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