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 1.5 2001/11/13 01:40:08 lukem Exp $"); 61 62 #include <openssl/blowfish.h> 63 #include "bf_locl.h" 64 65 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 66 const BF_KEY *schedule, unsigned char *ivec, int encrypt) 67 { 68 register BF_LONG tin0,tin1; 69 register BF_LONG tout0,tout1,xor0,xor1; 70 register long l=length; 71 BF_LONG tin[2]; 72 73 if (encrypt) 74 { 75 n2l(ivec,tout0); 76 n2l(ivec,tout1); 77 ivec-=8; 78 for (l-=8; l>=0; l-=8) 79 { 80 n2l(in,tin0); 81 n2l(in,tin1); 82 tin0^=tout0; 83 tin1^=tout1; 84 tin[0]=tin0; 85 tin[1]=tin1; 86 BF_encrypt(tin,schedule); 87 tout0=tin[0]; 88 tout1=tin[1]; 89 l2n(tout0,out); 90 l2n(tout1,out); 91 } 92 if (l != -8) 93 { 94 n2ln(in,tin0,tin1,l+8); 95 tin0^=tout0; 96 tin1^=tout1; 97 tin[0]=tin0; 98 tin[1]=tin1; 99 BF_encrypt(tin,schedule); 100 tout0=tin[0]; 101 tout1=tin[1]; 102 l2n(tout0,out); 103 l2n(tout1,out); 104 } 105 l2n(tout0,ivec); 106 l2n(tout1,ivec); 107 } 108 else 109 { 110 n2l(ivec,xor0); 111 n2l(ivec,xor1); 112 ivec-=8; 113 for (l-=8; l>=0; l-=8) 114 { 115 n2l(in,tin0); 116 n2l(in,tin1); 117 tin[0]=tin0; 118 tin[1]=tin1; 119 BF_decrypt(tin,schedule); 120 tout0=tin[0]^xor0; 121 tout1=tin[1]^xor1; 122 l2n(tout0,out); 123 l2n(tout1,out); 124 xor0=tin0; 125 xor1=tin1; 126 } 127 if (l != -8) 128 { 129 n2l(in,tin0); 130 n2l(in,tin1); 131 tin[0]=tin0; 132 tin[1]=tin1; 133 BF_decrypt(tin,schedule); 134 tout0=tin[0]^xor0; 135 tout1=tin[1]^xor1; 136 l2nn(tout0,tout1,out,l+8); 137 xor0=tin0; 138 xor1=tin1; 139 } 140 l2n(xor0,ivec); 141 l2n(xor1,ivec); 142 } 143 tin0=tin1=tout0=tout1=xor0=xor1=0; 144 tin[0]=tin[1]=0; 145 } 146 147