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73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#define DES_FCRYPT
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#include "des_locl.h"
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#undef DES_FCRYPT
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#undef PERM_OP
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#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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(b)^=(t),\
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(a)^=((t)<<(n)))
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#undef HPERM_OP
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#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
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(a)=(a)^(t)^(t>>(16-(n))))\
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void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
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DES_LONG Eswap1)
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{
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register DES_LONG l, r, t, u;
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register DES_LONG *s;
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register int j;
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register DES_LONG E0, E1;
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l = 0;
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r = 0;
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s = (DES_LONG *)ks;
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E0 = Eswap0;
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E1 = Eswap1;
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for (j = 0; j < 25; j++) {
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D_ENCRYPT(l, r, 0); /* 1 */
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D_ENCRYPT(r, l, 2); /* 2 */
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D_ENCRYPT(l, r, 4); /* 3 */
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D_ENCRYPT(r, l, 6); /* 4 */
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D_ENCRYPT(l, r, 8); /* 5 */
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D_ENCRYPT(r, l, 10); /* 6 */
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D_ENCRYPT(l, r, 12); /* 7 */
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D_ENCRYPT(r, l, 14); /* 8 */
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D_ENCRYPT(l, r, 16); /* 9 */
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D_ENCRYPT(r, l, 18); /* 10 */
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D_ENCRYPT(l, r, 20); /* 11 */
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D_ENCRYPT(r, l, 22); /* 12 */
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D_ENCRYPT(l, r, 24); /* 13 */
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D_ENCRYPT(r, l, 26); /* 14 */
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D_ENCRYPT(l, r, 28); /* 15 */
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D_ENCRYPT(r, l, 30); /* 16 */
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t = l;
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l = r;
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r = t;
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}
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l = ROTATE(l, 3) & 0xffffffffL;
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r = ROTATE(r, 3) & 0xffffffffL;
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PERM_OP(l, r, t, 1, 0x55555555L);
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PERM_OP(r, l, t, 8, 0x00ff00ffL);
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PERM_OP(l, r, t, 2, 0x33333333L);
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PERM_OP(r, l, t, 16, 0x0000ffffL);
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PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
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out[0] = r;
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out[1] = l;
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}
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