1 /* ede_cbcm_enc.c */ 2 /* Written by Ben Laurie <ben (at) algroup.co.uk> for the OpenSSL 3 * project 13 Feb 1999. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing (at) OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). 56 * 57 */ 58 59 /* 60 61 This is an implementation of Triple DES Cipher Block Chaining with Output 62 Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom). 63 64 Note that there is a known attack on this by Biham and Knudsen but it takes 65 a lot of work: 66 67 http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz 68 69 */ 70 71 #ifndef NO_DESCBCM 72 #include "des_locl.h" 73 74 void des_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out, 75 long length, des_key_schedule ks1, des_key_schedule ks2, 76 des_key_schedule ks3, des_cblock *ivec1, des_cblock *ivec2, 77 int enc) 78 { 79 register DES_LONG tin0,tin1; 80 register DES_LONG tout0,tout1,xor0,xor1,m0,m1; 81 register long l=length; 82 DES_LONG tin[2]; 83 unsigned char *iv1,*iv2; 84 85 iv1 = &(*ivec1)[0]; 86 iv2 = &(*ivec2)[0]; 87 88 if (enc) 89 { 90 c2l(iv1,m0); 91 c2l(iv1,m1); 92 c2l(iv2,tout0); 93 c2l(iv2,tout1); 94 for (l-=8; l>=-7; l-=8) 95 { 96 tin[0]=m0; 97 tin[1]=m1; 98 des_encrypt1(tin,ks3,1); 99 m0=tin[0]; 100 m1=tin[1]; 101 102 if(l < 0) 103 { 104 c2ln(in,tin0,tin1,l+8); 105 } 106 else 107 { 108 c2l(in,tin0); 109 c2l(in,tin1); 110 } 111 tin0^=tout0; 112 tin1^=tout1; 113 114 tin[0]=tin0; 115 tin[1]=tin1; 116 des_encrypt1(tin,ks1,1); 117 tin[0]^=m0; 118 tin[1]^=m1; 119 des_encrypt1(tin,ks2,0); 120 tin[0]^=m0; 121 tin[1]^=m1; 122 des_encrypt1(tin,ks1,1); 123 tout0=tin[0]; 124 tout1=tin[1]; 125 126 l2c(tout0,out); 127 l2c(tout1,out); 128 } 129 iv1=&(*ivec1)[0]; 130 l2c(m0,iv1); 131 l2c(m1,iv1); 132 133 iv2=&(*ivec2)[0]; 134 l2c(tout0,iv2); 135 l2c(tout1,iv2); 136 } 137 else 138 { 139 register DES_LONG t0,t1; 140 141 c2l(iv1,m0); 142 c2l(iv1,m1); 143 c2l(iv2,xor0); 144 c2l(iv2,xor1); 145 for (l-=8; l>=-7; l-=8) 146 { 147 tin[0]=m0; 148 tin[1]=m1; 149 des_encrypt1(tin,ks3,1); 150 m0=tin[0]; 151 m1=tin[1]; 152 153 c2l(in,tin0); 154 c2l(in,tin1); 155 156 t0=tin0; 157 t1=tin1; 158 159 tin[0]=tin0; 160 tin[1]=tin1; 161 des_encrypt1(tin,ks1,0); 162 tin[0]^=m0; 163 tin[1]^=m1; 164 des_encrypt1(tin,ks2,1); 165 tin[0]^=m0; 166 tin[1]^=m1; 167 des_encrypt1(tin,ks1,0); 168 tout0=tin[0]; 169 tout1=tin[1]; 170 171 tout0^=xor0; 172 tout1^=xor1; 173 if(l < 0) 174 { 175 l2cn(tout0,tout1,out,l+8); 176 } 177 else 178 { 179 l2c(tout0,out); 180 l2c(tout1,out); 181 } 182 xor0=t0; 183 xor1=t1; 184 } 185 186 iv1=&(*ivec1)[0]; 187 l2c(m0,iv1); 188 l2c(m1,iv1); 189 190 iv2=&(*ivec2)[0]; 191 l2c(xor0,iv2); 192 l2c(xor1,iv2); 193 } 194 tin0=tin1=tout0=tout1=xor0=xor1=0; 195 tin[0]=tin[1]=0; 196 } 197 #endif 198
Indexes created Mon Mar 02 05:31:46 UTC 2026