1/* crypto/des/fcrypt_b.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60 61/* 62 * This version of crypt has been developed from my MIT compatible DES 63 * library. The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au 64 * Eric Young (eay@cryptsoft.com) 65 */ 66 67#define DES_FCRYPT 68#include "des_locl.h" 69#undef DES_FCRYPT 70 71#undef PERM_OP 72#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 73 (b)^=(t),\ 74 (a)^=((t)<<(n))) 75 76#undef HPERM_OP 77#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ 78 (a)=(a)^(t)^(t>>(16-(n))))\ 79 80void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0, 81 DES_LONG Eswap1) 82{ 83 register DES_LONG l, r, t, u; 84#ifdef DES_PTR 85 register const unsigned char *des_SP = (const unsigned char *)DES_SPtrans; 86#endif 87 register DES_LONG *s; 88 register int j; 89 register DES_LONG E0, E1; 90 91 l = 0; 92 r = 0; 93 94 s = (DES_LONG *)ks; 95 E0 = Eswap0; 96 E1 = Eswap1; 97 98 for (j = 0; j < 25; j++) { 99#ifndef DES_UNROLL 100 register int i; 101 102 for (i = 0; i < 32; i += 4) { 103 D_ENCRYPT(l, r, i + 0); /* 1 */ 104 D_ENCRYPT(r, l, i + 2); /* 2 */ 105 } 106#else 107 D_ENCRYPT(l, r, 0); /* 1 */ 108 D_ENCRYPT(r, l, 2); /* 2 */ 109 D_ENCRYPT(l, r, 4); /* 3 */ 110 D_ENCRYPT(r, l, 6); /* 4 */ 111 D_ENCRYPT(l, r, 8); /* 5 */ 112 D_ENCRYPT(r, l, 10); /* 6 */ 113 D_ENCRYPT(l, r, 12); /* 7 */ 114 D_ENCRYPT(r, l, 14); /* 8 */ 115 D_ENCRYPT(l, r, 16); /* 9 */ 116 D_ENCRYPT(r, l, 18); /* 10 */ 117 D_ENCRYPT(l, r, 20); /* 11 */ 118 D_ENCRYPT(r, l, 22); /* 12 */ 119 D_ENCRYPT(l, r, 24); /* 13 */ 120 D_ENCRYPT(r, l, 26); /* 14 */ 121 D_ENCRYPT(l, r, 28); /* 15 */ 122 D_ENCRYPT(r, l, 30); /* 16 */ 123#endif 124 125 t = l; 126 l = r; 127 r = t; 128 } 129 l = ROTATE(l, 3) & 0xffffffffL; 130 r = ROTATE(r, 3) & 0xffffffffL; 131 132 PERM_OP(l, r, t, 1, 0x55555555L); 133 PERM_OP(r, l, t, 8, 0x00ff00ffL); 134 PERM_OP(l, r, t, 2, 0x33333333L); 135 PERM_OP(r, l, t, 16, 0x0000ffffL); 136 PERM_OP(l, r, t, 4, 0x0f0f0f0fL); 137 138 out[0] = r; 139 out[1] = l; 140} 141