com.liferay.util.Encryptor.java Source code

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Here is the source code for com.liferay.util.Encryptor.java

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/**
 * Copyright (c) 2000-2005 Liferay, LLC. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.liferay.util;

import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.dotmarketing.util.Logger;

/**
 * <a href="Encryptor.java.html"><b><i>View Source</i></b></a>
 *
 * @author  Brian Wing Shun Chan
 * @version $Revision: 1.13 $
 *
 */
public class Encryptor {

    public static final String ENCODING = "UTF8";

    public static final String DIGEST_ALGORITHM = "SHA";

    public static final String KEY_ALGORITHM = "DES";

    public static final String SUN_PROVIDER_CLASS = "com.sun.crypto.provider.SunJCE";

    public static final String IBM_PROVIDER_CLASS = "com.ibm.crypto.provider.IBMJCE";

    public static final String PROVIDER_CLASS = GetterUtil
            .get(SystemProperties.get(Encryptor.class.getName() + ".provider.class"), SUN_PROVIDER_CLASS);

    public static Key generateKey() throws EncryptorException {
        return generateKey(KEY_ALGORITHM);
    }

    public static Key generateKey(String algorithm) throws EncryptorException {
        try {
            Security.addProvider(getProvider());

            KeyGenerator generator = KeyGenerator.getInstance(algorithm);
            generator.init(56, new SecureRandom());

            Key key = generator.generateKey();

            return key;
        } catch (Exception e) {
            throw new EncryptorException(e);
        }
    }

    public static Provider getProvider()
            throws ClassNotFoundException, IllegalAccessException, InstantiationException {

        Class providerClass = null;

        try {
            providerClass = Class.forName(PROVIDER_CLASS);
        } catch (ClassNotFoundException cnfe) {
            if ((ServerDetector.isWebSphere()) && (PROVIDER_CLASS.equals(SUN_PROVIDER_CLASS))) {

                _log.warn("WebSphere does not have " + SUN_PROVIDER_CLASS + ", using " + IBM_PROVIDER_CLASS
                        + " instead");

                providerClass = Class.forName(IBM_PROVIDER_CLASS);
            } else {
                throw cnfe;
            }
        }

        return (Provider) providerClass.newInstance();
    }

    public static String decrypt(Key key, String encryptedString) throws EncryptorException {

        try {
            Security.addProvider(getProvider());

            Cipher cipher = Cipher.getInstance(key.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, key);

            byte[] encryptedBytes = Base64.decode(encryptedString);
            byte[] decryptedBytes = cipher.doFinal(encryptedBytes);

            String decryptedString = new String(decryptedBytes, ENCODING);

            return decryptedString;
        } catch (Exception e) {
            throw new EncryptorException(e);
        }
    }

    public static String digest(String text) {
        return digest(DIGEST_ALGORITHM, text);
    }

    public static String digest(String algorithm, String text) {
        MessageDigest mDigest = null;

        try {
            mDigest = MessageDigest.getInstance(algorithm);

            mDigest.update(text.getBytes(ENCODING));
        } catch (NoSuchAlgorithmException nsae) {
            Logger.error(Encryptor.class, nsae.getMessage(), nsae);

        } catch (UnsupportedEncodingException uee) {
            Logger.error(Encryptor.class, uee.getMessage(), uee);
        }

        byte raw[] = mDigest.digest();

        return Base64.encode(raw);
    }

    public static String encrypt(Key key, String plainText) throws EncryptorException {

        try {
            Security.addProvider(getProvider());

            Cipher cipher = Cipher.getInstance(key.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, key);

            byte[] decryptedBytes = plainText.getBytes(ENCODING);
            byte[] encryptedBytes = cipher.doFinal(decryptedBytes);

            String encryptedString = Base64.encode(encryptedBytes);

            return encryptedString;
        } catch (Exception e) {
            throw new EncryptorException(e);
        }
    }

    private static final Log _log = LogFactory.getLog(Encryptor.class);

}