crypto/evp/e_ofb_r2.c

   1 /* crypto/evp/e_ofb_r2.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 #ifndef NO_RC2
  60
  61 #include <stdio.h>
  62 #include "cryptlib.h"
  63 #include <openssl/evp.h>
  64 #include <openssl/objects.h>
  65
  66 #ifndef NOPROTO
  67 static void rc2_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
  68         unsigned char *iv,int enc);
  69 static void rc2_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  70         unsigned char *in, unsigned int inl);
  71 #else
  72 static void rc2_ofb_init_key();
  73 static void rc2_ofb_cipher();
  74 #endif
  75
  76 static EVP_CIPHER r2_ofb_cipher=
  77         {
  78         NID_rc2_ofb64,
  79         1,EVP_RC2_KEY_SIZE,8,
  80         rc2_ofb_init_key,
  81         rc2_ofb_cipher,
  82         NULL,
  83         sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+
  84                 sizeof((((EVP_CIPHER_CTX *)NULL)->c.rc2_ks)),
  85         EVP_CIPHER_set_asn1_iv,
  86         EVP_CIPHER_get_asn1_iv,
  87         };
  88
  89 EVP_CIPHER *EVP_rc2_ofb(void)
  90         {
  91         return(&r2_ofb_cipher);
  92         }
  93
  94 static void rc2_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
  95              unsigned char *iv, int enc)
  96         {
  97         ctx->num=0;
  98
  99         if (iv != NULL)
 100                 memcpy(&(ctx->oiv[0]),iv,8);
 101         memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
 102         if (key != NULL)
 103                 RC2_set_key(&(ctx->c.rc2_ks),EVP_CIPHER_CTX_key_length(ctx),
 104                         key,EVP_CIPHER_CTX_key_length(ctx)*8);
 105         }
 106
 107 static void rc2_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 108              unsigned char *in, unsigned int inl)
 109         {
 110         RC2_ofb64_encrypt(
 111                 in,out,
 112                 (long)inl, &(ctx->c.rc2_ks),
 113                 &(ctx->iv[0]),
 114                 &ctx->num);
 115         }
 116
 117 #endif