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package org.bouncycastle.pqc.math.ntru.polynomial;
public interface Polynomial
{
/**
* Multiplies the polynomial by an <code>IntegerPolynomial</code>,
* taking the indices mod <code>N</code>.
*
* @param poly2 a polynomial
* @return the product of the two polynomials
*/
IntegerPolynomial mult(IntegerPolynomial poly2);
/**
* Multiplies the polynomial by an <code>IntegerPolynomial</code>,
* taking the coefficient values mod <code>modulus</code> and the indices mod <code>N</code>.
*
* @param poly2 a polynomial
* @param modulus a modulus to apply
* @return the product of the two polynomials
*/
IntegerPolynomial mult(IntegerPolynomial poly2, int modulus);
/**
* Returns a polynomial that is equal to this polynomial (in the sense that {@link #mult(IntegerPolynomial, int)}
* returns equal <code>IntegerPolynomial</code>s). The new polynomial is guaranteed to be independent of the original.
*
* @return a new <code>IntegerPolynomial</code>.
*/
IntegerPolynomial toIntegerPolynomial();
/**
* Multiplies the polynomial by a <code>BigIntPolynomial</code>, taking the indices mod N. Does not
* change this polynomial but returns the result as a new polynomial.<br>
* Both polynomials must have the same number of coefficients.
*
* @param poly2 the polynomial to multiply by
* @return a new polynomial
*/
BigIntPolynomial mult(BigIntPolynomial poly2);
}
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