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.crypto.tls;

public interface TlsPSKIdentity
{
    void skipIdentityHint();

    void notifyIdentityHint(byte[] psk_identity_hint);

    byte[] getPSKIdentity();

    byte[] getPSK();
}