(no commit message)
[strongswan.git] / src / libfreeswan / libcrypto / oldlibdes / des / fcrypt_b.c
1 /* crypto/des/fcrypt_b.c */
2 /* Copyright (C) 1995-1997 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 compatable
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
80 void fcrypt_body(out, ks, Eswap0, Eswap1)
81 DES_LONG *out;
82 des_key_schedule ks;
83 DES_LONG Eswap0;
84 DES_LONG Eswap1;
85 {
86 register DES_LONG l,r,t,u;
87 #ifdef DES_PTR
88 register unsigned char *des_SP=(unsigned char *)des_SPtrans;
89 #endif
90 register DES_LONG *s;
91 register int j;
92 register DES_LONG E0,E1;
93
94 l=0;
95 r=0;
96
97 s=(DES_LONG *)ks;
98 E0=Eswap0;
99 E1=Eswap1;
100
101 for (j=0; j<25; j++)
102 {
103 #ifdef DES_UNROLL
104 register int i;
105
106 for (i=0; i<32; i+=8)
107 {
108 D_ENCRYPT(l,r,i+0); /* 1 */
109 D_ENCRYPT(r,l,i+2); /* 2 */
110 D_ENCRYPT(l,r,i+4); /* 1 */
111 D_ENCRYPT(r,l,i+6); /* 2 */
112 }
113 #else
114 D_ENCRYPT(l,r, 0); /* 1 */
115 D_ENCRYPT(r,l, 2); /* 2 */
116 D_ENCRYPT(l,r, 4); /* 3 */
117 D_ENCRYPT(r,l, 6); /* 4 */
118 D_ENCRYPT(l,r, 8); /* 5 */
119 D_ENCRYPT(r,l,10); /* 6 */
120 D_ENCRYPT(l,r,12); /* 7 */
121 D_ENCRYPT(r,l,14); /* 8 */
122 D_ENCRYPT(l,r,16); /* 9 */
123 D_ENCRYPT(r,l,18); /* 10 */
124 D_ENCRYPT(l,r,20); /* 11 */
125 D_ENCRYPT(r,l,22); /* 12 */
126 D_ENCRYPT(l,r,24); /* 13 */
127 D_ENCRYPT(r,l,26); /* 14 */
128 D_ENCRYPT(l,r,28); /* 15 */
129 D_ENCRYPT(r,l,30); /* 16 */
130 #endif
131
132 t=l;
133 l=r;
134 r=t;
135 }
136 l=ROTATE(l,3)&0xffffffffL;
137 r=ROTATE(r,3)&0xffffffffL;
138
139 PERM_OP(l,r,t, 1,0x55555555L);
140 PERM_OP(r,l,t, 8,0x00ff00ffL);
141 PERM_OP(l,r,t, 2,0x33333333L);
142 PERM_OP(r,l,t,16,0x0000ffffL);
143 PERM_OP(l,r,t, 4,0x0f0f0f0fL);
144
145 out[0]=r;
146 out[1]=l;
147 }
148