1 /* $OpenBSD: xcbc_enc.c,v 1.8 2014/10/28 07:35:58 jsg Exp $ */ 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 "des_locl.h" 60 61 /* RSA's DESX */ 62 63 void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out, 64 long length, DES_key_schedule *schedule, 65 DES_cblock *ivec, const_DES_cblock *inw, 66 const_DES_cblock *outw, int enc) 67 { 68 DES_LONG tin0,tin1; 69 DES_LONG tout0,tout1,xor0,xor1; 70 DES_LONG inW0,inW1,outW0,outW1; 71 const unsigned char *in2; 72 long l=length; 73 DES_LONG tin[2]; 74 unsigned char *iv; 75 76 in2 = &(*inw)[0]; 77 c2l(in2,inW0); 78 c2l(in2,inW1); 79 in2 = &(*outw)[0]; 80 c2l(in2,outW0); 81 c2l(in2,outW1); 82 83 iv = &(*ivec)[0]; 84 85 if (enc) 86 { 87 c2l(iv,tout0); 88 c2l(iv,tout1); 89 for (l-=8; l>=0; l-=8) 90 { 91 c2l(in,tin0); 92 c2l(in,tin1); 93 tin0^=tout0^inW0; tin[0]=tin0; 94 tin1^=tout1^inW1; tin[1]=tin1; 95 DES_encrypt1(tin,schedule,DES_ENCRYPT); 96 tout0=tin[0]^outW0; l2c(tout0,out); 97 tout1=tin[1]^outW1; l2c(tout1,out); 98 } 99 if (l != -8) 100 { 101 c2ln(in,tin0,tin1,l+8); 102 tin0^=tout0^inW0; tin[0]=tin0; 103 tin1^=tout1^inW1; tin[1]=tin1; 104 DES_encrypt1(tin,schedule,DES_ENCRYPT); 105 tout0=tin[0]^outW0; l2c(tout0,out); 106 tout1=tin[1]^outW1; l2c(tout1,out); 107 } 108 iv = &(*ivec)[0]; 109 l2c(tout0,iv); 110 l2c(tout1,iv); 111 } 112 else 113 { 114 c2l(iv,xor0); 115 c2l(iv,xor1); 116 for (l-=8; l>0; l-=8) 117 { 118 c2l(in,tin0); tin[0]=tin0^outW0; 119 c2l(in,tin1); tin[1]=tin1^outW1; 120 DES_encrypt1(tin,schedule,DES_DECRYPT); 121 tout0=tin[0]^xor0^inW0; 122 tout1=tin[1]^xor1^inW1; 123 l2c(tout0,out); 124 l2c(tout1,out); 125 xor0=tin0; 126 xor1=tin1; 127 } 128 if (l != -8) 129 { 130 c2l(in,tin0); tin[0]=tin0^outW0; 131 c2l(in,tin1); tin[1]=tin1^outW1; 132 DES_encrypt1(tin,schedule,DES_DECRYPT); 133 tout0=tin[0]^xor0^inW0; 134 tout1=tin[1]^xor1^inW1; 135 l2cn(tout0,tout1,out,l+8); 136 xor0=tin0; 137 xor1=tin1; 138 } 139 140 iv = &(*ivec)[0]; 141 l2c(xor0,iv); 142 l2c(xor1,iv); 143 } 144 tin0=tin1=tout0=tout1=xor0=xor1=0; 145 inW0=inW1=outW0=outW1=0; 146 tin[0]=tin[1]=0; 147 } 148 149