net.nicholaswilliams.java.licensing.encryption.Hasher.java Source code

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Here is the source code for net.nicholaswilliams.java.licensing.encryption.Hasher.java

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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.");
    }
}