crypto/evp/e_xcbc_d.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include "internal/cryptlib.h"
  60
  61 #ifndef OPENSSL_NO_DES
  62
  63 # include <openssl/evp.h>
  64 # include <openssl/objects.h>
  65 # include "internal/evp_int.h"
  66 # include <openssl/des.h>
  67
  68 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  69                              const unsigned char *iv, int enc);
  70 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  71                            const unsigned char *in, size_t inl);
  72
  73 typedef struct {
  74     DES_key_schedule ks;        /* key schedule */
  75     DES_cblock inw;
  76     DES_cblock outw;
  77 } DESX_CBC_KEY;
  78
  79 # define data(ctx) EVP_C_DATA(DESX_CBC_KEY,ctx)
  80
  81 static const EVP_CIPHER d_xcbc_cipher = {
  82     NID_desx_cbc,
  83     8, 24, 8,
  84     EVP_CIPH_CBC_MODE,
  85     desx_cbc_init_key,
  86     desx_cbc_cipher,
  87     NULL,
  88     sizeof(DESX_CBC_KEY),
  89     EVP_CIPHER_set_asn1_iv,
  90     EVP_CIPHER_get_asn1_iv,
  91     NULL,
  92     NULL
  93 };
  94
  95 const EVP_CIPHER *EVP_desx_cbc(void)
  96 {
  97     return (&d_xcbc_cipher);
  98 }
  99
 100 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 101                              const unsigned char *iv, int enc)
 102 {
 103     DES_cblock *deskey = (DES_cblock *)key;
 104
 105     DES_set_key_unchecked(deskey, &data(ctx)->ks);
 106     memcpy(&data(ctx)->inw[0], &key[8], 8);
 107     memcpy(&data(ctx)->outw[0], &key[16], 8);
 108
 109     return 1;
 110 }
 111
 112 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 113                            const unsigned char *in, size_t inl)
 114 {
 115     while (inl >= EVP_MAXCHUNK) {
 116         DES_xcbc_encrypt(in, out, (long)EVP_MAXCHUNK, &data(ctx)->ks,
 117                          (DES_cblock *)EVP_CIPHER_CTX_iv_noconst(ctx),
 118                          &data(ctx)->inw, &data(ctx)->outw,
 119                          EVP_CIPHER_CTX_encrypting(ctx));
 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 *)EVP_CIPHER_CTX_iv_noconst(ctx),
 127                          &data(ctx)->inw, &data(ctx)->outw,
 128                          EVP_CIPHER_CTX_encrypting(ctx));
 129     return 1;
 130 }
 131 #endif