/* crypto/bf/bf_enc.c */

/* 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_locl.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

    register BF_LONG l, r;

    register 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

    register 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

    register BF_LONG l, r;

    register 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

    register 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)

{

    register BF_LONG tin0, tin1;

    register BF_LONG tout0, tout1, xor0, xor1;

    register 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