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 n2l(ivec, tout0); 72 n2l(ivec, tout1); 73 ivec -= 8; 74 for (l -= 8; l >= 0; l -= 8) { 75 n2l(in, tin0); 76 n2l(in, tin1); 77 tin0 ^= tout0; 78 tin1 ^= tout1; 79 tin[0] = tin0; 80 tin[1] = tin1; 81 BF_encrypt(tin, schedule); 82 tout0 = tin[0]; 83 tout1 = tin[1]; 84 l2n(tout0, out); 85 l2n(tout1, out); 86 } 87 if (l != -8) { 88 n2ln(in, tin0, tin1, l + 8); 89 tin0 ^= tout0; 90 tin1 ^= tout1; 91 tin[0] = tin0; 92 tin[1] = tin1; 93 BF_encrypt(tin, schedule); 94 tout0 = tin[0]; 95 tout1 = tin[1]; 96 l2n(tout0, out); 97 l2n(tout1, out); 98 } 99 l2n(tout0, ivec); 100 l2n(tout1, ivec); 101 } else { 102 n2l(ivec, xor0); 103 n2l(ivec, xor1); 104 ivec -= 8; 105 for (l -= 8; l >= 0; l -= 8) { 106 n2l(in, tin0); 107 n2l(in, tin1); 108 tin[0] = tin0; 109 tin[1] = tin1; 110 BF_decrypt(tin, schedule); 111 tout0 = tin[0] ^ xor0; 112 tout1 = tin[1] ^ xor1; 113 l2n(tout0, out); 114 l2n(tout1, out); 115 xor0 = tin0; 116 xor1 = tin1; 117 } 118 if (l != -8) { 119 n2l(in, tin0); 120 n2l(in, tin1); 121 tin[0] = tin0; 122 tin[1] = tin1; 123 BF_decrypt(tin, schedule); 124 tout0 = tin[0] ^ xor0; 125 tout1 = tin[1] ^ xor1; 126 l2nn(tout0, tout1, out, l + 8); 127 xor0 = tin0; 128 xor1 = tin1; 129 } 130 l2n(xor0, ivec); 131 l2n(xor1, ivec); 132 } 133 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 134 tin[0] = tin[1] = 0; 135} 136