1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30/*
31 * des_crypt.c, DES encryption library routines
32 * Copyright (C) 1986, Sun Microsystems, Inc.
33 */
34
35#include <sys/types.h>
36#include <rpc/des_crypt.h>
37#include <rpc/des.h>
38
39#if defined(LIBC_SCCS) && !defined(lint)
40static char sccsid[] = "@(#)des_crypt.c	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";
41#endif
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD$");
44
45static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
46int (*__des_crypt_LOCAL)(char *, unsigned, struct desparams *) = 0;
47extern int _des_crypt_call(char *, int, struct desparams *);
48/*
49 * Copy 8 bytes
50 */
51#define COPY8(src, dst) { \
52	char *a = (char *) dst; \
53	char *b = (char *) src; \
54	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
55	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
56}
57
58/*
59 * Copy multiple of 8 bytes
60 */
61#define DESCOPY(src, dst, len) { \
62	char *a = (char *) dst; \
63	char *b = (char *) src; \
64	int i; \
65	for (i = (int) len; i > 0; i -= 8) { \
66		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
67		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
68	} \
69}
70
71/*
72 * CBC mode encryption
73 */
74int
75cbc_crypt(char *key, char *buf, unsigned len, unsigned mode, char *ivec)
76{
77	int err;
78	struct desparams dp;
79
80#ifdef BROKEN_DES
81	dp.UDES.UDES_buf = buf;
82	dp.des_mode = ECB;
83#else
84	dp.des_mode = CBC;
85#endif
86	COPY8(ivec, dp.des_ivec);
87	err = common_crypt(key, buf, len, mode, &dp);
88	COPY8(dp.des_ivec, ivec);
89	return(err);
90}
91
92
93/*
94 * ECB mode encryption
95 */
96int
97ecb_crypt(char *key, char *buf, unsigned len, unsigned mode)
98{
99	struct desparams dp;
100
101#ifdef BROKEN_DES
102	dp.UDES.UDES_buf = buf;
103	dp.des_mode = CBC;
104#else
105	dp.des_mode = ECB;
106#endif
107	return(common_crypt(key, buf, len, mode, &dp));
108}
109
110
111
112/*
113 * Common code to cbc_crypt() & ecb_crypt()
114 */
115static int
116common_crypt(char *key, char *buf, unsigned len, unsigned mode,
117    struct desparams *desp)
118{
119	int desdev;
120
121	if ((len % 8) != 0 || len > DES_MAXDATA) {
122		return(DESERR_BADPARAM);
123	}
124	desp->des_dir =
125		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
126
127	desdev = mode & DES_DEVMASK;
128	COPY8(key, desp->des_key);
129	/*
130	 * software
131	 */
132	if (__des_crypt_LOCAL != NULL) {
133		if (!__des_crypt_LOCAL(buf, len, desp)) {
134			return (DESERR_HWERROR);
135		}
136	} else {
137		if (!_des_crypt_call(buf, len, desp)) {
138			return (DESERR_HWERROR);
139		}
140	}
141	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
142}
143