openssl1.0/crypto/des/ede_cbcm_enc.c
2019-08-09 10:00:55 +02:00

190 lines
5.9 KiB
C

/* ede_cbcm_enc.c */
/*
* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL project 13 Feb
* 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/*
*
* This is an implementation of Triple DES Cipher Block Chaining with Output
* Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).
*
* Note that there is a known attack on this by Biham and Knudsen but it
* takes a lot of work:
*
* http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz
*
*/
#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */
#ifndef OPENSSL_NO_DESCBCM
# include "des_locl.h"
void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
long length, DES_key_schedule *ks1,
DES_key_schedule *ks2, DES_key_schedule *ks3,
DES_cblock *ivec1, DES_cblock *ivec2, int enc)
{
register DES_LONG tin0, tin1;
register DES_LONG tout0, tout1, xor0, xor1, m0, m1;
register long l = length;
DES_LONG tin[2];
unsigned char *iv1, *iv2;
iv1 = &(*ivec1)[0];
iv2 = &(*ivec2)[0];
if (enc) {
c2l(iv1, m0);
c2l(iv1, m1);
c2l(iv2, tout0);
c2l(iv2, tout1);
for (l -= 8; l >= -7; l -= 8) {
tin[0] = m0;
tin[1] = m1;
DES_encrypt1(tin, ks3, 1);
m0 = tin[0];
m1 = tin[1];
if (l < 0) {
c2ln(in, tin0, tin1, l + 8);
} else {
c2l(in, tin0);
c2l(in, tin1);
}
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
DES_encrypt1(tin, ks1, 1);
tin[0] ^= m0;
tin[1] ^= m1;
DES_encrypt1(tin, ks2, 0);
tin[0] ^= m0;
tin[1] ^= m1;
DES_encrypt1(tin, ks1, 1);
tout0 = tin[0];
tout1 = tin[1];
l2c(tout0, out);
l2c(tout1, out);
}
iv1 = &(*ivec1)[0];
l2c(m0, iv1);
l2c(m1, iv1);
iv2 = &(*ivec2)[0];
l2c(tout0, iv2);
l2c(tout1, iv2);
} else {
register DES_LONG t0, t1;
c2l(iv1, m0);
c2l(iv1, m1);
c2l(iv2, xor0);
c2l(iv2, xor1);
for (l -= 8; l >= -7; l -= 8) {
tin[0] = m0;
tin[1] = m1;
DES_encrypt1(tin, ks3, 1);
m0 = tin[0];
m1 = tin[1];
c2l(in, tin0);
c2l(in, tin1);
t0 = tin0;
t1 = tin1;
tin[0] = tin0;
tin[1] = tin1;
DES_encrypt1(tin, ks1, 0);
tin[0] ^= m0;
tin[1] ^= m1;
DES_encrypt1(tin, ks2, 1);
tin[0] ^= m0;
tin[1] ^= m1;
DES_encrypt1(tin, ks1, 0);
tout0 = tin[0];
tout1 = tin[1];
tout0 ^= xor0;
tout1 ^= xor1;
if (l < 0) {
l2cn(tout0, tout1, out, l + 8);
} else {
l2c(tout0, out);
l2c(tout1, out);
}
xor0 = t0;
xor1 = t1;
}
iv1 = &(*ivec1)[0];
l2c(m0, iv1);
l2c(m1, iv1);
iv2 = &(*ivec2)[0];
l2c(xor0, iv2);
l2c(xor1, iv2);
}
tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
tin[0] = tin[1] = 0;
}
#endif