e_xcbc_d.c revision 296465 
1/* crypto/evp/e_xcbc_d.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 <stdio.h>
60#include "cryptlib.h"
61
62#ifndef OPENSSL_NO_DES
63
64# include <openssl/evp.h>
65# include <openssl/objects.h>
66# include <openssl/des.h>
67
68static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
69                             const unsigned char *iv, int enc);
70static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
71                           const unsigned char *in, unsigned int inl);
72
73typedef struct {
74    DES_key_schedule ks;        /* key schedule */
75    DES_cblock inw;
76    DES_cblock outw;
77} DESX_CBC_KEY;
78
79# define data(ctx) ((DESX_CBC_KEY *)(ctx)->cipher_data)
80
81static const EVP_CIPHER d_xcbc_cipher = {
82    NID_desx_cbc,
83    8, 24, 8,
84    EVP_CIPH_CBC_MODE,
85    desx_cbc_init_key,
86    desx_cbc_cipher,
87    NULL,
88    sizeof(DESX_CBC_KEY),
89    EVP_CIPHER_set_asn1_iv,
90    EVP_CIPHER_get_asn1_iv,
91    NULL,
92    NULL
93};
94
95const EVP_CIPHER *EVP_desx_cbc(void)
96{
97    return (&d_xcbc_cipher);
98}
99
100static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
101                             const unsigned char *iv, int enc)
102{
103    DES_cblock *deskey = (DES_cblock *)key;
104
105    DES_set_key_unchecked(deskey, &data(ctx)->ks);
106    memcpy(&data(ctx)->inw[0], &key[8], 8);
107    memcpy(&data(ctx)->outw[0], &key[16], 8);
108
109    return 1;
110}
111
112static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
113                           const unsigned char *in, unsigned int inl)
114{
115    DES_xcbc_encrypt(in, out, inl, &data(ctx)->ks,
116                     (DES_cblock *)&(ctx->iv[0]),
117                     &data(ctx)->inw, &data(ctx)->outw, ctx->encrypt);
118    return 1;
119}
120#endif
121