org.openmobster.core.common.Utilities.java Source code

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Here is the source code for org.openmobster.core.common.Utilities.java

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/**
 * Copyright (c) {2003,2011} {openmobster@gmail.com} {individual contributors as indicated by the @authors tag}.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */

package org.openmobster.core.common;

import java.rmi.server.UID;
import java.security.MessageDigest;

import org.apache.commons.codec.binary.Base64;

import org.openmobster.core.common.errors.SystemException;

/**
 * 
 * @author openmobster@gmail.com
 */
public class Utilities {
    /**
     * Randomly generates a unique identifier
     * 
     * @return the unique identifier
     */
    public static String generateUID() {
        String uid = null;

        UID cour = new UID();
        uid = String.valueOf(cour.toString());

        return uid;
    }

    /**
     * Performs Base64 encoding on the content of the byte array
     * 
     * @param data
     * @return String representation of the encoded byte array
     */
    public static String encodeBinaryData(byte[] data) {
        String encodedData = null;

        encodedData = new String(Base64.encodeBase64(data));

        return encodedData;
    }

    /**
     * Decodes a Base64 encoded String object
     * 
     * @param encodedData
     * @return Decoded data in the form of a byte array
     */
    public static byte[] decodeBinaryData(String encodedData) {
        byte[] binaryData = null;

        binaryData = Base64.decodeBase64(encodedData.getBytes());

        return binaryData;
    }

    public static String generateOneWayHash(String input, String knownSalt) {
        try {
            String onewayHash = null;

            MessageDigest digest = MessageDigest.getInstance("SHA-512");
            String randomSalt = Utilities.generateUID();
            byte[] hashBytes = digest.digest((knownSalt + randomSalt).getBytes());
            onewayHash = Utilities.encodeBinaryData(hashBytes);

            return onewayHash;
        } catch (Exception e) {
            throw new SystemException(e.getMessage(), e);
        }
    }
}