Kinson Chik | a8fa74c | 2011-07-29 11:33:41 -0700 | [diff] [blame^] | 1 | /* ede_cbcm_enc.c */ |
| 2 | /* Written by Ben Laurie <ben@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@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@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@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 | #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */ |
| 72 | |
| 73 | #ifndef OPENSSL_NO_DESCBCM |
| 74 | #include "des_locl.h" |
| 75 | |
| 76 | void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out, |
| 77 | long length, DES_key_schedule *ks1, DES_key_schedule *ks2, |
| 78 | DES_key_schedule *ks3, DES_cblock *ivec1, DES_cblock *ivec2, |
| 79 | int enc) |
| 80 | { |
| 81 | register DES_LONG tin0,tin1; |
| 82 | register DES_LONG tout0,tout1,xor0,xor1,m0,m1; |
| 83 | register long l=length; |
| 84 | DES_LONG tin[2]; |
| 85 | unsigned char *iv1,*iv2; |
| 86 | |
| 87 | iv1 = &(*ivec1)[0]; |
| 88 | iv2 = &(*ivec2)[0]; |
| 89 | |
| 90 | if (enc) |
| 91 | { |
| 92 | c2l(iv1,m0); |
| 93 | c2l(iv1,m1); |
| 94 | c2l(iv2,tout0); |
| 95 | c2l(iv2,tout1); |
| 96 | for (l-=8; l>=-7; l-=8) |
| 97 | { |
| 98 | tin[0]=m0; |
| 99 | tin[1]=m1; |
| 100 | DES_encrypt1(tin,ks3,1); |
| 101 | m0=tin[0]; |
| 102 | m1=tin[1]; |
| 103 | |
| 104 | if(l < 0) |
| 105 | { |
| 106 | c2ln(in,tin0,tin1,l+8); |
| 107 | } |
| 108 | else |
| 109 | { |
| 110 | c2l(in,tin0); |
| 111 | c2l(in,tin1); |
| 112 | } |
| 113 | tin0^=tout0; |
| 114 | tin1^=tout1; |
| 115 | |
| 116 | tin[0]=tin0; |
| 117 | tin[1]=tin1; |
| 118 | DES_encrypt1(tin,ks1,1); |
| 119 | tin[0]^=m0; |
| 120 | tin[1]^=m1; |
| 121 | DES_encrypt1(tin,ks2,0); |
| 122 | tin[0]^=m0; |
| 123 | tin[1]^=m1; |
| 124 | DES_encrypt1(tin,ks1,1); |
| 125 | tout0=tin[0]; |
| 126 | tout1=tin[1]; |
| 127 | |
| 128 | l2c(tout0,out); |
| 129 | l2c(tout1,out); |
| 130 | } |
| 131 | iv1=&(*ivec1)[0]; |
| 132 | l2c(m0,iv1); |
| 133 | l2c(m1,iv1); |
| 134 | |
| 135 | iv2=&(*ivec2)[0]; |
| 136 | l2c(tout0,iv2); |
| 137 | l2c(tout1,iv2); |
| 138 | } |
| 139 | else |
| 140 | { |
| 141 | register DES_LONG t0,t1; |
| 142 | |
| 143 | c2l(iv1,m0); |
| 144 | c2l(iv1,m1); |
| 145 | c2l(iv2,xor0); |
| 146 | c2l(iv2,xor1); |
| 147 | for (l-=8; l>=-7; l-=8) |
| 148 | { |
| 149 | tin[0]=m0; |
| 150 | tin[1]=m1; |
| 151 | DES_encrypt1(tin,ks3,1); |
| 152 | m0=tin[0]; |
| 153 | m1=tin[1]; |
| 154 | |
| 155 | c2l(in,tin0); |
| 156 | c2l(in,tin1); |
| 157 | |
| 158 | t0=tin0; |
| 159 | t1=tin1; |
| 160 | |
| 161 | tin[0]=tin0; |
| 162 | tin[1]=tin1; |
| 163 | DES_encrypt1(tin,ks1,0); |
| 164 | tin[0]^=m0; |
| 165 | tin[1]^=m1; |
| 166 | DES_encrypt1(tin,ks2,1); |
| 167 | tin[0]^=m0; |
| 168 | tin[1]^=m1; |
| 169 | DES_encrypt1(tin,ks1,0); |
| 170 | tout0=tin[0]; |
| 171 | tout1=tin[1]; |
| 172 | |
| 173 | tout0^=xor0; |
| 174 | tout1^=xor1; |
| 175 | if(l < 0) |
| 176 | { |
| 177 | l2cn(tout0,tout1,out,l+8); |
| 178 | } |
| 179 | else |
| 180 | { |
| 181 | l2c(tout0,out); |
| 182 | l2c(tout1,out); |
| 183 | } |
| 184 | xor0=t0; |
| 185 | xor1=t1; |
| 186 | } |
| 187 | |
| 188 | iv1=&(*ivec1)[0]; |
| 189 | l2c(m0,iv1); |
| 190 | l2c(m1,iv1); |
| 191 | |
| 192 | iv2=&(*ivec2)[0]; |
| 193 | l2c(xor0,iv2); |
| 194 | l2c(xor1,iv2); |
| 195 | } |
| 196 | tin0=tin1=tout0=tout1=xor0=xor1=0; |
| 197 | tin[0]=tin[1]=0; |
| 198 | } |
| 199 | #endif |