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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * 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.xml.security.utils;

import java.io.IOException;
import java.io.OutputStream;

/**
 * A class that buffers without synchronizing its methods
 * @author raul
 */
public class UnsyncBufferedOutputStream extends OutputStream {
    static final int size = 8*1024;
    private static ThreadLocal bufCache = new ThreadLocal() {
        @Override
        protected synchronized byte[] initialValue() {
            return new byte[size];
        }
    };
    
    int pointer = 0;
    final OutputStream out;

    final byte[] buf;
    
    /**
     * Creates a buffered output stream without synchronization
     * @param out the outputstream to buffer
     */
    public UnsyncBufferedOutputStream(OutputStream out) {
        buf = (byte[])bufCache.get();
        this.out = out;
    }

    /** @inheritDoc */
    public void write(byte[] arg0) throws IOException {
        write(arg0, 0, arg0.length);
    }

    /** @inheritDoc */
    public void write(byte[] arg0, int arg1, int len) throws IOException {
        int newLen = pointer+len;
        if (newLen > size) {
            flushBuffer();		
            if (len > size) {
                out.write(arg0, arg1,len);
                return;
            }
            newLen = len;
        }
        System.arraycopy(arg0, arg1, buf, pointer, len);
        pointer = newLen;
    }

    private final void flushBuffer() throws IOException {
        if (pointer > 0) {
            out.write(buf, 0, pointer);
        }
        pointer=0;

    }

    /** @inheritDoc */
    public void write(int arg0) throws IOException {		
        if (pointer >= size) {
            flushBuffer();
        }
        buf[pointer++] = (byte)arg0;

    }

    /** @inheritDoc */	
    public void flush() throws IOException {
        flushBuffer();
        out.flush();
    }

    /** @inheritDoc */
    public void close() throws IOException {
        flush();				
    }

}