp.UDES.UDES_buf = buf;
111	dp.des_mode = CBC;
112#else
113	dp.des_mode = ECB;
114#endif
115	return(common_crypt(key, buf, len, mode, &dp));
116}
117
118
119
120/*
121 * Common code to cbc_crypt() & ecb_crypt()
122 */
123static int
124common_crypt(key, buf, len, mode, desp)
125	char *key;
126	char *buf;
127	unsigned len;
128	unsigned mode;
129	struct desparams *desp;
130{
131	int desdev;
132
133	if ((len % 8) != 0 || len > DES_MAXDATA) {
134		return(DESERR_BADPARAM);
135	}
136	desp->des_dir =
137		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
138
139	desdev = mode & DES_DEVMASK;
140	COPY8(key, desp->des_key);
141	/*
142	 * software
143	 */
144	if (__des_crypt_LOCAL != NULL) {
145		if (!__des_crypt_LOCAL(buf, len, desp)) {
146			return (DESERR_HWERROR);
147		}
148	} else {
149		if (!_des_crypt_call(buf, len, desp)) {
150			return (DESERR_HWERROR);
151		}
152	}
153	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
154}
155