[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 |
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| 12 | #define DES_FCRYPT
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| 13 | #include "des_locl.h"
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| 14 | #undef DES_FCRYPT
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| 15 |
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| 16 | #undef PERM_OP
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| 17 | #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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| 18 | (b)^=(t),\
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| 19 | (a)^=((t)<<(n)))
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| 20 |
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| 21 | #undef HPERM_OP
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| 22 | #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
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| 23 | (a)=(a)^(t)^(t>>(16-(n))))\
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| 24 |
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| 25 | void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
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| 26 | DES_LONG Eswap1)
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| 27 | {
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| 28 | register DES_LONG l, r, t, u;
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| 29 | register DES_LONG *s;
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| 30 | register int j;
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| 31 | register DES_LONG E0, E1;
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| 32 |
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| 33 | l = 0;
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| 34 | r = 0;
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| 35 |
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| 36 | s = (DES_LONG *)ks;
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| 37 | E0 = Eswap0;
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| 38 | E1 = Eswap1;
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| 39 |
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| 40 | for (j = 0; j < 25; j++) {
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| 41 | D_ENCRYPT(l, r, 0); /* 1 */
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| 42 | D_ENCRYPT(r, l, 2); /* 2 */
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| 43 | D_ENCRYPT(l, r, 4); /* 3 */
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| 44 | D_ENCRYPT(r, l, 6); /* 4 */
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| 45 | D_ENCRYPT(l, r, 8); /* 5 */
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| 46 | D_ENCRYPT(r, l, 10); /* 6 */
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| 47 | D_ENCRYPT(l, r, 12); /* 7 */
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| 48 | D_ENCRYPT(r, l, 14); /* 8 */
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| 49 | D_ENCRYPT(l, r, 16); /* 9 */
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| 50 | D_ENCRYPT(r, l, 18); /* 10 */
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| 51 | D_ENCRYPT(l, r, 20); /* 11 */
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| 52 | D_ENCRYPT(r, l, 22); /* 12 */
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| 53 | D_ENCRYPT(l, r, 24); /* 13 */
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| 54 | D_ENCRYPT(r, l, 26); /* 14 */
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| 55 | D_ENCRYPT(l, r, 28); /* 15 */
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| 56 | D_ENCRYPT(r, l, 30); /* 16 */
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| 57 | t = l;
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| 58 | l = r;
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| 59 | r = t;
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| 60 | }
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| 61 | l = ROTATE(l, 3) & 0xffffffffL;
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| 62 | r = ROTATE(r, 3) & 0xffffffffL;
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| 63 |
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| 64 | PERM_OP(l, r, t, 1, 0x55555555L);
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| 65 | PERM_OP(r, l, t, 8, 0x00ff00ffL);
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| 66 | PERM_OP(l, r, t, 2, 0x33333333L);
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| 67 | PERM_OP(r, l, t, 16, 0x0000ffffL);
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| 68 | PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
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| 69 |
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| 70 | out[0] = r;
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| 71 | out[1] = l;
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| 72 | }
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