189 lines
5.9 KiB
C
189 lines
5.9 KiB
C
/* ede_cbcm_enc.c */
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/*
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* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL project 13 Feb
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* 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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*
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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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*
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* Note that there is a known attack on this by Biham and Knudsen but it
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* takes a lot of work:
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*
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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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*/
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#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */
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#ifndef OPENSSL_NO_DESCBCM
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# include "des_locl.h"
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void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
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long length, DES_key_schedule *ks1,
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DES_key_schedule *ks2, DES_key_schedule *ks3,
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DES_cblock *ivec1, DES_cblock *ivec2, 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)[0];
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iv2 = &(*ivec2)[0];
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if (enc) {
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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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tin[0] = m0;
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tin[1] = m1;
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DES_encrypt1(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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c2ln(in, tin0, tin1, l + 8);
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} else {
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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_encrypt1(tin, ks1, 1);
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tin[0] ^= m0;
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tin[1] ^= m1;
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DES_encrypt1(tin, ks2, 0);
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tin[0] ^= m0;
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tin[1] ^= m1;
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DES_encrypt1(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)[0];
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l2c(m0, iv1);
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l2c(m1, iv1);
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iv2 = &(*ivec2)[0];
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l2c(tout0, iv2);
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l2c(tout1, iv2);
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} else {
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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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tin[0] = m0;
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tin[1] = m1;
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DES_encrypt1(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_encrypt1(tin, ks1, 0);
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tin[0] ^= m0;
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tin[1] ^= m1;
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DES_encrypt1(tin, ks2, 1);
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tin[0] ^= m0;
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tin[1] ^= m1;
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DES_encrypt1(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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l2cn(tout0, tout1, out, l + 8);
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} else {
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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)[0];
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l2c(m0, iv1);
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l2c(m1, iv1);
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iv2 = &(*ivec2)[0];
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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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#endif
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