/* $OpenBSD: bf_enc.c,v 1.9 2022/11/26 16:08:51 tb 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 <openssl/blowfish.h>

#include "bf_local.h"

/*
 * Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
 * (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
 */

#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
#error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
to modify the code.
#endif

void
BF_encrypt(BF_LONG *data, const BF_KEY *key)
{
#ifndef BF_PTR2
	BF_LONG l, r;
	const BF_LONG *p, *s;

	p = key->P;
	s = &(key->S[0]);
	l = data[0];
	r = data[1];

	l ^= p[0];
	BF_ENC(r, l,s, p[1]);
	BF_ENC(l, r,s, p[2]);
	BF_ENC(r, l,s, p[3]);
	BF_ENC(l, r,s, p[4]);
	BF_ENC(r, l,s, p[5]);
	BF_ENC(l, r,s, p[6]);
	BF_ENC(r, l,s, p[7]);
	BF_ENC(l, r,s, p[8]);
	BF_ENC(r, l,s, p[9]);
	BF_ENC(l, r,s, p[10]);
	BF_ENC(r, l,s, p[11]);
	BF_ENC(l, r,s, p[12]);
	BF_ENC(r, l,s, p[13]);
	BF_ENC(l, r,s, p[14]);
	BF_ENC(r, l,s, p[15]);
	BF_ENC(l, r,s, p[16]);
#if BF_ROUNDS == 20
	BF_ENC(r, l,s, p[17]);
	BF_ENC(l, r,s, p[18]);
	BF_ENC(r, l,s, p[19]);
	BF_ENC(l, r,s, p[20]);
#endif
	r ^= p[BF_ROUNDS + 1];

	data[1] = l&0xffffffffL;
	data[0] = r&0xffffffffL;
#else
	BF_LONG l, r,t, *k;

	l = data[0];
	r = data[1];
	k = (BF_LONG*)key;

	l ^= k[0];
	BF_ENC(r, l, k, 1);
	BF_ENC(l, r, k, 2);
	BF_ENC(r, l, k, 3);
	BF_ENC(l, r, k, 4);
	BF_ENC(r, l, k, 5);
	BF_ENC(l, r, k, 6);
	BF_ENC(r, l, k, 7);
	BF_ENC(l, r, k, 8);
	BF_ENC(r, l, k, 9);
	BF_ENC(l, r,k, 10);
	BF_ENC(r, l,k, 11);
	BF_ENC(l, r,k, 12);
	BF_ENC(r, l,k, 13);
	BF_ENC(l, r,k, 14);
	BF_ENC(r, l,k, 15);
	BF_ENC(l, r,k, 16);
#if BF_ROUNDS == 20
	BF_ENC(r, l,k, 17);
	BF_ENC(l, r,k, 18);
	BF_ENC(r, l,k, 19);
	BF_ENC(l, r,k, 20);
#endif
	r ^= k[BF_ROUNDS + 1];

	data[1] = l&0xffffffffL;
	data[0] = r&0xffffffffL;
#endif
}

#ifndef BF_DEFAULT_OPTIONS

void
BF_decrypt(BF_LONG *data, const BF_KEY *key)
{
#ifndef BF_PTR2
	BF_LONG l, r;
	const BF_LONG *p, *s;

	p = key->P;
	s = &(key->S[0]);
	l = data[0];
	r = data[1];

	l ^= p[BF_ROUNDS + 1];
#if BF_ROUNDS == 20
	BF_ENC(r, l,s, p[20]);
	BF_ENC(l, r,s, p[19]);
	BF_ENC(r, l,s, p[18]);
	BF_ENC(l, r,s, p[17]);
#endif
	BF_ENC(r, l,s, p[16]);
	BF_ENC(l, r,s, p[15]);
	BF_ENC(r, l,s, p[14]);
	BF_ENC(l, r,s, p[13]);
	BF_ENC(r, l,s, p[12]);
	BF_ENC(l, r,s, p[11]);
	BF_ENC(r, l,s, p[10]);
	BF_ENC(l, r,s, p[9]);
	BF_ENC(r, l,s, p[8]);
	BF_ENC(l, r,s, p[7]);
	BF_ENC(r, l,s, p[6]);
	BF_ENC(l, r,s, p[5]);
	BF_ENC(r, l,s, p[4]);
	BF_ENC(l, r,s, p[3]);
	BF_ENC(r, l,s, p[2]);
	BF_ENC(l, r,s, p[1]);
	r ^= p[0];

