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