/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
package at.gv.egiz.pdfas.web.helper;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.binary.Hex;

public class DigestHelper {

	public static final String SHA1 = "SHA-1";
	public static final String SHA224 = "SHA-224";
	public static final String SHA256 = "SHA-256";
	public static final String SHA384 = "SHA-384";
	public static final String SHA512 = "SHA-512";
	
	public static String DefaulAlgorithm = SHA256;
	
	public static String getHexEncodedHash(byte[] data) throws NoSuchAlgorithmException {
		return getHexEncodedHash(data, DefaulAlgorithm);
	}
	
	public static String getHexEncodedHash(byte[] data, String algorithm) throws NoSuchAlgorithmException {
		MessageDigest md = MessageDigest.getInstance(algorithm);
		byte[] hash = md.digest(data);
		return Hex.encodeHexString(hash);
	}
}