base64.java

一个免费的CA,基于EJB平台的,老师叫我们测试,现把之共享出来让大家参考

/*************************************************************************
 *                                                                       *
 *  EJBCA: The OpenSource Certificate Authority                          *
 *                                                                       *
 *  This software is free software; you can redistribute it and/or       *
 *  modify it under the terms of the GNU Lesser General Public           *
 *  License as published by the Free Software Foundation; either         *
 *  version 2.1 of the License, or any later version.                    *
 *                                                                       *
 *  See terms of license at gnu.org.                                     *
 *                                                                       *
 *************************************************************************/
 
package org.ejbca.util;

import java.io.ByteArrayOutputStream;


/**
 * This class implements a BASE64 Character encoder/decoder as specified in RFC1521. 
 * It extends the bouncycastle implementation and adds the functionality to split lines 
 * with a '\n' after every 64 bytes.
 *
 * @version $Id: Base64.java,v 1.1 2006/01/17 20:32:19 anatom Exp $
 */
public class Base64 {

    /**
     * encode the input data producong a base 64 encoded byte array with the output lines be split by '\n' (64 byte rows).
     *
     * @param data data to be encoded
     * @return a byte array containing the base 64 encoded data.
     */
    public static byte[] encode(byte[] data) {
        return encode(data, true);
    }

	/**
     * encode the input data producong a base 64 encoded byte array.
     *
     * @param data the data to be encoded
     * @param splitlines whether the output lines will be split by '\n' (64 byte rows) or not.
     * @return a byte array containing the base 64 encoded data.
     */
    public static byte[] encode(byte[] data, boolean splitlines) {
		byte[] bytes = org.bouncycastle.util.encoders.Base64.encode(data);
        if (!splitlines) {
            return bytes;
        }

        // make sure we get limited lines...
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        for (int i = 0; i < bytes.length; i += 64) {
            if ((i + 64) < bytes.length) {
                os.write(bytes, i, 64);
                os.write('\n');
            } else {
                os.write(bytes, i, bytes.length - i);
            }
        }
        return os.toByteArray();
    }
    
    public static byte[] decode(byte[] bytes) {
        return org.bouncycastle.util.encoders.Base64.decode(bytes);
    }

}