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bf_cbc.c revision 1.1 
      1 /*	$NetBSD: bf_cbc.c,v 1.1 2000/06/14 19:45:33 thorpej Exp $	*/
      2 /*	$KAME: bf_cbc.c,v 1.3 2000/03/27 04:36:25 sumikawa Exp $	*/
      3 
      4 /* crypto/bf/bf_cbc.c */
      5 /* Copyright (C) 1995-1997 Eric Young (eay (at) mincom.oz.au)
      6  * All rights reserved.
      7  *
      8  * This package is an SSL implementation written
      9  * by Eric Young (eay (at) mincom.oz.au).
     10  * The implementation was written so as to conform with Netscapes SSL.
     11  *
     12  * This library is free for commercial and non-commercial use as long as
     13  * the following conditions are aheared to.  The following conditions
     14  * apply to all code found in this distribution, be it the RC4, RSA,
     15  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     16  * included with this distribution is covered by the same copyright terms
     17  * except that the holder is Tim Hudson (tjh (at) mincom.oz.au).
     18  *
     19  * Copyright remains Eric Young's, and as such any Copyright notices in
     20  * the code are not to be removed.
     21  * If this package is used in a product, Eric Young should be given attribution
     22  * as the author of the parts of the library used.
     23  * This can be in the form of a textual message at program startup or
     24  * in documentation (online or textual) provided with the package.
     25  *
     26  * Redistribution and use in source and binary forms, with or without
     27  * modification, are permitted provided that the following conditions
     28  * are met:
     29  * 1. Redistributions of source code must retain the copyright
     30  *    notice, this list of conditions and the following disclaimer.
     31  * 2. Redistributions in binary form must reproduce the above copyright
     32  *    notice, this list of conditions and the following disclaimer in the
     33  *    documentation and/or other materials provided with the distribution.
     34  * 3. All advertising materials mentioning features or use of this software
     35  *    must display the following acknowledgement:
     36  *    "This product includes cryptographic software written by
     37  *     Eric Young (eay (at) mincom.oz.au)"
     38  *    The word 'cryptographic' can be left out if the rouines from the library
     39  *    being used are not cryptographic related :-).
     40  * 4. If you include any Windows specific code (or a derivative thereof) from
     41  *    the apps directory (application code) you must include an acknowledgement:
     42  *    "This product includes software written by Tim Hudson (tjh (at) mincom.oz.au)"
     43  *
     44  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     54  * SUCH DAMAGE.
     55  *
     56  * The licence and distribution terms for any publically available version or
     57  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     58  * copied and put under another distribution licence
     59  * [including the GNU Public Licence.]
     60  */
     61 
     62 #include <crypto/blowfish/blowfish.h>
     63 #include <crypto/blowfish/bf_locl.h>
     64 
     65 void BF_cbc_encrypt(in, out, length, ks, iv, encrypt)
     66 unsigned char *in;
     67 unsigned char *out;
     68 long length;
     69 BF_KEY *ks;
     70 unsigned char *iv;
     71 int encrypt;
     72 	{
     73 	register BF_LONG tin0,tin1;
     74 	register BF_LONG tout0,tout1,xor0,xor1;
     75 	register long l=length;
     76 	BF_LONG tin[2];
     77 
     78 	if (encrypt)
     79 		{
     80 		n2l(iv,tout0);
     81 		n2l(iv,tout1);
     82 		iv-=8;
     83 		for (l-=8; l>=0; l-=8)
     84 			{
     85 			n2l(in,tin0);
     86 			n2l(in,tin1);
     87 			tin0^=tout0;
     88 			tin1^=tout1;
     89 			tin[0]=tin0;
     90 			tin[1]=tin1;
     91 			BF_encrypt(tin,ks,BF_ENCRYPT);
     92 			tout0=tin[0];
     93 			tout1=tin[1];
     94 			l2n(tout0,out);
     95 			l2n(tout1,out);
     96 			}
     97 		if (l != -8)
     98 			{
     99 			n2ln(in,tin0,tin1,l+8);
    100 			tin0^=tout0;
    101 			tin1^=tout1;
    102 			tin[0]=tin0;
    103 			tin[1]=tin1;
    104 			BF_encrypt(tin,ks,BF_ENCRYPT);
    105 			tout0=tin[0];
    106 			tout1=tin[1];
    107 			l2n(tout0,out);
    108 			l2n(tout1,out);
    109 			}
    110 		l2n(tout0,iv);
    111 		l2n(tout1,iv);
    112 		}
    113 	else
    114 		{
    115 		n2l(iv,xor0);
    116 		n2l(iv,xor1);
    117 		iv-=8;
    118 		for (l-=8; l>=0; l-=8)
    119 			{
    120 			n2l(in,tin0);
    121 			n2l(in,tin1);
    122 			tin[0]=tin0;
    123 			tin[1]=tin1;
    124 			BF_encrypt(tin,ks,BF_DECRYPT);
    125 			tout0=tin[0]^xor0;
    126 			tout1=tin[1]^xor1;
    127 			l2n(tout0,out);
    128 			l2n(tout1,out);
    129 			xor0=tin0;
    130 			xor1=tin1;
    131 			}
    132 		if (l != -8)
    133 			{
    134 			n2l(in,tin0);
    135 			n2l(in,tin1);
    136 			tin[0]=tin0;
    137 			tin[1]=tin1;
    138 			BF_encrypt(tin,ks,BF_DECRYPT);
    139 			tout0=tin[0]^xor0;
    140 			tout1=tin[1]^xor1;
    141 			l2nn(tout0,tout1,out,l+8);
    142 			xor0=tin0;
    143 			xor1=tin1;
    144 			}
    145 		l2n(xor0,iv);
    146 		l2n(xor1,iv);
    147 		}
    148 	tin0=tin1=tout0=tout1=xor0=xor1=0;
    149 	tin[0]=tin[1]=0;
    150 	}
    151 
    152