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;

import javax.crypto.SecretKey;


Base interface for keys associated with various password based key derivation functions (PBKDF).

/**
 * Base interface for keys associated with various password based key derivation functions (PBKDF).
 */
public interface PBKDFKey
    extends SecretKey
{
}