http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
package org.bouncycastle.x509.util;

import java.util.Collection;

public interface StreamParser
{
    Object read() throws StreamParsingException;

    Collection readAll() throws StreamParsingException;
}