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
39static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
40int (*__des_crypt_LOCAL)(char *, unsigned, struct desparams *) = 0;
41extern int _des_crypt_call(char *, int, struct desparams *);
42/*
43 * Copy 8 bytes
44 */
45#define COPY8(src, dst) { \
46	char *a = (char *) dst; \
47	char *b = (char *) src; \
48	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
49	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
50}
51
52/*
53 * Copy multiple of 8 bytes
54 */
55#define DESCOPY(src, dst, len) { \
56	char *a = (char *) dst; \
57	char *b = (char *) src; \
58	int i; \
59	for (i = (int) len; i > 0; i -= 8) { \
60		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
61		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
62	} \
63}
64
65/*
66 * CBC mode encryption
67 */
68int
69cbc_crypt(char *key, char *buf, unsigned len, unsigned mode, char *ivec)
70{
71	int err;
72	struct desparams dp;
73
74#ifdef BROKEN_DES
75	dp.UDES.UDES_buf = buf;
76	dp.des_mode = ECB;
77#else
78	dp.des_mode = CBC;
79#endif
80	COPY8(ivec, dp.des_ivec);
81	err = common_crypt(key, buf, len, mode, &dp);
82	COPY8(dp.des_ivec, ivec);
83	return(err);
84}
85
86
87/*
88 * ECB mode encryption
89 */
90int
91ecb_crypt(char *key, char *buf, unsigned len, unsigned mode)
92{
93	struct desparams dp;
94
95#ifdef BROKEN_DES
96	dp.UDES.UDES_buf = buf;
97	dp.des_mode = CBC;
98#else
99	dp.des_mode = ECB;
100#endif
101	return(common_crypt(key, buf, len, mode, &dp));
102}
103
104
105
106/*
107 * Common code to cbc_crypt() & ecb_crypt()
108 */
109static int
110common_crypt(char *key, char *buf, unsigned len, unsigned mode,
111    struct desparams *desp)
112{
113	int desdev;
114
115	if ((len % 8) != 0 || len > DES_MAXDATA) {
116		return(DESERR_BADPARAM);
117	}
118	desp->des_dir =
119		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
120
121	desdev = mode & DES_DEVMASK;
122	COPY8(key, desp->des_key);
123	/*
124	 * software
125	 */
126	if (__des_crypt_LOCAL != NULL) {
127		if (!__des_crypt_LOCAL(buf, len, desp)) {
128			return (DESERR_HWERROR);
129		}
130	} else {
131		if (!_des_crypt_call(buf, len, desp)) {
132			return (DESERR_HWERROR);
133		}
134	}
135	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
136}
137