	data[1] = l&0xffffffffL;
	data[0] = r&0xffffffffL;
#else
	BF_LONG l, r,t, *k;

	l = data[0];
	r = data[1];
	k = (BF_LONG *)key;

	l ^= k[BF_ROUNDS + 1];
#if BF_ROUNDS == 20
	BF_ENC(r, l,k, 20);
	BF_ENC(l, r,k, 19);
	BF_ENC(r, l,k, 18);
	BF_ENC(l, r,k, 17);
#endif
	BF_ENC(r, l,k, 16);
	BF_ENC(l, r,k, 15);
	BF_ENC(r, l,k, 14);
	BF_ENC(l, r,k, 13);
	BF_ENC(r, l,k, 12);
	BF_ENC(l, r,k, 11);
	BF_ENC(r, l,k, 10);
	BF_ENC(l, r, k, 9);
	BF_ENC(r, l, k, 8);
	BF_ENC(l, r, k, 7);
	BF_ENC(r, l, k, 6);
	BF_ENC(l, r, k, 5);
	BF_ENC(r, l, k, 4);
	BF_ENC(l, r, k, 3);
	BF_ENC(r, l, k, 2);
	BF_ENC(l, r, k, 1);
	r ^= k[0];

	data[1] = l&0xffffffffL;
	data[0] = r&0xffffffffL;
#endif
}

void
BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
    const BF_KEY *schedule, unsigned char *ivec, int encrypt)
{
	BF_LONG tin0, tin1;
	BF_LONG tout0, tout1, xor0, xor1;
	long l = length;
	BF_LONG tin[2];

	if (encrypt) {
		n2l(ivec, tout0);
		n2l(ivec, tout1);
		ivec -= 8;
		for (l -= 8; l >= 0; l -= 8) {
			n2l(in, tin0);
			n2l(in, tin1);
			tin0 ^= tout0;
			tin1 ^= tout1;
			tin[0] = tin0;
			tin[1] = tin1;
			BF_encrypt(tin, schedule);
			tout0 = tin[0];
			tout1 = tin[1];
			l2n(tout0, out);
			l2n(tout1, out);
		}
		if (l != -8) {
			n2ln(in, tin0, tin1, l + 8);
			tin0 ^= tout0;
			tin1 ^= tout1;
			tin[0] = tin0;
			tin[1] = tin1;
			BF_encrypt(tin, schedule);
			tout0 = tin[0];
			tout1 = tin[1];
			l2n(tout0, out);
			l2n(tout1, out);
		}
		l2n(tout0, ivec);
		l2n(tout1, ivec);
	} else {
		n2l(ivec, xor0);
		n2l(ivec, xor1);
		ivec -= 8;
		for (l -= 8; l >= 0; l -= 8) {
			n2l(in, tin0);
			n2l(in, tin1);
			tin[0] = tin0;
			tin[1] = tin1;
			BF_decrypt(tin, schedule);
			tout0 = tin[0]^xor0;
			tout1 = tin[1]^xor1;
			l2n(tout0, out);
			l2n(tout1, out);
			xor0 = tin0;
			xor1 = tin1;
		}
		if (l != -8) {
			n2l(in, tin0);
			n2l(in, tin1);
			tin[0] = tin0;
			tin[1] = tin1;
			BF_decrypt(tin, schedule);
			tout0 = tin[0]^xor0;
			tout1 = tin[1]^xor1;
			l2nn(tout0, tout1, out, l + 8);
			xor0 = tin0;
			xor1 = tin1;
		}
		l2n(xor0, ivec);
		l2n(xor1, ivec);
	}
	tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
	tin[0] = tin[1] = 0;
}

#endif
