rpc_enc.c revision 296465 
1/* crypto/des/rpc_enc.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include "rpc_des.h"
60#include "des_locl.h"
61#include "des_ver.h"
62
63int _des_crypt(char *buf, int len, struct desparams *desp);
64int _des_crypt(char *buf, int len, struct desparams *desp)
65{
66    DES_key_schedule ks;
67    int enc;
68
69    DES_set_key_unchecked(&desp->des_key, &ks);
70    enc = (desp->des_dir == ENCRYPT) ? DES_ENCRYPT : DES_DECRYPT;
71
72    if (desp->des_mode == CBC)
73        DES_ecb_encrypt((const_DES_cblock *)desp->UDES.UDES_buf,
74                        (DES_cblock *)desp->UDES.UDES_buf, &ks, enc);
75    else {
76        DES_ncbc_encrypt(desp->UDES.UDES_buf, desp->UDES.UDES_buf,
77                         len, &ks, &desp->des_ivec, enc);
78#ifdef undef
79        /*
80         * len will always be %8 if called from common_crypt in secure_rpc.
81         * Libdes's cbc encrypt does not copy back the iv, so we have to do
82         * it here.
83         */
84        /* It does now :-) eay 20/09/95 */
85
86        a = (char *)&(desp->UDES.UDES_buf[len - 8]);
87        b = (char *)&(desp->des_ivec[0]);
88
89        *(a++) = *(b++);
90        *(a++) = *(b++);
91        *(a++) = *(b++);
92        *(a++) = *(b++);
93        *(a++) = *(b++);
94        *(a++) = *(b++);
95        *(a++) = *(b++);
96        *(a++) = *(b++);
97#endif
98    }
99    return (1);
100}
101