A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* DES low level APIs are deprecated for public use, but still ok for internal
* use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#define DES_FCRYPT
#include "des_local.h"
#undef DES_FCRYPT
#undef PERM_OP
#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
(b)^=(t),\
(a)^=((t)<<(n)))
#undef HPERM_OP
#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
(a)=(a)^(t)^(t>>(16-(n))))\
void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
DES_LONG Eswap1)
{
register DES_LONG l, r, t, u;
register DES_LONG *s;
register int j;
register DES_LONG E0, E1;
l = 0;
r = 0;
s = (DES_LONG *)ks;
E0 = Eswap0;
E1 = Eswap1;
for (j = 0; j < 25; j++) {
D_ENCRYPT(l, r, 0); /* 1 */
D_ENCRYPT(r, l, 2); /* 2 */
D_ENCRYPT(l, r, 4); /* 3 */
D_ENCRYPT(r, l, 6); /* 4 */
D_ENCRYPT(l, r, 8); /* 5 */
D_ENCRYPT(r, l, 10); /* 6 */
D_ENCRYPT(l, r, 12); /* 7 */
D_ENCRYPT(r, l, 14); /* 8 */
D_ENCRYPT(l, r, 16); /* 9 */
D_ENCRYPT(r, l, 18); /* 10 */
D_ENCRYPT(l, r, 20); /* 11 */
D_ENCRYPT(r, l, 22); /* 12 */
D_ENCRYPT(l, r, 24); /* 13 */
D_ENCRYPT(r, l, 26); /* 14 */
D_ENCRYPT(l, r, 28); /* 15 */
D_ENCRYPT(r, l, 30); /* 16 */
t = l;
l = r;
r = t;
}
l = ROTATE(l, 3) & 0xffffffffL;
r = ROTATE(r, 3) & 0xffffffffL;
PERM_OP(l, r, t, 1, 0x55555555L);
PERM_OP(r, l, t, 8, 0x00ff00ffL);
PERM_OP(l, r, t, 2, 0x33333333L);
PERM_OP(r, l, t, 16, 0x0000ffffL);
PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
out[0] = r;
out[1] = l;
}