cbc3_enc.c revision 55714 
12490Sjkh/* crypto/des/cbc3_enc.c */
22490Sjkh/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
32490Sjkh * All rights reserved.
42490Sjkh *
52490Sjkh * This package is an SSL implementation written
62490Sjkh * 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 "des_locl.h"
60
61/* HAS BUGS? DON'T USE - this is only present for use in des.c */
62void des_3cbc_encrypt(des_cblock *input, des_cblock *output, long length,
63	     des_key_schedule ks1, des_key_schedule ks2, des_cblock *iv1,
64	     des_cblock *iv2, int enc)
65	{
66	int off=((int)length-1)/8;
67	long l8=((length+7)/8)*8;
68	des_cblock niv1,niv2;
69
70	if (enc == DES_ENCRYPT)
71		{
72		des_cbc_encrypt(input,output,length,ks1,iv1,enc);
73		if (length >= sizeof(des_cblock))
74			memcpy(niv1,output[off],sizeof(des_cblock));
75		des_cbc_encrypt(output,output,l8,ks2,iv1,!enc);
76		des_cbc_encrypt(output,output,l8,ks1,iv2, enc);
77		if (length >= sizeof(des_cblock))
78			memcpy(niv2,output[off],sizeof(des_cblock));
79		}
80	else
81		{
82		if (length >= sizeof(des_cblock))
83			memcpy(niv2,input[off],sizeof(des_cblock));
84		des_cbc_encrypt(input,output,l8,ks1,iv2,enc);
85		des_cbc_encrypt(output,output,l8,ks2,iv1,!enc);
86		if (length >= sizeof(des_cblock))
87			memcpy(niv1,output[off],sizeof(des_cblock));
88		des_cbc_encrypt(output,output,length,ks1,iv1, enc);
89		}
90	memcpy(*iv1,niv1,sizeof(des_cblock));
91	memcpy(*iv2,niv2,sizeof(des_cblock));
92	}
93
94