1 /* $FreeBSD: src/sys/crypto/blowfish/bf_enc.c,v 1.6 2003/06/10 21:38:38 obrien 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 6 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 7 * All rights reserved. 8 * 9 * This package is an SSL implementation written 10 * by Eric Young (eay@cryptsoft.com). 11 * The implementation was written so as to conform with Netscapes SSL. 12 * 13 * This library is free for commercial and non-commercial use as long as 14 * the following conditions are aheared to. The following conditions 15 * apply to all code found in this distribution, be it the RC4, RSA, 16 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 17 * included with this distribution is covered by the same copyright terms 18 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 19 * 20 * Copyright remains Eric Young's, and as such any Copyright notices in 21 * the code are not to be removed. 22 * If this package is used in a product, Eric Young should be given attribution 23 * as the author of the parts of the library used. 24 * This can be in the form of a textual message at program startup or 25 * in documentation (online or textual) provided with the package. 26 * 27 * Redistribution and use in source and binary forms, with or without 28 * modification, are permitted provided that the following conditions 29 * are met: 30 * 1. Redistributions of source code must retain the copyright 31 * notice, this list of conditions and the following disclaimer. 32 * 2. Redistributions in binary form must reproduce the above copyright 33 * notice, this list of conditions and the following disclaimer in the 34 * documentation and/or other materials provided with the distribution. 35 * 3. All advertising materials mentioning features or use of this software 36 * must display the following acknowledgement: 37 * "This product includes cryptographic software written by 38 * Eric Young (eay@cryptsoft.com)" 39 * The word 'cryptographic' can be left out if the rouines from the library 40 * being used are not cryptographic related :-). 41 * 4. If you include any Windows specific code (or a derivative thereof) from 42 * the apps directory (application code) you must include an acknowledgement: 43 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 44 * 45 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * The licence and distribution terms for any publically available version or 58 * derivative of this code cannot be changed. i.e. this code cannot simply be 59 * copied and put under another distribution licence 60 * [including the GNU Public Licence.] 61 */ 62 63 #include <sys/types.h> 64 #include <crypto/blowfish/blowfish.h> 65 #include <crypto/blowfish/bf_locl.h> 66 67 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' 68 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, 69 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993) 70 */ 71 72 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20) 73 If you set BF_ROUNDS to some value other than 16 or 20, you will have 74 to modify the code. 75 #endif 76 77 /* XXX "data" is host endian */ 78 void 79 BF_encrypt(BF_LONG *data, BF_KEY *key) 80 { 81 BF_LONG l, r, *p, *s; 82 83 p = key->P; 84 s= &key->S[0]; 85 l = data[0]; 86 r = data[1]; 87 88 l^=p[0]; 89 BF_ENC(r, l, s, p[ 1]); 90 BF_ENC(l, r, s, p[ 2]); 91 BF_ENC(r, l, s, p[ 3]); 92 BF_ENC(l, r, s, p[ 4]); 93 BF_ENC(r, l, s, p[ 5]); 94 BF_ENC(l, r, s, p[ 6]); 95 BF_ENC(r, l, s, p[ 7]); 96 BF_ENC(l, r, s, p[ 8]); 97 BF_ENC(r, l, s, p[ 9]); 98 BF_ENC(l, r, s, p[10]); 99 BF_ENC(r, l, s, p[11]); 100 BF_ENC(l, r, s, p[12]); 101 BF_ENC(r, l, s, p[13]); 102 BF_ENC(l, r, s, p[14]); 103 BF_ENC(r, l, s, p[15]); 104 BF_ENC(l, r, s, p[16]); 105 #if BF_ROUNDS == 20 106 BF_ENC(r, l, s, p[17]); 107 BF_ENC(l, r, s, p[18]); 108 BF_ENC(r, l, s, p[19]); 109 BF_ENC(l, r, s, p[20]); 110 #endif 111 r ^= p[BF_ROUNDS + 1]; 112 113 data[1] = l & 0xffffffff; 114 data[0] = r & 0xffffffff; 115 } 116 117 /* XXX "data" is host endian */ 118 void 119 BF_decrypt(BF_LONG *data, BF_KEY *key) 120 { 121 BF_LONG l, r, *p, *s; 122 123 p = key->P; 124 s= &key->S[0]; 125 l = data[0]; 126 r = data[1]; 127 128 l ^= p[BF_ROUNDS + 1]; 129 #if BF_ROUNDS == 20 130 BF_ENC(r, l, s, p[20]); 131 BF_ENC(l, r, s, p[19]); 132 BF_ENC(r, l, s, p[18]); 133 BF_ENC(l, r, s, p[17]); 134 #endif 135 BF_ENC(r, l, s, p[16]); 136 BF_ENC(l, r, s, p[15]); 137 BF_ENC(r, l, s, p[14]); 138 BF_ENC(l, r, s, p[13]); 139 BF_ENC(r, l, s, p[12]); 140 BF_ENC(l, r, s, p[11]); 141 BF_ENC(r, l, s, p[10]); 142 BF_ENC(l, r, s, p[ 9]); 143 BF_ENC(r, l, s, p[ 8]); 144 BF_ENC(l, r, s, p[ 7]); 145 BF_ENC(r, l, s, p[ 6]); 146 BF_ENC(l, r, s, p[ 5]); 147 BF_ENC(r, l, s, p[ 4]); 148 BF_ENC(l, r, s, p[ 3]); 149 BF_ENC(r, l, s, p[ 2]); 150 BF_ENC(l, r, s, p[ 1]); 151 r ^= p[0]; 152 153 data[1] = l & 0xffffffff; 154 data[0] = r & 0xffffffff; 155 } 156