des_crypt.c revision 261046 
1/*-
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 *   this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 *   this list of conditions and the following disclaimer in the documentation
11 *   and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 *   contributors may be used to endorse or promote products derived
14 *   from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28/*
29 * des_crypt.c, DES encryption library routines
30 * Copyright (C) 1986, Sun Microsystems, Inc.
31 */
32
33#include <sys/types.h>
34#include <rpc/des_crypt.h>
35#include <rpc/des.h>
36
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "@(#)des_crypt.c	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";
39#endif
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD: stable/10/lib/libc/rpc/des_crypt.c 261046 2014-01-22 23:45:27Z mav $");
42
43static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
44int (*__des_crypt_LOCAL)() = 0;
45extern int _des_crypt_call(char *, int, struct desparams *);
46/*
47 * Copy 8 bytes
48 */
49#define COPY8(src, dst) { \
50	char *a = (char *) dst; \
51	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	char *a = (char *) dst; \
61	char *b = (char *) src; \
62	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	unsigned len;
127	unsigned mode;
128	struct desparams *desp;
129{
130	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