1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11
12#define DES_FCRYPT
13#include "des_local.h"
14#undef DES_FCRYPT
15
16#undef PERM_OP
17#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
18 (b)^=(t),\
19 (a)^=((t)<<(n)))
20
21#undef HPERM_OP
22#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
23 (a)=(a)^(t)^(t>>(16-(n))))\
24
25void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
26 DES_LONG Eswap1)
27{
28 register DES_LONG l, r, t, u;
29 register DES_LONG *s;
30 register int j;
31 register DES_LONG E0, E1;
32
33 l = 0;
34 r = 0;
35
36 s = (DES_LONG *)ks;
37 E0 = Eswap0;
38 E1 = Eswap1;
39
40 for (j = 0; j < 25; j++) {
41 D_ENCRYPT(l, r, 0); /* 1 */
42 D_ENCRYPT(r, l, 2); /* 2 */
43 D_ENCRYPT(l, r, 4); /* 3 */
44 D_ENCRYPT(r, l, 6); /* 4 */
45 D_ENCRYPT(l, r, 8); /* 5 */
46 D_ENCRYPT(r, l, 10); /* 6 */
47 D_ENCRYPT(l, r, 12); /* 7 */
48 D_ENCRYPT(r, l, 14); /* 8 */
49 D_ENCRYPT(l, r, 16); /* 9 */
50 D_ENCRYPT(r, l, 18); /* 10 */
51 D_ENCRYPT(l, r, 20); /* 11 */
52 D_ENCRYPT(r, l, 22); /* 12 */
53 D_ENCRYPT(l, r, 24); /* 13 */
54 D_ENCRYPT(r, l, 26); /* 14 */
55 D_ENCRYPT(l, r, 28); /* 15 */
56 D_ENCRYPT(r, l, 30); /* 16 */
57 t = l;
58 l = r;
59 r = t;
60 }
61 l = ROTATE(l, 3) & 0xffffffffL;
62 r = ROTATE(r, 3) & 0xffffffffL;
63
64 PERM_OP(l, r, t, 1, 0x55555555L);
65 PERM_OP(r, l, t, 8, 0x00ff00ffL);
66 PERM_OP(l, r, t, 2, 0x33333333L);
67 PERM_OP(r, l, t, 16, 0x0000ffffL);
68 PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
69
70 out[0] = r;
71 out[1] = l;
72}
73