1/* $OpenBSD: ncbc_enc.c,v 1.11 2024/03/29 01:47:29 joshua Exp $ */ 2/* 3 * #included by: 4 * cbc_enc.c (DES_cbc_encrypt) 5 * des_enc.c (DES_ncbc_encrypt) 6 */ 7/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 8 * All rights reserved. 9 * 10 * This package is an SSL implementation written 11 * by Eric Young (eay@cryptsoft.com). 12 * The implementation was written so as to conform with Netscapes SSL. 13 * 14 * This library is free for commercial and non-commercial use as long as 15 * the following conditions are aheared to. The following conditions 16 * apply to all code found in this distribution, be it the RC4, RSA, 17 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 18 * included with this distribution is covered by the same copyright terms 19 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 20 * 21 * Copyright remains Eric Young's, and as such any Copyright notices in 22 * the code are not to be removed. 23 * If this package is used in a product, Eric Young should be given attribution 24 * as the author of the parts of the library used. 25 * This can be in the form of a textual message at program startup or 26 * in documentation (online or textual) provided with the package. 27 * 28 * Redistribution and use in source and binary forms, with or without 29 * modification, are permitted provided that the following conditions 30 * are met: 31 * 1. Redistributions of source code must retain the copyright 32 * notice, this list of conditions and the following disclaimer. 33 * 2. Redistributions in binary form must reproduce the above copyright 34 * notice, this list of conditions and the following disclaimer in the 35 * documentation and/or other materials provided with the distribution. 36 * 3. All advertising materials mentioning features or use of this software 37 * must display the following acknowledgement: 38 * "This product includes cryptographic software written by 39 * Eric Young (eay@cryptsoft.com)" 40 * The word 'cryptographic' can be left out if the rouines from the library 41 * being used are not cryptographic related :-). 42 * 4. If you include any Windows specific code (or a derivative thereof) from 43 * the apps directory (application code) you must include an acknowledgement: 44 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 45 * 46 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 * 58 * The licence and distribution terms for any publically available version or 59 * derivative of this code cannot be changed. i.e. this code cannot simply be 60 * copied and put under another distribution licence 61 * [including the GNU Public Licence.] 62 */ 63 64#include "des_local.h" 65 66#ifdef CBC_ENC_C__DONT_UPDATE_IV 67void 68DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 69 DES_key_schedule *_schedule, DES_cblock *ivec, int enc) 70#else 71void 72DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length, 73 DES_key_schedule *_schedule, DES_cblock *ivec, int enc) 74#endif 75{ 76 DES_LONG tin0, tin1; 77 DES_LONG tout0, tout1, xor0, xor1; 78 long l = length; 79 DES_LONG tin[2]; 80 unsigned char *iv; 81 82 iv = &(*ivec)[0]; 83 84 if (enc) { 85 c2l(iv, tout0); 86 c2l(iv, tout1); 87 for (l -= 8; l >= 0; l -= 8) { 88 c2l(in, tin0); 89 c2l(in, tin1); 90 tin0 ^= tout0; 91 tin[0] = tin0; 92 tin1 ^= tout1; 93 tin[1] = tin1; 94 DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); 95 tout0 = tin[0]; 96 l2c(tout0, out); 97 tout1 = tin[1]; 98 l2c(tout1, out); 99 } 100 if (l != -8) { 101 c2ln(in, tin0, tin1, l + 8); 102 tin0 ^= tout0; 103 tin[0] = tin0; 104 tin1 ^= tout1; 105 tin[1] = tin1; 106 DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); 107 tout0 = tin[0]; 108 l2c(tout0, out); 109 tout1 = tin[1]; 110 l2c(tout1, out); 111 } 112#ifndef CBC_ENC_C__DONT_UPDATE_IV 113 iv = &(*ivec)[0]; 114 l2c(tout0, iv); 115 l2c(tout1, iv); 116#endif 117 } else { 118 c2l(iv, xor0); 119 c2l(iv, xor1); 120 for (l -= 8; l >= 0; l -= 8) { 121 c2l(in, tin0); 122 tin[0] = tin0; 123 c2l(in, tin1); 124 tin[1] = tin1; 125 DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); 126 tout0 = tin[0] ^ xor0; 127 tout1 = tin[1] ^ xor1; 128 l2c(tout0, out); 129 l2c(tout1, out); 130 xor0 = tin0; 131 xor1 = tin1; 132 } 133 if (l != -8) { 134 c2l(in, tin0); 135 tin[0] = tin0; 136 c2l(in, tin1); 137 tin[1] = tin1; 138 DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); 139 tout0 = tin[0] ^ xor0; 140 tout1 = tin[1] ^ xor1; 141 l2cn(tout0, tout1, out, l + 8); 142#ifndef CBC_ENC_C__DONT_UPDATE_IV 143 xor0 = tin0; 144 xor1 = tin1; 145#endif 146 } 147#ifndef CBC_ENC_C__DONT_UPDATE_IV 148 iv = &(*ivec)[0]; 149 l2c(xor0, iv); 150 l2c(xor1, iv); 151#endif 152 } 153 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 154 tin[0] = tin[1] = 0; 155} 156#ifdef CBC_ENC_C__DONT_UPDATE_IV 157LCRYPTO_ALIAS(DES_cbc_encrypt); 158#else 159LCRYPTO_ALIAS(DES_ncbc_encrypt); 160#endif 161