de.marx_labs.utilities.common.util.HashUtil.java Source code

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Here is the source code for de.marx_labs.utilities.common.util.HashUtil.java

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/**
 * Mad-Advertisement
 * Copyright (C) 2011-2013 Thorsten Marx <thmarx@gmx.net>
 *
 * 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 de.marx_labs.utilities.common.util;

import java.security.MessageDigest;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HashUtil {

    private static final Logger logger = LoggerFactory.getLogger(HashUtil.class);

    public static String hash(String value) {
        MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("SHA-256");
            digest.update(value.getBytes("UTF-8"));
            byte[] hash = digest.digest();

            return new String(hash);
        } catch (Exception e) {
            logger.error("", e);
        }
        return null;
    }

    public static String combine(String hash1, String hash2) {
        // return 1013 * (hash1.hashCode()) ^ 1009 * (hash2.hashCode());
        return new StringBuilder().append(hash1).append("#").append(hash2).toString();
    }

    public static String hmacSha1(String value, String key) {
        try {
            // Get an hmac_sha1 key from the raw key bytes
            byte[] keyBytes = key.getBytes();
            SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1");

            // Get an hmac_sha1 Mac instance and initialize with the signing key
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);

            // Compute the hmac on input data bytes
            byte[] rawHmac = mac.doFinal(value.getBytes());

            // Convert raw bytes to Hex
            byte[] hexBytes = new Hex().encode(rawHmac);

            // Covert array of Hex bytes to a String
            return new String(hexBytes, "UTF-8");
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}