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