1 /* crypto/bf/bf_cbc.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 <sys/cdefs.h> 60 __KERNEL_RCSID(0, "$NetBSD: bf_cbc.c,v 1.8 2002/09/08 07:52:41 elric Exp $"); 61 62 #include <sys/types.h> 63 64 #include <crypto/blowfish/blowfish.h> 65 #include "bf_locl.h" 66 67 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 68 const BF_KEY *schedule, unsigned char *ivec, int encrypt) 69 { 70 register BF_LONG tin0,tin1; 71 register BF_LONG tout0,tout1,xor0,xor1; 72 register long l=length; 73 BF_LONG tin[2]; 74 75 if (encrypt) 76 { 77 n2l(ivec,tout0); 78 n2l(ivec,tout1); 79 ivec-=8; 80 for (l-=8; l>=0; l-=8) 81 { 82 n2l(in,tin0); 83 n2l(in,tin1); 84 tin0^=tout0; 85 tin1^=tout1; 86 tin[0]=tin0; 87 tin[1]=tin1; 88 BF_encrypt(tin,(BF_KEY *)schedule); 89 tout0=tin[0]; 90 tout1=tin[1]; 91 l2n(tout0,out); 92 l2n(tout1,out); 93 } 94 if (l != -8) 95 { 96 n2ln(in,tin0,tin1,l+8); 97 tin0^=tout0; 98 tin1^=tout1; 99 tin[0]=tin0; 100 tin[1]=tin1; 101 BF_encrypt(tin,(BF_KEY *)schedule); 102 tout0=tin[0]; 103 tout1=tin[1]; 104 l2n(tout0,out); 105 l2n(tout1,out); 106 } 107 l2n(tout0,ivec); 108 l2n(tout1,ivec); 109 } 110 else 111 { 112 n2l(ivec,xor0); 113 n2l(ivec,xor1); 114 ivec-=8; 115 for (l-=8; l>=0; l-=8) 116 { 117 n2l(in,tin0); 118 n2l(in,tin1); 119 tin[0]=tin0; 120 tin[1]=tin1; 121 BF_decrypt(tin,(BF_KEY *)schedule); 122 tout0=tin[0]^xor0; 123 tout1=tin[1]^xor1; 124 l2n(tout0,out); 125 l2n(tout1,out); 126 xor0=tin0; 127 xor1=tin1; 128 } 129 if (l != -8) 130 { 131 n2l(in,tin0); 132 n2l(in,tin1); 133 tin[0]=tin0; 134 tin[1]=tin1; 135 BF_decrypt(tin,(BF_KEY *)schedule); 136 tout0=tin[0]^xor0; 137 tout1=tin[1]^xor1; 138 l2nn(tout0,tout1,out,l+8); 139 xor0=tin0; 140 xor1=tin1; 141 } 142 l2n(xor0,ivec); 143 l2n(xor1,ivec); 144 } 145 tin0=tin1=tout0=tout1=xor0=xor1=0; 146 tin[0]=tin[1]=0; 147 } 148 149