CryptoUtils.java

/*******************************************************************************
 * Copyright (c) 2006-2013, Cloudsmith Inc.
 * The code, documentation and other materials contained herein have been
 * licensed under the Eclipse Public License - v 1.0 by the copyright holder
 * listed above, as the Initial Contributor under such license. The text of
 * such license is available at www.eclipse.org.
 ******************************************************************************/

package org.eclipse.buckminster.core.helpers;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.eclipse.buckminster.core.Messages;
import org.eclipse.osgi.util.NLS;

/**
 * Cryptology utils
 * 
 * @author Karel Brezina
 * 
 */
public class CryptoUtils {
	private static String ENCODING_UTF8 = "UTF-8"; //$NON-NLS-1$

	/**
	 * Encrypts an input byte array using a given algorithm
	 * 
	 * @param input
	 * @param algorithmName
	 * @return
	 */
	public static String encrypt(byte[] bytes, String algorithmName) {
		String md5val = ""; //$NON-NLS-1$
		MessageDigest algorithm = null;

		try {
			algorithm = MessageDigest.getInstance(algorithmName);
		} catch (NoSuchAlgorithmException nsae) {
			throw new IllegalArgumentException(NLS.bind(Messages.Unknown_encrypt_algorithm_0, algorithmName));
		}

		algorithm.reset();
		algorithm.update(bytes);
		byte messageDigest[] = algorithm.digest();
		StringBuffer hexString = new StringBuffer();

		for (int i = 0; i < messageDigest.length; i++) {
			String hex = Integer.toHexString(0xFF & messageDigest[i]);
			if (hex.length() == 1) {
				hexString.append('0');
			}
			hexString.append(hex);
		}
		md5val = hexString.toString();
		return md5val;
	}

	/**
	 * Encrypts an input string using a given algorithm
	 * 
	 * @param input
	 * @param algorithmName
	 * @return
	 */
	public static String encrypt(String input, String algorithmName) {
		return encrypt(input, ENCODING_UTF8, algorithmName);
	}

	/**
	 * Encrypts an input string using a given algorithm
	 * 
	 * @param input
	 * @param encodingCharsetName
	 * @param algorithmName
	 * @return
	 */
	public static String encrypt(String input, String encodingCharsetName, String algorithmName) {
		try {
			return encrypt(input.getBytes(encodingCharsetName), algorithmName);
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException(NLS.bind(Messages.Internal_error_0_is_not_supported_encoding, ENCODING_UTF8), e);
		}
	}

}