des_crypt.c revision 92990 
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 0
39#ifndef 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#endif
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: head/lib/libc/rpc/des_crypt.c 92990 2002-03-22 23:18:37Z obrien $");
45
46static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );
47int (*__des_crypt_LOCAL)() = 0;
48extern int _des_crypt_call(char *, int, struct desparams *);
49/*
50 * Copy 8 bytes
51 */
52#define COPY8(src, dst) { \
53	char *a = (char *) dst; \
54	char *b = (char *) src; \
55	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
56	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
57}
58
59/*
60 * Copy multiple of 8 bytes
61 */
62#define DESCOPY(src, dst, len) { \
63	char *a = (char *) dst; \
64	char *b = (char *) src; \
65	int i; \
66	for (i = (int) len; i > 0; i -= 8) { \
67		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
68		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
69	} \
70}
71
72/*
73 * CBC mode encryption
74 */
75int
76cbc_crypt(key, buf, len, mode, ivec)
77	char *key;
78	char *buf;
79	unsigned len;
80	unsigned mode;
81	char *ivec;
82{
83	int err;
84	struct desparams dp;
85
86#ifdef BROKEN_DES
87	dp.UDES.UDES_buf = buf;
88	dp.des_mode = ECB;
89#else
90	dp.des_mode = CBC;
91#endif
92	COPY8(ivec, dp.des_ivec);
93	err = common_crypt(key, buf, len, mode, &dp);
94	COPY8(dp.des_ivec, ivec);
95	return(err);
96}
97
98
99/*
100 * ECB mode encryption
101 */
102int
103ecb_crypt(key, buf, len, mode)
104	char *key;
105	char *buf;
106	unsigned len;
107	unsigned mode;
108{
109	struct desparams dp;
110
111#ifdef BROKEN_DES
112	dp.UDES.UDES_buf = buf;
113	dp.des_mode = CBC;
114#else
115	dp.des_mode = ECB;
116#endif
117	return(common_crypt(key, buf, len, mode, &dp));
118}
119
120
121
122/*
123 * Common code to cbc_crypt() & ecb_crypt()
124 */
125static int
126common_crypt(key, buf, len, mode, desp)
127	char *key;
128	char *buf;
129	unsigned len;
130	unsigned mode;
131	struct desparams *desp;
132{
133	int desdev;
134
135	if ((len % 8) != 0 || len > DES_MAXDATA) {
136		return(DESERR_BADPARAM);
137	}
138	desp->des_dir =
139		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;
140
141	desdev = mode & DES_DEVMASK;
142	COPY8(key, desp->des_key);
143	/*
144	 * software
145	 */
146	if (__des_crypt_LOCAL != NULL) {
147		if (!__des_crypt_LOCAL(buf, len, desp)) {
148			return (DESERR_HWERROR);
149		}
150	} else {
151		if (!_des_crypt_call(buf, len, desp)) {
152			return (DESERR_HWERROR);
153		}
154	}
155	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
156}
157