svn commit: rev 6804 - incubator/depot/trunk/ruper/src/java/core/org/apache/ruper/util/security

[mm...@apache.org]

Author: mmay
Date: Fri Feb 20 14:59:30 2004
New Revision: 6804

Added:
   incubator/depot/trunk/ruper/src/java/core/org/apache/ruper/util/security/ChkSum.java
Log:
Added to allow easy ChkSum generation and validation


Added: incubator/depot/trunk/ruper/src/java/core/org/apache/ruper/util/security/ChkSum.java
==============================================================================
--- (empty file)
+++ incubator/depot/trunk/ruper/src/java/core/org/apache/ruper/util/security/ChkSum.java	Fri Feb 20 14:59:30 2004
@@ -0,0 +1,267 @@
+/*
+ * Copyright  2004 The Apache Software Foundation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.apache.ruper.util.security;
+
+import java.io.File;
+import java.io.IOException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+
+import org.apache.ruper.RuperException;
+
+import org.apache.version.log.Logger;
+
+
+/**
+ * TODO mm Create Comment
+ *
+ * @author mmay
+ */
+public class ChkSum {
+    private String digestAlgorithm = null;
+    private String digestProvider = null;
+    private MessageDigest messageDigest = null;
+    private File hashCodeFile = null;
+    private File sourceFile = null;
+    private String genHashCode = null;
+    private String readHashCode = null;
+    private int buffersize = HashCodeManager.DEFAULT_BUFFERSIZE;
+
+    /**
+     * Constructs a new ChkSum Object
+     * Note, that the provider can be null
+     */
+    public ChkSum(String algorithm, String provider) {
+        this.digestAlgorithm = algorithm;
+        this.digestProvider = provider;
+    }
+
+    /**
+     * Creates a new ChkSum object.
+     * Convenience Constructor
+     *
+     * @param algorithm maybe MD5 or SHA or ???
+     */
+    public ChkSum(String algorithm) {
+        this(algorithm, null);
+    }
+
+    /**
+     * Creates a new ChkSum object with the Default Algorithm
+     * Convenience Constructor
+     * 
+     */
+    public ChkSum() {
+        this(HashCodeManager.DEFAULT_ALGORITHM, null);
+    }
+
+    /**
+     * TODO Add JavaDoc
+     *
+     * @return TODO
+     *
+     * @throws NoSuchAlgorithmException TODO
+     * @throws NoSuchProviderException TODO
+     */
+    public MessageDigest getDigest() throws NoSuchAlgorithmException, NoSuchProviderException {
+        if (this.messageDigest == null) {
+            this.messageDigest = HashCodeManager.createDigester(this.digestAlgorithm, this.digestProvider);
+        }
+
+        return this.messageDigest;
+    }
+
+    /**
+     * TODO Add JavaDoc
+     *
+     * @return TODO
+     */
+    private boolean validate() throws RuperException {
+    	boolean returnValue = false;
+    	
+    	Logger.getLogger().debug("Validating HashCode");
+
+        if ((this.sourceFile == null) || !this.sourceFile.exists()) {
+        			throw new RuperException("Cannot find " + sourceFile);
+        }
+
+        if ((this.hashCodeFile == null) || !this.hashCodeFile.exists()) {
+        			throw new RuperException("Cannot find " + hashCodeFile);
+        }
+
+        try {
+            byte[] checksum = HashCodeManager.getDigest(this.sourceFile, this.messageDigest, this.buffersize);
+            byte[] readChecksum = HashCodeManager.readHashFromFile(this.hashCodeFile);
+            
+            returnValue = HashCodeManager.compareHashes(checksum, readChecksum);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return returnValue;
+    }
+
+    /**
+     *
+     */
+    public void writeHashCodeToFile(File destination, byte[] digest) {
+    	Logger.getLogger().debug("Opening destination File");
+    	
+    	try {
+			HashCodeManager.writeHashToFile(destination, digest);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}    	
+    }
+
+    /**
+     * Generates a Checksum from a File
+     *
+     * @param source
+     *
+     * @return
+     */
+    private byte[] generateChecksum(File source) throws Exception {
+        return HashCodeManager.getDigest(source, this.messageDigest, this.buffersize);
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public String getDigestAlgorithm() {
+        return digestAlgorithm;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pString
+     */
+    public void setDigestAlgorithm(String pString) {
+        digestAlgorithm = pString;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public String getDigestProvider() {
+        return digestProvider;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pString
+     */
+    public void setDigestProvider(String pString) {
+        digestProvider = pString;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public String getGenHashCode() {
+        return genHashCode;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pString
+     */
+    public void setGenHashCode(String pString) {
+        genHashCode = pString;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public File getHashCodeFile() {
+        return hashCodeFile;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pFile
+     */
+    public void setHashCodeFile(File pFile) {
+        hashCodeFile = pFile;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public MessageDigest getMessageDigest() {
+        return messageDigest;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pDigest
+     */
+    public void setMessageDigest(MessageDigest pDigest) {
+        messageDigest = pDigest;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public String getReadHashCode() {
+        return readHashCode;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pString
+     */
+    public void setReadHashCode(String pString) {
+        readHashCode = pString;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @return
+     */
+    public File getSourceFile() {
+        return sourceFile;
+    }
+
+    /**
+     * TODO mm Create Comment
+     *
+     * @param pFile
+     */
+    public void setSourceFile(File pFile) {
+        sourceFile = pFile;
+    }
+}