/* crypto/rc5/rc5_skey.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/rc5.h>

#include "rc5_locl.h"

void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,

                    int rounds)

{

    RC5_32_INT L[64], l, ll, A, B, *S, k;

    int i, j, m, c, t, ii, jj;

    if ((rounds != RC5_16_ROUNDS) &&

        (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS))

        rounds = RC5_16_ROUNDS;

    key->rounds = rounds;

    S = &(key->data[0]);

    j = 0;

    for (i = 0; i <= (len - 8); i += 8) {

        c2l(data, l);

        L[j++] = l;

        c2l(data, l);

        L[j++] = l;

    }

    ii = len - i;

    if (ii) {

        k = len & 0x07;

        c2ln(data, l, ll, k);

        L[j + 0] = l;

        L[j + 1] = ll;

    }

    c = (len + 3) / 4;

    t = (rounds + 1) * 2;

    S[0] = RC5_32_P;

    for (i = 1; i < t; i++)

        S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;

    j = (t > c) ? t : c;

    j *= 3;

    ii = jj = 0;

    A = B = 0;

    for (i = 0; i < j; i++) {

        k = (S[ii] + A + B) & RC5_32_MASK;

        A = S[ii] = ROTATE_l32(k, 3);

        m = (int)(A + B);

        k = (L[jj] + A + B) & RC5_32_MASK;

        B = L[jj] = ROTATE_l32(k, m);

        if (++ii >= t)

            ii = 0;

        if (++jj >= c)

            jj = 0;

    }

}