1/* crypto/des/ofb64ede.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 "des_locl.h"
60
61/* The input and output encrypted as though 64bit ofb mode is being
62 * used.  The extra state information to record how much of the
63 * 64bit block we have used is contained in *num;
64 */
65void DES_ede3_ofb64_encrypt(register const unsigned char *in,
66			    register unsigned char *out, long length,
67			    DES_key_schedule *k1, DES_key_schedule *k2,
68			    DES_key_schedule *k3, DES_cblock *ivec,
69			    int *num)
70	{
71	register DES_LONG v0,v1;
72	register int n= *num;
73	register long l=length;
74	DES_cblock d;
75	register char *dp;
76	DES_LONG ti[2];
77	unsigned char *iv;
78	int save=0;
79
80	iv = &(*ivec)[0];
81	c2l(iv,v0);
82	c2l(iv,v1);
83	ti[0]=v0;
84	ti[1]=v1;
85	dp=(char *)d;
86	l2c(v0,dp);
87	l2c(v1,dp);
88	while (l--)
89		{
90		if (n == 0)
91			{
92			/* ti[0]=v0; */
93			/* ti[1]=v1; */
94			DES_encrypt3(ti,k1,k2,k3);
95			v0=ti[0];
96			v1=ti[1];
97
98			dp=(char *)d;
99			l2c(v0,dp);
100			l2c(v1,dp);
101			save++;
102			}
103		*(out++)= *(in++)^d[n];
104		n=(n+1)&0x07;
105		}
106	if (save)
107		{
108/*		v0=ti[0];
109		v1=ti[1];*/
110		iv = &(*ivec)[0];
111		l2c(v0,iv);
112		l2c(v1,iv);
113		}
114	v0=v1=ti[0]=ti[1]=0;
115	*num=n;
116	}
117
118#ifdef undef /* MACRO */
119void DES_ede2_ofb64_encrypt(register unsigned char *in,
120	     register unsigned char *out, long length, DES_key_schedule k1,
121	     DES_key_schedule k2, DES_cblock (*ivec), int *num)
122	{
123	DES_ede3_ofb64_encrypt(in, out, length, k1,k2,k1, ivec, num);
124	}
125#endif
126