helper.Digester.java Source code

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Here is the source code for helper.Digester.java

Source

/*
 * Copyright (C) 2012-2013 Martin Steiger
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package helper;

import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

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

import play.Configuration;
import play.Play;

/**
 * Digests string data in the form<br/>
 * result = Base64(SHA(str + application.secret))
 * @author Martin Steiger
 */
public class Digester {
    /**
     * @param str the input string
     * @return the digested string
     * @throws NoSuchAlgorithmException encryption algorithm not installed 
     */
    public static String digest(String str) throws NoSuchAlgorithmException {
        Configuration config = Play.application().configuration();

        String salt = config.getString("application.secret");

        String saltedStr = str + salt;

        MessageDigest md = MessageDigest.getInstance("SHA");
        md.update(saltedStr.getBytes());

        byte byteData[] = md.digest();

        byte[] base64 = Base64.encodeBase64(byteData);

        String result = new String(base64, Charset.defaultCharset());

        return result;
    }
}