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 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.x509;

import org.bouncycastle.util.Selector;

import java.util.Collection;

public abstract class X509StoreSpi
{
    public abstract void engineInit(X509StoreParameters parameters);

    public abstract Collection engineGetMatches(Selector selector);
}