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	/*
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* (C) Copyright IBM Corp. 1999 All Rights Reserved.
	* Copyright 1997 The Open Group Research Institute. All rights reserved.
	*/

	package sun.security.krb5.internal.crypto;

	import sun.security.krb5.Checksum;
	import sun.security.krb5.KrbCryptoException;
	import sun.security.krb5.internal.*;
	import java.security.MessageDigest;

	public final class RsaMd5CksumType extends CksumType {

	public RsaMd5CksumType() {
	}

	public int confounderSize() {
	return 0;
	}

	public int cksumType() {
	return Checksum.CKSUMTYPE_RSA_MD5;
	}

	public boolean isKeyed() {
	return false;
	}

	public int cksumSize() {
	return 16;
	}

	public int keyType() {
	return Krb5.KEYTYPE_NULL;
	}

	public int keySize() {
	return 0;
	}

	/**
	* Calculates checksum using MD5.
	* @param data the data used to generate the checksum.
	* @param size length of the data.
	* @return the checksum.
	*
	* @modified by Yanni Zhang, 12/08/99.
	*/

	public byte[] calculateChecksum(byte[] data, int size,
	byte[] key, int usage) throws KrbCryptoException{
	MessageDigest md5;
	byte[] result = null;
	try {
	md5 = MessageDigest.getInstance("MD5");
	} catch (Exception e) {
	throw new KrbCryptoException("JCE provider may not be installed. " + e.getMessage());
	}
	try {
	md5.update(data);
	result = md5.digest();
	} catch (Exception e) {
	throw new KrbCryptoException(e.getMessage());
	}
	return result;
	}

	@Override
	public boolean verifyChecksum(byte[] data, int size,
	byte[] key, byte[] checksum, int usage)
	throws KrbCryptoException {
	try {
	byte[] calculated = MessageDigest.getInstance("MD5").digest(data);
	return CksumType.isChecksumEqual(calculated, checksum);
	} catch (Exception e) {
	return false;
	}
	}
	}

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