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/* $OpenBSD: pcbc_enc.c,v 1.10 2024/03/29 01:47:29 joshua Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* 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@cryptsoft.com).
*
* 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@cryptsoft.com)"
* 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@cryptsoft.com)"
*
* 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_local.h"
void
DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
long length, DES_key_schedule *schedule,
DES_cblock *ivec, int enc)
{
DES_LONG sin0, sin1, xor0, xor1, tout0, tout1;
DES_LONG tin[2];
const unsigned char *in;
unsigned char *out, *iv;
in = input;
out = output;
iv = &(*ivec)[0];
if (enc) {
c2l(iv, xor0);
c2l(iv, xor1);
for (; length > 0; length -= 8) {
if (length >= 8) {
c2l(in, sin0);
c2l(in, sin1);
} else
c2ln(in, sin0, sin1, length);
tin[0] = sin0 ^ xor0;
tin[1] = sin1 ^ xor1;
DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
tout0 = tin[0];
tout1 = tin[1];
xor0 = sin0 ^ tout0;
xor1 = sin1 ^ tout1;
l2c(tout0, out);
l2c(tout1, out);
}
} else {
c2l(iv, xor0);
c2l(iv, xor1);
for (; length > 0; length -= 8) {
c2l(in, sin0);
c2l(in, sin1);
tin[0] = sin0;
tin[1] = sin1;
DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
if (length >= 8) {
l2c(tout0, out);
l2c(tout1, out);
} else
l2cn(tout0, tout1, out, length);
xor0 = tout0 ^ sin0;
xor1 = tout1 ^ sin1;
}
}
tin[0] = tin[1] = 0;
sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0;
}
LCRYPTO_ALIAS(DES_pcbc_encrypt);
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