Author: markt
Date: Mon Oct 10 10:45:17 2011
New Revision: 1180870
URL: http://svn.apache.org/viewvc?rev=1180870&view=rev
Log:
Add initial implementation of a thread safe MessageDigest helper class
Added:
tomcat/trunk/java/org/apache/catalina/util/MsgDigest.java
Added: tomcat/trunk/java/org/apache/catalina/util/MsgDigest.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/util/MsgDigest.java?rev=1180870&view=auto
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/util/MsgDigest.java (added)
+++ tomcat/trunk/java/org/apache/catalina/util/MsgDigest.java Mon Oct 10
10:45:17 2011
@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.catalina.util;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+
+/**
+ * Helper class for generating message digests in multi-threaded environments.
+ */
+public class MsgDigest {
+
+ private static Helper md5 = new Helper("MD5");
+ private static Helper sha1 = new Helper("SHA1");
+
+ public static byte[] getMD5(byte[] input) {
+ return md5.digest(input);
+ }
+
+ public static byte[] getSHA1(byte[] input) {
+ return sha1.digest(input);
+ }
+
+ private static class Helper {
+
+ private final String digestName;
+ private final Queue<MessageDigest> digesters =
+ new ConcurrentLinkedQueue<MessageDigest>();
+
+ public Helper(String digestName) {
+ this.digestName = digestName;
+ }
+
+ public byte[] digest(byte[] input) {
+
+ // Get a digest from the queue
+ MessageDigest digest = digesters.poll();
+ if (digest == null) {
+ // Queue empty, create a new one
+ try {
+ digest = MessageDigest.getInstance(digestName);
+ } catch (NoSuchAlgorithmException e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
+
+ // Reset the digest before we use it
+ digest.reset();
+
+ // Create the digest for the provided input
+ digest.update(input);
+ byte[] result = digest.digest();
+
+ // Return the digester to the queue
+ digesters.add(digest);
+
+ return result;
+ }
+ }
+}
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