Branch data Line data Source code
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 : :
80 : 2 : 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 : 2 : l=0;
92 : 2 : r=0;
93 : :
94 : 2 : s=(DES_LONG *)ks;
95 : 2 : E0=Eswap0;
96 : 2 : E1=Eswap1;
97 : :
98 [ + + ]: 52 : 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 : 50 : D_ENCRYPT(l,r, 0); /* 1 */
110 : 50 : D_ENCRYPT(r,l, 2); /* 2 */
111 : 50 : D_ENCRYPT(l,r, 4); /* 3 */
112 : 50 : D_ENCRYPT(r,l, 6); /* 4 */
113 : 50 : D_ENCRYPT(l,r, 8); /* 5 */
114 : 50 : D_ENCRYPT(r,l,10); /* 6 */
115 : 50 : D_ENCRYPT(l,r,12); /* 7 */
116 : 50 : D_ENCRYPT(r,l,14); /* 8 */
117 : 50 : D_ENCRYPT(l,r,16); /* 9 */
118 : 50 : D_ENCRYPT(r,l,18); /* 10 */
119 : 50 : D_ENCRYPT(l,r,20); /* 11 */
120 : 50 : D_ENCRYPT(r,l,22); /* 12 */
121 : 50 : D_ENCRYPT(l,r,24); /* 13 */
122 : 50 : D_ENCRYPT(r,l,26); /* 14 */
123 : 50 : D_ENCRYPT(l,r,28); /* 15 */
124 : 50 : D_ENCRYPT(r,l,30); /* 16 */
125 : : #endif
126 : :
127 : 50 : t=l;
128 : 50 : l=r;
129 : 50 : r=t;
130 : : }
131 : 2 : l=ROTATE(l,3)&0xffffffffL;
132 : 2 : r=ROTATE(r,3)&0xffffffffL;
133 : :
134 : 2 : PERM_OP(l,r,t, 1,0x55555555L);
135 : 2 : PERM_OP(r,l,t, 8,0x00ff00ffL);
136 : 2 : PERM_OP(l,r,t, 2,0x33333333L);
137 : 2 : PERM_OP(r,l,t,16,0x0000ffffL);
138 : 2 : PERM_OP(l,r,t, 4,0x0f0f0f0fL);
139 : :
140 : 2 : out[0]=r;
141 : 2 : out[1]=l;
142 : 2 : }
143 : :
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