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/* crypto/des/ncbc_enc.c */
/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@mincom.oz.au).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@mincom.oz.au).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@mincom.oz.au)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include "des_locl.h"
void des_ncbc_encrypt(input, output, length, schedule, ivec, encrypt)
des_cblock (*input);
des_cblock (*output);
long length;
des_key_schedule schedule;
des_cblock (*ivec);
int encrypt;
{
register DES_LONG tin0,tin1;
register DES_LONG tout0,tout1,xor0,xor1;
register unsigned char *in,*out;
register long l=length;
DES_LONG tin[2];
unsigned char *iv;
in=(unsigned char *)input;
out=(unsigned char *)output;
iv=(unsigned char *)ivec;
if (encrypt)
{
c2l(iv,tout0);
c2l(iv,tout1);
for (l-=8; l>=0; l-=8)
{
c2l(in,tin0);
c2l(in,tin1);
tin0^=tout0; tin[0]=tin0;
tin1^=tout1; tin[1]=tin1;
des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
tout0=tin[0]; l2c(tout0,out);
tout1=tin[1]; l2c(tout1,out);
}
if (l != -8)
{
c2ln(in,tin0,tin1,l+8);
tin0^=tout0; tin[0]=tin0;
tin1^=tout1; tin[1]=tin1;
des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
tout0=tin[0]; l2c(tout0,out);
tout1=tin[1]; l2c(tout1,out);
}
iv=(unsigned char *)ivec;
l2c(tout0,iv);
l2c(tout1,iv);
}
else
{
c2l(iv,xor0);
c2l(iv,xor1);
for (l-=8; l>=0; l-=8)
{
c2l(in,tin0); tin[0]=tin0;
c2l(in,tin1); tin[1]=tin1;
des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
tout0=tin[0]^xor0;
tout1=tin[1]^xor1;
l2c(tout0,out);
l2c(tout1,out);
xor0=tin0;
xor1=tin1;
}
if (l != -8)
{
c2l(in,tin0); tin[0]=tin0;
c2l(in,tin1); tin[1]=tin1;
des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
tout0=tin[0]^xor0;
tout1=tin[1]^xor1;
l2cn(tout0,tout1,out,l+8);
xor0=tin0;
xor1=tin1;
}
iv=(unsigned char *)ivec;
l2c(xor0,iv);
l2c(xor1,iv);
}
tin0=tin1=tout0=tout1=xor0=xor1=0;
tin[0]=tin[1]=0;
}
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