crypto/evp/e_xcbc_d.c

   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 const EVP_CIPHER *EVP_desx_cbc(void)
  97 {
  98     return (&d_xcbc_cipher);
  99 }
 100
 101 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     DES_set_key_unchecked(deskey, &data(ctx)->ks);
 107     memcpy(&data(ctx)->inw[0], &key[8], 8);
 108     memcpy(&data(ctx)->outw[0], &key[16], 8);
 109
 110     return 1;
 111 }
 112
 113 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 114                            const unsigned char *in, size_t inl)
 115 {
 116     while (inl >= EVP_MAXCHUNK) {
 117         DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
 118                          (DES_cblock *)&(ctx->iv[0]),
 119                          &data(ctx)->inw, &data(ctx)->outw, ctx->encrypt);
 120         inl -= EVP_MAXCHUNK;
 121         in += EVP_MAXCHUNK;
 122         out += EVP_MAXCHUNK;
 123     }
 124     if (inl)
 125         DES_xcbc_encrypt(in, out, (long)inl, &data(ctx)->ks,
 126                          (DES_cblock *)&(ctx->iv[0]),
 127                          &data(ctx)->inw, &data(ctx)->outw, ctx->encrypt);
 128     return 1;
 129 }
 130 #endif