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 1.7. 
package org.bouncycastle.asn1.pkcs;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public class KeyDerivationFunc
    extends AlgorithmIdentifier
{
    KeyDerivationFunc(
        ASN1Sequence  seq)
    {
        super(seq);
    }
    
    public KeyDerivationFunc(
        DERObjectIdentifier id,
        ASN1Encodable       params)
    {
        super(id, params);
    }
}