// $Id: Skein256.java 253 2011-06-07 18:33:10Z tp $

package fr.cryptohash;

/**
 * <p>This class implements the Skein-256 digest algorithm under the
 * {@link Digest} API. In the Skein specification, that function is
 * called under the full name "Skein-512-256".</p>
 *
 * <pre>
 * ==========================(LICENSE BEGIN)============================
 *
 * Copyright (c) 2007-2010  Projet RNRT SAPHIR
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * ===========================(LICENSE END)=============================
 * </pre>
 *
 * @version   $Revision: 253 $
 * @author    Thomas Pornin <thomas.pornin@cryptolog.com>
 */

public class Skein256 extends SkeinBigCore {

	/**
	 * Create the engine.
	 */
	public Skein256()
	{
		super();
	}

	/** The initial value for Skein-256. */
	private static final long[] initVal = {
		0xCCD044A12FDB3E13L, 0xE83590301A79A9EBL,
		0x55AEA0614F816E6FL, 0x2A2767A4AE9B94DBL,
		0xEC06025E74DD7683L, 0xE7A436CDC4746251L,
		0xC36FBAF9393AD185L, 0x3EEDBA1833EDFC13L
	};

	/** @see SkeinBigCore */
	long[] getInitVal()
	{
		return initVal;
	}

	/** @see Digest */
	public int getDigestLength()
	{
		return 32;
	}

	/** @see SkeinBigCore */
	SkeinBigCore dup()
	{
		return new Skein256();
	}
}