// $Id: SHA256.java 156 2010-04-26 17:55:11Z tp $

package fr.cryptohash;

/**
 * <p>This class implements the SHA-256 digest algorithm under the
 * {@link Digest} API. SHA-256 is specified by FIPS 180-2.</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: 156 $
 * @author    Thomas Pornin &lt;thomas.pornin@cryptolog.com&gt;
 */

public class SHA256 extends SHA2Core {

	/**
	 * Create the engine.
	 */
	public SHA256()
	{
		super();
	}

	/** The initial value for SHA-256. */
	private static final int[] initVal = {
		0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
		0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
	};

	/** @see SHA2Core */
	int[] getInitVal()
	{
		return initVal;
	}

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

	/** @see Digest */
	public Digest copy()
	{
		return copyState(new SHA256());
	}
}