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 <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, unsigned int inl);

    72 

    73 

    74 typedef struct

    75     {

    76     DES_key_schedule ks;/* key schedule */

    77     DES_cblock inw;

    78     DES_cblock outw;

    79     } DESX_CBC_KEY;

    80 

    81 #define data(ctx) ((DESX_CBC_KEY *)(ctx)->cipher_data)

    82 

    83 static const EVP_CIPHER d_xcbc_cipher=

    84 	{

    85 	NID_desx_cbc,

    86 	8,24,8,

    87 	EVP_CIPH_CBC_MODE,

    88 	desx_cbc_init_key,

    89 	desx_cbc_cipher,

    90 	NULL,

    91 	sizeof(DESX_CBC_KEY),

    92 	EVP_CIPHER_set_asn1_iv,

    93 	EVP_CIPHER_get_asn1_iv,

    94 	NULL,

    95 	NULL

    96 	};

    97 

    98 EXPORT_C const EVP_CIPHER *EVP_desx_cbc(void)

    99 	{

   100 	return(&d_xcbc_cipher);

   101 	}

   102 	

   103 static int desx_cbc_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

   104 			     const unsigned char *iv, int enc)

   105 	{

   106 	DES_cblock *deskey = (DES_cblock *)key;

   107 

   108 	DES_set_key_unchecked(deskey,&data(ctx)->ks);

   109 	memcpy(&data(ctx)->inw[0],&key[8],8);

   110 	memcpy(&data(ctx)->outw[0],&key[16],8);

   111 

   112 	return 1;

   113 	}

   114 

   115 static int desx_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

   116 			   const unsigned char *in, unsigned int inl)

   117 	{

   118 	DES_xcbc_encrypt(in,out,inl,&data(ctx)->ks,

   119 			 (DES_cblock *)&(ctx->iv[0]),

   120 			 &data(ctx)->inw,

   121 			 &data(ctx)->outw,

   122 			 ctx->encrypt);

   123 	return 1;

   124 	}

   125 #endif