001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.core.security;
066:
067: import com.jcorporate.expresso.kernel.exception.ChainedException;
068: import org.apache.log4j.Logger;
069:
070: import java.security.MessageDigest;
071: import java.security.NoSuchAlgorithmException;
072:
073: /**
074: * Base class for hashing. Takes a string or byte array and returns a
075: * byte array that's the hash of the encryption.
076: *
077: * @author Michael Rimov
078: */
079: public final class StringHash {
080: private static final String this Class = "com.jcorporate.expresso.core.security.strongencryption.StringHash";
081: private MessageDigest sha;
082: static Logger logCat = Logger.getLogger(StringHash.class);
083: private CryptoManager cryptoManager;
084:
085: /**
086: * @throws ChainedException
087: */
088: public StringHash() throws ChainedException {
089: try {
090: sha = MessageDigest.getInstance("SHA");
091: logCat
092: .debug("StringHash initialized and SHA-1 algorithm loaded");
093: } catch (NoSuchAlgorithmException ex) {
094: logCat.error("Unable to load SHA-1 Hash Algorithm", ex);
095: throw new ChainedException(this Class + ".StringHash()"
096: + ":Error loading SHA-1 Algorithm."
097: + " You may not have installed the"
098: + " Cryptography Extensions Properly:", ex);
099: }
100: } /* StringHash() */
101:
102: /**
103: * Produces a strong cryptographic hash.
104: *
105: * @param inputData The data to produce the Hash for
106: * @return A byte array representing the hashed input data.
107: */
108: public byte[] produceHash(byte[] inputData) throws ChainedException {
109: final String myName = this Class + ".produceHash(byte)";
110:
111: if (inputData.length == 0) {
112: throw new IllegalArgumentException(myName
113: + " inputData's length must not be zero");
114: }
115: if (logCat.isDebugEnabled()) {
116: logCat.debug("Producing a hash for the data: "
117: + new String(inputData));
118: }
119:
120: return sha.digest(inputData);
121: }
122:
123: public void setCryptoManager(CryptoManager cryptoManager) {
124: this .cryptoManager = cryptoManager;
125: }
126:
127: public CryptoManager getCryptoManager() {
128: return cryptoManager;
129: } /* produceHash(byte) */
130:
131: } /* StringHash */
132:
133: /* StringHash */
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