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.]
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);
72 static void des_ede_ofb_init_key();
73 static void des_ede3_ofb_init_key();
74 static void des_ede_ofb_cipher();
77 static EVP_CIPHER d_ede_ofb_cipher2=
84 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
85 sizeof((((EVP_CIPHER_CTX *)NULL)->c.des_ede)),
86 EVP_CIPHER_set_asn1_iv,
87 EVP_CIPHER_get_asn1_iv,
90 static EVP_CIPHER d_ede3_ofb_cipher3=
94 des_ede3_ofb_init_key,
97 sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
98 sizeof((((EVP_CIPHER_CTX *)NULL)->c.des_ede)),
99 EVP_CIPHER_set_asn1_iv,
100 EVP_CIPHER_get_asn1_iv,
103 EVP_CIPHER *EVP_des_ede_ofb()
105 return(&d_ede_ofb_cipher2);
108 EVP_CIPHER *EVP_des_ede3_ofb()
110 return(&d_ede3_ofb_cipher3);
113 static void des_ede_ofb_init_key(ctx,key,iv,enc)
122 memcpy(&(ctx->oiv[0]),iv,8);
123 memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
126 des_set_key(key,ctx->c.des_ede.ks1);
127 des_set_key(&(key[8]),ctx->c.des_ede.ks2);
128 memcpy( (char *)ctx->c.des_ede.ks3,
129 (char *)ctx->c.des_ede.ks1,
130 sizeof(ctx->c.des_ede.ks1));
134 static void des_ede3_ofb_init_key(ctx,key,iv,enc)
143 memcpy(&(ctx->oiv[0]),iv,8);
144 memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
147 des_set_key(key,ctx->c.des_ede.ks1);
148 des_set_key(&(key[8]),ctx->c.des_ede.ks2);
149 des_set_key(&(key[16]),ctx->c.des_ede.ks3);
153 static void des_ede_ofb_cipher(ctx,out,in,inl)
159 des_ede3_ofb64_encrypt(in,out,inl,ctx->c.des_ede.ks1,
160 ctx->c.des_ede.ks2, ctx->c.des_ede.ks3,
161 &(ctx->iv[0]),&ctx->num);