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1/* $OpenBSD: e_xcbc_d.c,v 1.12 2014/07/11 08:44:48 jsing Exp $ */
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 <string.h>
61
62#include <openssl/opensslconf.h>
63
64#ifndef OPENSSL_NO_DES
65
66#include <openssl/des.h>
67#include <openssl/evp.h>
68#include <openssl/objects.h>
69
70#include "evp_locl.h"
71
72static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
73 const unsigned char *iv, int enc);
74static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
75 const unsigned char *in, size_t inl);
76
77
78typedef struct {
79 DES_key_schedule ks;/* key schedule */
80 DES_cblock inw;
81 DES_cblock outw;
82} DESX_CBC_KEY;
83
84#define data(ctx) ((DESX_CBC_KEY *)(ctx)->cipher_data)
85
86static const EVP_CIPHER d_xcbc_cipher = {
87 NID_desx_cbc,
88 8, 24, 8,
89 EVP_CIPH_CBC_MODE,
90 desx_cbc_init_key,
91 desx_cbc_cipher,
92 NULL,
93 sizeof(DESX_CBC_KEY),
94 EVP_CIPHER_set_asn1_iv,
95 EVP_CIPHER_get_asn1_iv,
96 NULL,
97 NULL
98};
99
100const EVP_CIPHER *
101EVP_desx_cbc(void)
102{
103 return (&d_xcbc_cipher);
104}
105
106static int
107desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
108 const unsigned char *iv, int enc)
109{
110 DES_cblock *deskey = (DES_cblock *)key;
111
112 DES_set_key_unchecked(deskey, &data(ctx)->ks);
113 memcpy(&data(ctx)->inw[0], &key[8], 8);
114 memcpy(&data(ctx)->outw[0], &key[16], 8);
115
116 return 1;
117}
118
119static int
120desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
121 const unsigned char *in, size_t inl)
122{
123 while (inl >= EVP_MAXCHUNK) {
124 DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
125 (DES_cblock *)&(ctx->iv[0]), &data(ctx)->inw,
126 &data(ctx)->outw, ctx->encrypt);
127 inl -= EVP_MAXCHUNK;
128 in += EVP_MAXCHUNK;
129 out += EVP_MAXCHUNK;
130 }
131 if (inl)
132 DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
133 (DES_cblock *)&(ctx->iv[0]), &data(ctx)->inw,
134 &data(ctx)->outw, ctx->encrypt);
135 return 1;
136}
137#endif