1 /* $NetBSD: bf_cbc.c,v 1.12 2005/12/11 12:20:48 christos Exp $ */ 2 3 /* crypto/bf/bf_cbc.c */ 4 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 5 * All rights reserved. 6 * 7 * This package is an SSL implementation written 8 * by Eric Young (eay (at) cryptsoft.com). 9 * The implementation was written so as to conform with Netscapes SSL. 10 * 11 * This library is free for commercial and non-commercial use as long as 12 * the following conditions are aheared to. The following conditions 13 * apply to all code found in this distribution, be it the RC4, RSA, 14 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 15 * included with this distribution is covered by the same copyright terms 16 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 17 * 18 * Copyright remains Eric Young's, and as such any Copyright notices in 19 * the code are not to be removed. 20 * If this package is used in a product, Eric Young should be given attribution 21 * as the author of the parts of the library used. 22 * This can be in the form of a textual message at program startup or 23 * in documentation (online or textual) provided with the package. 24 * 25 * Redistribution and use in source and binary forms, with or without 26 * modification, are permitted provided that the following conditions 27 * are met: 28 * 1. Redistributions of source code must retain the copyright 29 * notice, this list of conditions and the following disclaimer. 30 * 2. Redistributions in binary form must reproduce the above copyright 31 * notice, this list of conditions and the following disclaimer in the 32 * documentation and/or other materials provided with the distribution. 33 * 3. All advertising materials mentioning features or use of this software 34 * must display the following acknowledgement: 35 * "This product includes cryptographic software written by 36 * Eric Young (eay (at) cryptsoft.com)" 37 * The word 'cryptographic' can be left out if the rouines from the library 38 * being used are not cryptographic related :-). 39 * 4. If you include any Windows specific code (or a derivative thereof) from 40 * the apps directory (application code) you must include an acknowledgement: 41 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 42 * 43 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 * 55 * The licence and distribution terms for any publically available version or 56 * derivative of this code cannot be changed. i.e. this code cannot simply be 57 * copied and put under another distribution licence 58 * [including the GNU Public Licence.] 59 */ 60 61 #include <sys/cdefs.h> 62 __KERNEL_RCSID(0, "$NetBSD: bf_cbc.c,v 1.12 2005/12/11 12:20:48 christos Exp $"); 63 64 #include <sys/types.h> 65 66 #include <crypto/blowfish/blowfish.h> 67 #include "bf_locl.h" 68 69 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 70 const BF_KEY *schedule, unsigned char *ivec, int encrypt) 71 { 72 register BF_LONG tin0,tin1; 73 register BF_LONG tout0,tout1,xor0,xor1; 74 register long l=length; 75 BF_LONG tin[2]; 76 77 if (encrypt) 78 { 79 n2l(ivec,tout0); 80 n2l(ivec,tout1); 81 ivec-=8; 82 for (l-=8; l>=0; l-=8) 83 { 84 n2l(in,tin0); 85 n2l(in,tin1); 86 tin0^=tout0; 87 tin1^=tout1; 88 tin[0]=tin0; 89 tin[1]=tin1; 90 BF_encrypt(tin,(const BF_KEY *)schedule); 91 tout0=tin[0]; 92 tout1=tin[1]; 93 l2n(tout0,out); 94 l2n(tout1,out); 95 } 96 if (l != -8) 97 { 98 n2ln(in,tin0,tin1,l+8); 99 tin0^=tout0; 100 tin1^=tout1; 101 tin[0]=tin0; 102 tin[1]=tin1; 103 BF_encrypt(tin,(const BF_KEY *)schedule); 104 tout0=tin[0]; 105 tout1=tin[1]; 106 l2n(tout0,out); 107 l2n(tout1,out); 108 } 109 l2n(tout0,ivec); 110 l2n(tout1,ivec); 111 } 112 else 113 { 114 n2l(ivec,xor0); 115 n2l(ivec,xor1); 116 ivec-=8; 117 for (l-=8; l>=0; l-=8) 118 { 119 n2l(in,tin0); 120 n2l(in,tin1); 121 tin[0]=tin0; 122 tin[1]=tin1; 123 BF_decrypt(tin,(const BF_KEY *)schedule); 124 tout0=tin[0]^xor0; 125 tout1=tin[1]^xor1; 126 l2n(tout0,out); 127 l2n(tout1,out); 128 xor0=tin0; 129 xor1=tin1; 130 } 131 if (l != -8) 132 { 133 n2l(in,tin0); 134 n2l(in,tin1); 135 tin[0]=tin0; 136 tin[1]=tin1; 137 BF_decrypt(tin,(const BF_KEY *)schedule); 138 tout0=tin[0]^xor0; 139 tout1=tin[1]^xor1; 140 l2nn(tout0,tout1,out,l+8); 141 xor0=tin0; 142 xor1=tin1; 143 } 144 l2n(xor0,ivec); 145 l2n(xor1,ivec); 146 } 147 tin0=tin1=tout0=tout1=xor0=xor1=0; 148 tin[0]=tin[1]=0; 149 } 150 151
Indexes created Wed Sep 24 15:09:51 GMT 2025