crypto/des/fcrypt_b.c

   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_locl.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
  25 void 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 }