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.pqc.crypto.ntru;

public class NTRUParameters
{
    public static final int TERNARY_POLYNOMIAL_TYPE_SIMPLE = 0;
    public static final int TERNARY_POLYNOMIAL_TYPE_PRODUCT = 1;
}