1 /*
2 * Copyright 1995-2020 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 /*
11 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <stdio.h>
17
18 #define DES_FCRYPT
19 #include "des_local.h"
20 #undef DES_FCRYPT
21
22 #undef PERM_OP
23 #define PERM_OP(a, b, t, n, m) ((t) = ((((a) >> (n)) ^ (b)) & (m)), \
24 (b) ^= (t), \
25 (a) ^= ((t) << (n)))
26
27 #undef HPERM_OP
28 #define HPERM_OP(a, t, n, m) ((t) = ((((a) << (16 - (n))) ^ (a)) & (m)), \
29 (a) = (a) ^ (t) ^ (t >> (16 - (n))))
30
fcrypt_body(DES_LONG * out,DES_key_schedule * ks,DES_LONG Eswap0,DES_LONG Eswap1)31 void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
32 DES_LONG Eswap1)
33 {
34 register DES_LONG l, r, t, u;
35 register DES_LONG *s;
36 register int j;
37 register DES_LONG E0, E1;
38
39 l = 0;
40 r = 0;
41
42 s = (DES_LONG *)ks;
43 E0 = Eswap0;
44 E1 = Eswap1;
45
46 for (j = 0; j < 25; j++) {
47 D_ENCRYPT(l, r, 0); /* 1 */
48 D_ENCRYPT(r, l, 2); /* 2 */
49 D_ENCRYPT(l, r, 4); /* 3 */
50 D_ENCRYPT(r, l, 6); /* 4 */
51 D_ENCRYPT(l, r, 8); /* 5 */
52 D_ENCRYPT(r, l, 10); /* 6 */
53 D_ENCRYPT(l, r, 12); /* 7 */
54 D_ENCRYPT(r, l, 14); /* 8 */
55 D_ENCRYPT(l, r, 16); /* 9 */
56 D_ENCRYPT(r, l, 18); /* 10 */
57 D_ENCRYPT(l, r, 20); /* 11 */
58 D_ENCRYPT(r, l, 22); /* 12 */
59 D_ENCRYPT(l, r, 24); /* 13 */
60 D_ENCRYPT(r, l, 26); /* 14 */
61 D_ENCRYPT(l, r, 28); /* 15 */
62 D_ENCRYPT(r, l, 30); /* 16 */
63 t = l;
64 l = r;
65 r = t;
66 }
67 l = ROTATE(l, 3) & 0xffffffffL;
68 r = ROTATE(r, 3) & 0xffffffffL;
69
70 PERM_OP(l, r, t, 1, 0x55555555L);
71 PERM_OP(r, l, t, 8, 0x00ff00ffL);
72 PERM_OP(l, r, t, 2, 0x33333333L);
73 PERM_OP(r, l, t, 16, 0x0000ffffL);
74 PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
75
76 out[0] = r;
77 out[1] = l;
78 }
79