1/* $FreeBSD: src/sys/crypto/blowfish/bf_enc.c,v 1.1.2.3 2002/03/26 10:12:23 ume Exp $ */ 2/* $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun Exp $ */ 3 4/* crypto/bf/bf_enc.c */ 5/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 6 * All rights reserved. 7 * 8 * This package is an SSL implementation written 9 * by Eric Young (eay@cryptsoft.com). 10 * The implementation was written so as to conform with Netscapes SSL. 11 * 12 * This library is free for commercial and non-commercial use as long as 13 * the following conditions are aheared to. The following conditions 14 * apply to all code found in this distribution, be it the RC4, RSA, 15 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 16 * included with this distribution is covered by the same copyright terms 17 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 18 * 19 * Copyright remains Eric Young's, and as such any Copyright notices in 20 * the code are not to be removed. 21 * If this package is used in a product, Eric Young should be given attribution 22 * as the author of the parts of the library used. 23 * This can be in the form of a textual message at program startup or 24 * in documentation (online or textual) provided with the package. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. All advertising materials mentioning features or use of this software 35 * must display the following acknowledgement: 36 * "This product includes cryptographic software written by 37 * Eric Young (eay@cryptsoft.com)" 38 * The word 'cryptographic' can be left out if the rouines from the library 39 * being used are not cryptographic related :-). 40 * 4. If you include any Windows specific code (or a derivative thereof) from 41 * the apps directory (application code) you must include an acknowledgement: 42 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 43 * 44 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 * 56 * The licence and distribution terms for any publically available version or 57 * derivative of this code cannot be changed. i.e. this code cannot simply be 58 * copied and put under another distribution licence 59 * [including the GNU Public Licence.] 60 */ 61 62#include <sys/types.h> 63#include <crypto/blowfish/blowfish.h> 64#include <crypto/blowfish/bf_locl.h> 65 66/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' 67 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, 68 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993) 69 */ 70 71#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20) 72If you set BF_ROUNDS to some value other than 16 or 20, you will have 73to modify the code. 74#endif 75 76/* XXX "data" is host endian */ 77void 78BF_encrypt(data, key) 79 BF_LONG *data; 80 BF_KEY *key; 81{ 82 register BF_LONG l, r, *p, *s; 83 84 p = key->P; 85 s= &key->S[0]; 86 l = data[0]; 87 r = data[1]; 88 89 l^=p[0]; 90 BF_ENC(r, l, s, p[ 1]); 91 BF_ENC(l, r, s, p[ 2]); 92 BF_ENC(r, l, s, p[ 3]); 93 BF_ENC(l, r, s, p[ 4]); 94 BF_ENC(r, l, s, p[ 5]); 95 BF_ENC(l, r, s, p[ 6]); 96 BF_ENC(r, l, s, p[ 7]); 97 BF_ENC(l, r, s, p[ 8]); 98 BF_ENC(r, l, s, p[ 9]); 99 BF_ENC(l, r, s, p[10]); 100 BF_ENC(r, l, s, p[11]); 101 BF_ENC(l, r, s, p[12]); 102 BF_ENC(r, l, s, p[13]); 103 BF_ENC(l, r, s, p[14]); 104 BF_ENC(r, l, s, p[15]); 105 BF_ENC(l, r, s, p[16]); 106#if BF_ROUNDS == 20 107 BF_ENC(r, l, s, p[17]); 108 BF_ENC(l, r, s, p[18]); 109 BF_ENC(r, l, s, p[19]); 110 BF_ENC(l, r, s, p[20]); 111#endif 112 r ^= p[BF_ROUNDS + 1]; 113 114 data[1] = l & 0xffffffff; 115 data[0] = r & 0xffffffff; 116} 117 118/* XXX "data" is host endian */ 119void 120BF_decrypt(data, key) 121 BF_LONG *data; 122 BF_KEY *key; 123{ 124 register BF_LONG l, r, *p, *s; 125 126 p = key->P; 127 s= &key->S[0]; 128 l = data[0]; 129 r = data[1]; 130 131 l ^= p[BF_ROUNDS + 1]; 132#if BF_ROUNDS == 20 133 BF_ENC(r, l, s, p[20]); 134 BF_ENC(l, r, s, p[19]); 135 BF_ENC(r, l, s, p[18]); 136 BF_ENC(l, r, s, p[17]); 137#endif 138 BF_ENC(r, l, s, p[16]); 139 BF_ENC(l, r, s, p[15]); 140 BF_ENC(r, l, s, p[14]); 141 BF_ENC(l, r, s, p[13]); 142 BF_ENC(r, l, s, p[12]); 143 BF_ENC(l, r, s, p[11]); 144 BF_ENC(r, l, s, p[10]); 145 BF_ENC(l, r, s, p[ 9]); 146 BF_ENC(r, l, s, p[ 8]); 147 BF_ENC(l, r, s, p[ 7]); 148 BF_ENC(r, l, s, p[ 6]); 149 BF_ENC(l, r, s, p[ 5]); 150 BF_ENC(r, l, s, p[ 4]); 151 BF_ENC(l, r, s, p[ 3]); 152 BF_ENC(r, l, s, p[ 2]); 153 BF_ENC(l, r, s, p[ 1]); 154 r ^= p[0]; 155 156 data[1] = l & 0xffffffff; 157 data[0] = r & 0xffffffff; 158} 159