/*
 * Copyright (c) 2011 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * 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 above 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. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
 */

#include "krb5_locl.h"


krb5_error_code
_krb5_fast_armor_key(krb5_context context,
		     krb5_keyblock *sessionkey,
		     krb5_keyblock *subkey,
		     krb5_keyblock *armorkey,
		     krb5_crypto *armor_crypto)
{
    krb5_crypto crypto_subkey, crypto_session;
    krb5_data pepper1, pepper2;
    krb5_error_code ret;

    ret = krb5_crypto_init(context, subkey, 0, &crypto_subkey);
    if (ret)
	return ret;

    ret = krb5_crypto_init(context, sessionkey, 0, &crypto_session);
    if (ret) {
	krb5_crypto_destroy(context, crypto_subkey);
	return ret;
    }

    pepper1.data = "subkeyarmor";
    pepper1.length = strlen(pepper1.data);
    pepper2.data = "ticketarmor";
    pepper2.length = strlen(pepper2.data);

    ret = krb5_crypto_fx_cf2(context, crypto_subkey, crypto_session,
			     &pepper1, &pepper2,
			     subkey->keytype,
			     armorkey);
    krb5_crypto_destroy(context, crypto_subkey);
    krb5_crypto_destroy(context, crypto_session);
    if (ret)
	return ret;

    ret = krb5_crypto_init(context, armorkey, 0, armor_crypto);
    if (ret)
	krb5_free_keyblock_contents(context, armorkey);

    return ret;
}