Cripto.java

/*******************************************************************************
 * This file is part of OpenNMS(R).
 *
 * Copyright (C) 2009-2011 The OpenNMS Group, Inc.
 * OpenNMS(R) is Copyright (C) 1999-2011 The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
 *
 * OpenNMS(R) 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.
 *
 * OpenNMS(R) 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 OpenNMS(R).  If not, see:
 *      http://www.gnu.org/licenses/
 *
 * For more information contact:
 *     OpenNMS(R) Licensing <license@opennms.org>
 *     http://www.opennms.org/
 *     http://www.opennms.com/
 *
 * From the original copyright headers:
 *
 * Copyright (c) 2009+ desmax74
 * Copyright (c) 2009+ The OpenNMS Group, Inc.
 *
 * This program was developed and is maintained by Rocco RIONERO
 * ("the author") and is subject to dual-copyright according to
 * the terms set in "The OpenNMS Project Contributor Agreement".
 *
 * The author can be contacted at the following email address:
 *
 *     Massimiliano Dessì
 *     desmax74@yahoo.it
 *******************************************************************************/

package org.opennms.acl.util;

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

/**
 * Util class to encript a password
 *
 * @author Massimiliano Dessì (desmax74@yahoo.it)
 * @since jdk 1.5.0
 * @version $Id: $
 */
public class Cripto {

    /**
     * <p>stringToSHA</p>
     *
     * @param buffer a {@link java.lang.String} object.
     * @return a {@link java.lang.String} object.
     */
    public static String stringToSHA(String buffer) {
        try {
            MessageDigest shaDigest = MessageDigest.getInstance(Constants.ALGORITHM_SHA);
            byte[] mybytes = buffer.getBytes();
            byte[] byteResult = shaDigest.digest(mybytes);
            return bytesToHex(byteResult);
        } catch (NoSuchAlgorithmException shaex) {
            return null;
        }

    }

    private static String bytesToHex(byte[] b) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < b.length; ++i) {
            sb.append((Integer.toHexString((b[i] & 0xFF) | 0x100)).substring(1, 3));
        }
        return sb.toString();
    }

}