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.math.ntru.polynomial;


A polynomial whose coefficients are all equal to -1, 0, or 1

/**
 * A polynomial whose coefficients are all equal to -1, 0, or 1
 */
public interface TernaryPolynomial
    extends Polynomial
{

    
Multiplies the polynomial by an IntegerPolynomial, taking the indices mod N

/**
     * Multiplies the polynomial by an <code>IntegerPolynomial</code>, taking the indices mod N
     */
    IntegerPolynomial mult(IntegerPolynomial poly2);

    int[] getOnes();

    int[] getNegOnes();

    
Returns the maximum number of coefficients the polynomial can have

/**
     * Returns the maximum number of coefficients the polynomial can have
     */
    int size();

    void clear();
}