201 lines
5 KiB
C
201 lines
5 KiB
C
/* ede_cbcm_enc.c */
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/* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL
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* project 13 Feb 1999.
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*/
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/* ====================================================================
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* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/*
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This is an implementation of Triple DES Cipher Block Chaining with Output
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Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).
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Note that there is a known attack on this by Biham and Knudsen but it takes
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a lot of work:
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http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz
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*/
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#include "des_locl.h"
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void des_ede3_cbcm_encrypt(in, out, length, ks1, ks2, ks3, ivec1, ivec2, enc)
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const unsigned char *in;
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unsigned char *out;
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long length;
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des_key_schedule ks1;
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des_key_schedule ks2;
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des_key_schedule ks3;
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des_cblock ivec1;
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des_cblock ivec2;
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int enc;
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{
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register DES_LONG tin0,tin1;
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register DES_LONG tout0,tout1,xor0,xor1,m0,m1;
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register long l=length;
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DES_LONG tin[2];
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unsigned char *iv1,*iv2;
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iv1=ivec1;
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iv2=ivec2;
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if (enc)
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{
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c2l(iv1,m0);
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c2l(iv1,m1);
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c2l(iv2,tout0);
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c2l(iv2,tout1);
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for (l-=8; l>=-7; l-=8)
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{
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tin[0]=m0;
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tin[1]=m1;
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des_encrypt(tin,ks3,1);
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m0=tin[0];
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m1=tin[1];
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if(l < 0)
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{
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c2ln(in,tin0,tin1,l+8);
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}
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else
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{
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c2l(in,tin0);
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c2l(in,tin1);
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}
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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des_encrypt(tin,ks1,1);
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tin[0]^=m0;
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tin[1]^=m1;
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des_encrypt(tin,ks2,0);
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tin[0]^=m0;
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tin[1]^=m1;
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des_encrypt(tin,ks1,1);
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tout0=tin[0];
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tout1=tin[1];
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l2c(tout0,out);
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l2c(tout1,out);
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}
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iv1=ivec1;
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l2c(m0,iv1);
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l2c(m1,iv1);
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iv2=ivec2;
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l2c(tout0,iv2);
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l2c(tout1,iv2);
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}
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else
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{
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register DES_LONG t0,t1;
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c2l(iv1,m0);
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c2l(iv1,m1);
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c2l(iv2,xor0);
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c2l(iv2,xor1);
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for (l-=8; l>=-7; l-=8)
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{
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tin[0]=m0;
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tin[1]=m1;
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des_encrypt(tin,ks3,1);
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m0=tin[0];
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m1=tin[1];
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c2l(in,tin0);
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c2l(in,tin1);
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t0=tin0;
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t1=tin1;
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tin[0]=tin0;
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tin[1]=tin1;
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des_encrypt(tin,ks1,0);
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tin[0]^=m0;
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tin[1]^=m1;
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des_encrypt(tin,ks2,1);
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tin[0]^=m0;
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tin[1]^=m1;
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des_encrypt(tin,ks1,0);
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tout0=tin[0];
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tout1=tin[1];
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tout0^=xor0;
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tout1^=xor1;
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if(l < 0)
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{
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l2cn(tout0,tout1,out,l+8);
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}
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else
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{
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l2c(tout0,out);
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l2c(tout1,out);
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}
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xor0=t0;
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xor1=t1;
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}
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iv1=ivec1;
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l2c(m0,iv1);
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l2c(m1,iv1);
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iv2=ivec2;
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l2c(xor0,iv2);
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l2c(xor1,iv2);
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}
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tin0=tin1=tout0=tout1=xor0=xor1=0;
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tin[0]=tin[1]=0;
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}
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