001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.security.pwd;
016    
017    import com.liferay.portal.PwdEncryptorException;
018    import com.liferay.portal.kernel.util.ArrayUtil;
019    import com.liferay.portal.kernel.util.Digester;
020    import com.liferay.portal.kernel.util.Validator;
021    
022    import java.io.UnsupportedEncodingException;
023    
024    import java.util.Random;
025    
026    import org.vps.crypt.Crypt;
027    
028    /**
029     * @author Michael C. Han
030     * @author Tomas Polesovsky
031     */
032    public class CryptPasswordEncryptor
033            extends BasePasswordEncryptor implements PasswordEncryptor {
034    
035            @Override
036            @SuppressWarnings("deprecation")
037            public String[] getSupportedAlgorithmTypes() {
038                    return new String[] {
039                            PasswordEncryptorUtil.TYPE_CRYPT,
040                            PasswordEncryptorUtil.TYPE_UFC_CRYPT
041                    };
042            }
043    
044            @Override
045            protected String doEncrypt(
046                            String algorithm, String plainTextPassword,
047                            String encryptedPassword)
048                    throws PwdEncryptorException {
049    
050                    byte[] saltBytes = getSalt(encryptedPassword);
051    
052                    try {
053                            return Crypt.crypt(
054                                    saltBytes, plainTextPassword.getBytes(Digester.ENCODING));
055                    }
056                    catch (UnsupportedEncodingException uee) {
057                            throw new PwdEncryptorException(uee.getMessage(), uee);
058                    }
059            }
060    
061            protected byte[] getSalt(String encryptedPassword)
062                    throws PwdEncryptorException {
063    
064                    byte[] saltBytes = null;
065    
066                    try {
067                            if (Validator.isNull(encryptedPassword)) {
068                                    Random random = new Random();
069    
070                                    int x = random.nextInt(Integer.MAX_VALUE) % _SALT.length;
071                                    int y = random.nextInt(Integer.MAX_VALUE) % _SALT.length;
072    
073                                    String salt = _SALT[x].concat(_SALT[y]);
074    
075                                    saltBytes = salt.getBytes(Digester.ENCODING);
076                            }
077                            else {
078                                    String salt = encryptedPassword.substring(0, 2);
079    
080                                    saltBytes = salt.getBytes(Digester.ENCODING);
081                            }
082                    }
083                    catch (UnsupportedEncodingException uee) {
084                            throw new PwdEncryptorException(
085                                    "Unable to extract salt from encrypted password " +
086                                            uee.getMessage(),
087                                    uee);
088                    }
089    
090                    return saltBytes;
091            }
092    
093            private static final String[] _SALT = ArrayUtil.toStringArray(
094                    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./".
095                            toCharArray());
096    
097    }