001    /**
002     * Copyright (c) 2000-2011 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.util;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.util.Base64;
020    import com.liferay.portal.kernel.util.Digester;
021    import com.liferay.portal.kernel.util.StringBundler;
022    import com.liferay.portal.kernel.util.StringPool;
023    
024    import java.io.UnsupportedEncodingException;
025    
026    import java.security.MessageDigest;
027    import java.security.NoSuchAlgorithmException;
028    
029    import org.apache.commons.codec.binary.Hex;
030    
031    /**
032     * @author Brian Wing Shun Chan
033     * @author Alexander Chow
034     */
035    public class DigesterImpl implements Digester {
036    
037            public String digest(String text) {
038                    return digest(Digester.DEFAULT_ALGORITHM, text);
039            }
040    
041            public String digest(String algorithm, String... text) {
042                    if (_BASE_64) {
043                            return digestBase64(algorithm, text);
044                    }
045                    else {
046                            return digestHex(algorithm, text);
047                    }
048            }
049    
050            public String digestBase64(String text) {
051                    return digestBase64(Digester.DEFAULT_ALGORITHM, text);
052            }
053    
054            public String digestBase64(String algorithm, String... text) {
055                    byte[] bytes = digestRaw(algorithm, text);
056    
057                    return Base64.encode(bytes);
058            }
059    
060            public String digestHex(String text) {
061                    return digestHex(Digester.DEFAULT_ALGORITHM, text);
062            }
063    
064            public String digestHex(String algorithm, String... text) {
065                    byte[] bytes = digestRaw(algorithm, text);
066    
067                    return Hex.encodeHexString(bytes);
068            }
069    
070            public byte[] digestRaw(String text) {
071                    return digestRaw(Digester.DEFAULT_ALGORITHM, text);
072            }
073    
074            public byte[] digestRaw(String algorithm, String... text) {
075                    MessageDigest messageDigest = null;
076    
077                    try{
078                            messageDigest = MessageDigest.getInstance(algorithm);
079    
080                            StringBundler sb = new StringBundler(text.length * 2 - 1);
081    
082                            for (String t : text) {
083                                    if (sb.length() > 0) {
084                                            sb.append(StringPool.COLON);
085                                    }
086    
087                                    sb.append(t);
088                            }
089    
090                            String s = sb.toString();
091    
092                            messageDigest.update(s.getBytes(Digester.ENCODING));
093                    }
094                    catch (NoSuchAlgorithmException nsae) {
095                            _log.error(nsae, nsae);
096                    }
097                    catch (UnsupportedEncodingException uee) {
098                            _log.error(uee, uee);
099                    }
100    
101                    return messageDigest.digest();
102            }
103    
104            private static final boolean _BASE_64 =
105                    PropsValues.PASSWORDS_DIGEST_ENCODING.equals("base64");
106    
107            private static Log _log = LogFactoryUtil.getLog(Digester.class);
108    
109    }