1 /* crypto/evp/e_ofb_3d.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
62 #include <openssl/evp.h>
63 #include <openssl/objects.h>
65 static void des_ede_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
66 unsigned char *iv,int enc);
67 static void des_ede3_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
68 unsigned char *iv,int enc);
69 static void des_ede_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
70 unsigned char *in, unsigned int inl);
71 static EVP_CIPHER d_ede_ofb_cipher2=
78 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
79 sizeof((((EVP_CIPHER_CTX *)NULL)->c.des_ede)),
80 EVP_CIPHER_set_asn1_iv,
81 EVP_CIPHER_get_asn1_iv,
84 static EVP_CIPHER d_ede3_ofb_cipher3=
88 des_ede3_ofb_init_key,
91 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
92 sizeof((((EVP_CIPHER_CTX *)NULL)->c.des_ede)),
93 EVP_CIPHER_set_asn1_iv,
94 EVP_CIPHER_get_asn1_iv,
97 EVP_CIPHER *EVP_des_ede_ofb(void)
99 return(&d_ede_ofb_cipher2);
102 EVP_CIPHER *EVP_des_ede3_ofb(void)
104 return(&d_ede3_ofb_cipher3);
107 static void des_ede_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
108 unsigned char *iv, int enc)
110 des_cblock *deskey = (des_cblock *)key;
115 memcpy(&(ctx->oiv[0]),iv,8);
116 memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
119 des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
120 des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
121 memcpy( (char *)ctx->c.des_ede.ks3,
122 (char *)ctx->c.des_ede.ks1,
123 sizeof(ctx->c.des_ede.ks1));
127 static void des_ede3_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
128 unsigned char *iv, int enc)
130 des_cblock *deskey = (des_cblock *)key;
135 memcpy(&(ctx->oiv[0]),iv,8);
136 memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
139 des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
140 des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
141 des_set_key_unchecked(&deskey[2],ctx->c.des_ede.ks3);
145 static void des_ede_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
146 unsigned char *in, unsigned int inl)
148 des_ede3_ofb64_encrypt(in,out,inl,ctx->c.des_ede.ks1,
149 ctx->c.des_ede.ks2, ctx->c.des_ede.ks3,
150 (des_cblock *)&(ctx->iv[0]),&ctx->num);