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.util;

import java.util.Collection;

public interface Store
{
    Collection getMatches(Selector selector)
        throws StoreException;
}