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/*
 * Hasher.java from LicenseManager modified Monday, April 8, 2013 12:11:51 CDT (-0500).
 *
 * Copyright 2010-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.nicholaswilliams.java.licensing.encryption;

import net.nicholaswilliams.java.licensing.LicensingCharsets;
import net.nicholaswilliams.java.licensing.exception.AlgorithmNotSupportedException;
import org.apache.commons.codec.binary.Base64;

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

/**
 * Used for creating hash keys of things that won't need to be unencrypted.
 *
 * @author Nick Williams
 * @version 1.0.0
 * @since 1.0.0
 */
public class Hasher
{
	/**
	 * The algorithm we use to hash strings.
	 */
	private static final String algorithm = "SHA-512";

	/**
	 * The salt that we use to hash strings.
	 */
	private static final String salt =
			"j4KgU305PZp't.\"%ordAY7q*?z9%8]amNL(0Wx5eG49b1sRj(^;8Kg2w0EoM";

	/**
	 * Calculate the SHA-512 message digest hash of the
	 * provided string and return it with its binary
	 * data Base64 encoded.
	 *
	 * @param string The string to hash
	 * @return the hashed string Base64 encoded.
	 */
	public static String hash(String string)
	{
		try
		{
			return new String(
					Base64.encodeBase64(
							MessageDigest.getInstance(Hasher.algorithm).digest(
									(string + Hasher.salt).getBytes(LicensingCharsets.UTF_8)
							)
					),
					LicensingCharsets.UTF_8
			);
		}
		catch(NoSuchAlgorithmException e)
		{
			throw new AlgorithmNotSupportedException(Hasher.algorithm, e);
		}
	}

	/**
	 * This class cannot be instantiated.
	 */
	private Hasher()
	{
		throw new RuntimeException("This class cannot be instantiated.");
	}
}