crypto/evp/e_ofb_3d.c

   1 /* crypto/evp/e_ofb_3d.c */
   2 /* Copyright (C) 1995-1997 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 #include "evp.h"
  62 #include "objects.h"
  63
  64 #ifndef NOPROTO
  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 #else
  72 static void des_ede_ofb_init_key();
  73 static void des_ede3_ofb_init_key();
  74 static void des_ede_ofb_cipher();
  75 #endif
  76
  77 static EVP_CIPHER d_ede_ofb_cipher2=
  78         {
  79         NID_des_ede_ofb64,
  80         1,16,8,
  81         des_ede_ofb_init_key,
  82         des_ede_ofb_cipher,
  83         };
  84
  85 static EVP_CIPHER d_ede3_ofb_cipher3=
  86         {
  87         NID_des_ede3_ofb64,
  88         1,24,8,
  89         des_ede3_ofb_init_key,
  90         des_ede_ofb_cipher,
  91         };
  92
  93 EVP_CIPHER *EVP_des_ede_ofb()
  94         {
  95         return(&d_ede_ofb_cipher2);
  96         }
  97
  98 EVP_CIPHER *EVP_des_ede3_ofb()
  99         {
 100         return(&d_ede3_ofb_cipher3);
 101         }
 102
 103 static void des_ede_ofb_init_key(ctx,key,iv,enc)
 104 EVP_CIPHER_CTX *ctx;
 105 unsigned char *key;
 106 unsigned char *iv;
 107 int enc;
 108         {
 109         ctx->c.des_cfb.num=0;
 110
 111         if (iv != NULL)
 112                 memcpy(&(ctx->c.des_cfb.oiv[0]),iv,8);
 113         memcpy(&(ctx->c.des_cfb.iv[0]),&(ctx->c.des_cfb.oiv[0]),8);
 114         if (key != NULL)
 115                 {
 116                 des_set_key((des_cblock *)key,ctx->c.des_cfb.ks);
 117                 des_set_key((des_cblock *)&(key[8]),ctx->c.des_cfb.ks2);
 118                 memcpy( (char *)ctx->c.des_cfb.ks3,
 119                         (char *)ctx->c.des_cfb.ks,
 120                         sizeof(ctx->c.des_cfb.ks));
 121                 }
 122         }
 123
 124 static void des_ede3_ofb_init_key(ctx,key,iv,enc)
 125 EVP_CIPHER_CTX *ctx;
 126 unsigned char *key;
 127 unsigned char *iv;
 128 int enc;
 129         {
 130         ctx->c.des_cfb.num=0;
 131
 132         if (iv != NULL)
 133                 memcpy(&(ctx->c.des_cfb.oiv[0]),iv,8);
 134         memcpy(&(ctx->c.des_cfb.iv[0]),&(ctx->c.des_cfb.oiv[0]),8);
 135         if (key != NULL)
 136                 {
 137                 des_set_key((des_cblock *)key,ctx->c.des_cfb.ks);
 138                 des_set_key((des_cblock *)&(key[8]),ctx->c.des_cfb.ks2);
 139                 des_set_key((des_cblock *)&(key[16]),ctx->c.des_cfb.ks3);
 140                 }
 141         }
 142
 143 static void des_ede_ofb_cipher(ctx,out,in,inl)
 144 EVP_CIPHER_CTX *ctx;
 145 unsigned char *out;
 146 unsigned char *in;
 147 unsigned int inl;
 148         {
 149         des_ede3_ofb64_encrypt(
 150                 in,out,
 151                 (long)inl,
 152                 ctx->c.des_cfb.ks, ctx->c.des_cfb.ks2, ctx->c.des_cfb.ks3,
 153                 (des_cblock *)&(ctx->c.des_cfb.iv[0]),
 154                 &ctx->c.des_cfb.num);
 155         }