fcrypt_b.c revision 296465 
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/*
62 * This version of crypt has been developed from my MIT compatible DES
63 * library. 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#ifndef DES_UNROLL
100        register int i;
101
102        for (i = 0; i < 32; i += 8) {
103            D_ENCRYPT(l, r, i + 0); /* 1 */
104            D_ENCRYPT(r, l, i + 2); /* 2 */
105            D_ENCRYPT(l, r, i + 4); /* 1 */
106            D_ENCRYPT(r, l, i + 6); /* 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