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fcrypt_b.c
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1 /* crypto/des/fcrypt_b.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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 ([email protected])
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(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