1 /* crypto/des/fcrypt_b.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 /* This version of crypt has been developed from my MIT compatible 62 * DES library. 63 * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au 64 * Eric Young (eay (at) 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 80 void 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 { 100 #ifndef DES_UNROLL 101 register int i; 102 103 for (i=0; i<32; i+=4) 104 { 105 D_ENCRYPT(l,r,i+0); /* 1 */ 106 D_ENCRYPT(r,l,i+2); /* 2 */ 107 } 108 #else 109 D_ENCRYPT(l,r, 0); /* 1 */ 110 D_ENCRYPT(r,l, 2); /* 2 */ 111 D_ENCRYPT(l,r, 4); /* 3 */ 112 D_ENCRYPT(r,l, 6); /* 4 */ 113 D_ENCRYPT(l,r, 8); /* 5 */ 114 D_ENCRYPT(r,l,10); /* 6 */ 115 D_ENCRYPT(l,r,12); /* 7 */ 116 D_ENCRYPT(r,l,14); /* 8 */ 117 D_ENCRYPT(l,r,16); /* 9 */ 118 D_ENCRYPT(r,l,18); /* 10 */ 119 D_ENCRYPT(l,r,20); /* 11 */ 120 D_ENCRYPT(r,l,22); /* 12 */ 121 D_ENCRYPT(l,r,24); /* 13 */ 122 D_ENCRYPT(r,l,26); /* 14 */ 123 D_ENCRYPT(l,r,28); /* 15 */ 124 D_ENCRYPT(r,l,30); /* 16 */ 125 #endif 126 127 t=l; 128 l=r; 129 r=t; 130 } 131 l=ROTATE(l,3)&0xffffffffL; 132 r=ROTATE(r,3)&0xffffffffL; 133 134 PERM_OP(l,r,t, 1,0x55555555L); 135 PERM_OP(r,l,t, 8,0x00ff00ffL); 136 PERM_OP(l,r,t, 2,0x33333333L); 137 PERM_OP(r,l,t,16,0x0000ffffL); 138 PERM_OP(l,r,t, 4,0x0f0f0f0fL); 139 140 out[0]=r; 141 out[1]=l; 142 } 143 144
