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.jcajce.provider.util;

import java.io.IOException;
import java.security.PrivateKey;
import java.security.PublicKey;

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

public interface AsymmetricKeyInfoConverter
{
    PrivateKey generatePrivate(PrivateKeyInfo keyInfo)
        throws IOException;

    PublicKey generatePublic(SubjectPublicKeyInfo keyInfo)
        throws IOException;
}