fcrypt_b.c revision 221304ee937bc0910948a8be1320cb8cc4eb6d36 
1/* crypto/des/fcrypt_b.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
61/* This version of crypt has been developed from my MIT compatible
62 * DES library.
63 * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
64 * Eric Young (eay@cryptsoft.com)
65 */
66
67#define DES_FCRYPT
68#include "des_locl.h"
69#undef DES_FCRYPT
70
71#undef PERM_OP
72#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
73	(b)^=(t),\
74	(a)^=((t)<<(n)))
75
76#undef HPERM_OP
77#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
78	(a)=(a)^(t)^(t>>(16-(n))))\
79
80void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
81		 DES_LONG Eswap1)
82	{
83	register DES_LONG l,r,t,u;
84#ifdef DES_PTR
85	register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
86#endif
87	register DES_LONG *s;
88	register int j;
89	register DES_LONG E0,E1;
90
91	l=0;
92	r=0;
93
94	s=(DES_LONG *)ks;
95	E0=Eswap0;
96	E1=Eswap1;
97
98	for (j=0; j<25; j++)
99		{
100#ifndef DES_UNROLL
101		register int i;
102
103		for (i=0; i<32; i+=4)
104			{
105			D_ENCRYPT(l,r,i+0); /*  1 */
106			D_ENCRYPT(r,l,i+2); /*  2 */
107			}
108#else
109		D_ENCRYPT(l,r, 0); /*  1 */
110		D_ENCRYPT(r,l, 2); /*  2 */
111		D_ENCRYPT(l,r, 4); /*  3 */
112		D_ENCRYPT(r,l, 6); /*  4 */
113		D_ENCRYPT(l,r, 8); /*  5 */
114		D_ENCRYPT(r,l,10); /*  6 */
115		D_ENCRYPT(l,r,12); /*  7 */
116		D_ENCRYPT(r,l,14); /*  8 */
117		D_ENCRYPT(l,r,16); /*  9 */
118		D_ENCRYPT(r,l,18); /*  10 */
119		D_ENCRYPT(l,r,20); /*  11 */
120		D_ENCRYPT(r,l,22); /*  12 */
121		D_ENCRYPT(l,r,24); /*  13 */
122		D_ENCRYPT(r,l,26); /*  14 */
123		D_ENCRYPT(l,r,28); /*  15 */
124		D_ENCRYPT(r,l,30); /*  16 */
125#endif
126
127		t=l;
128		l=r;
129		r=t;
130		}
131	l=ROTATE(l,3)&0xffffffffL;
132	r=ROTATE(r,3)&0xffffffffL;
133
134	PERM_OP(l,r,t, 1,0x55555555L);
135	PERM_OP(r,l,t, 8,0x00ff00ffL);
136	PERM_OP(l,r,t, 2,0x33333333L);
137	PERM_OP(r,l,t,16,0x0000ffffL);
138	PERM_OP(l,r,t, 4,0x0f0f0f0fL);
139
140	out[0]=r;
141	out[1]=l;
142	}
143
144