J2ME加密算法的代码!里面包括常用的算法

				package org.bouncycastle.asn1;								import java.io.IOException;								/**				 * A NULL object.				 */				public class DERNull				    extends ASN1Null				{				    public static final DERNull INSTANCE = new DERNull();								    byte[]  zeroBytes = new byte[0];								    public DERNull()				    {				    }								    void encode(				        DEROutputStream  out)				        throws IOException				    {				        out.writeEncoded(NULL, zeroBytes);				    }				}