Package org.bouncycastle.pqc.legacy.math.ntru.polynomial

Class ProductFormPolynomial

java.lang.Object

org.bouncycastle.pqc.legacy.math.ntru.polynomial.ProductFormPolynomial

All Implemented Interfaces:

Polynomial

public class ProductFormPolynomial
extends Object
implements Polynomial

A polynomial of the form f1*f2+f3, where f1,f2,f3 are very sparsely populated ternary polynomials.

Constructor Summary

Constructors

Constructor	Description
ProductFormPolynomial(SparseTernaryPolynomial f1, SparseTernaryPolynomial f2, SparseTernaryPolynomial f3)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
static ProductFormPolynomial	fromBinary(byte[] data, int N, int df1, int df2, int df3Ones, int df3NegOnes)
static ProductFormPolynomial	fromBinary(InputStream is, int N, int df1, int df2, int df3Ones, int df3NegOnes)
static ProductFormPolynomial	generateRandom(int N, int df1, int df2, int df3Ones, int df3NegOnes, SecureRandom random)
int	hashCode()
BigIntPolynomial	mult(BigIntPolynomial b)	Multiplies the polynomial by a BigIntPolynomial, taking the indices mod N.
IntegerPolynomial	mult(IntegerPolynomial b)	Multiplies the polynomial by an IntegerPolynomial, taking the indices mod N.
IntegerPolynomial	mult(IntegerPolynomial poly2, int modulus)	Multiplies the polynomial by an IntegerPolynomial, taking the coefficient values mod modulus and the indices mod N.
byte[]	toBinary()
IntegerPolynomial	toIntegerPolynomial()	Returns a polynomial that is equal to this polynomial (in the sense that Polynomial.mult(IntegerPolynomial, int) returns equal IntegerPolynomials).

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ProductFormPolynomial

public ProductFormPolynomial(SparseTernaryPolynomial f1,
 SparseTernaryPolynomial f2,
 SparseTernaryPolynomial f3)

Method Details

generateRandom

public static ProductFormPolynomial generateRandom(int N,
 int df1,
 int df2,
 int df3Ones,
 int df3NegOnes,
 SecureRandom random)

fromBinary

public static ProductFormPolynomial fromBinary(byte[] data,
 int N,
 int df1,
 int df2,
 int df3Ones,
 int df3NegOnes)
                                        throws IOException

Throws:

IOException

fromBinary

public static ProductFormPolynomial fromBinary(InputStream is,
 int N,
 int df1,
 int df2,
 int df3Ones,
 int df3NegOnes)
                                        throws IOException

Throws:

IOException

toBinary

public byte[] toBinary()

mult

public IntegerPolynomial mult(IntegerPolynomial b)

Description copied from interface: Polynomial

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

Specified by:

mult in interface Polynomial

Parameters:

b - a polynomial

Returns:

the product of the two polynomials

mult

public BigIntPolynomial mult(BigIntPolynomial b)

Description copied from interface: Polynomial

Multiplies the polynomial by a BigIntPolynomial, taking the indices mod N. Does not change this polynomial but returns the result as a new polynomial.
Both polynomials must have the same number of coefficients.

Specified by:

mult in interface Polynomial

Parameters:

b - the polynomial to multiply by

Returns:

a new polynomial

toIntegerPolynomial

public IntegerPolynomial toIntegerPolynomial()

Description copied from interface: Polynomial

Returns a polynomial that is equal to this polynomial (in the sense that Polynomial.mult(IntegerPolynomial, int) returns equal IntegerPolynomials). The new polynomial is guaranteed to be independent of the original.

Specified by:

toIntegerPolynomial in interface Polynomial

Returns:

a new IntegerPolynomial.

mult

public IntegerPolynomial mult(IntegerPolynomial poly2,
 int modulus)

Description copied from interface: Polynomial

Multiplies the polynomial by an IntegerPolynomial, taking the coefficient values mod modulus and the indices mod N.

Specified by:

mult in interface Polynomial

Parameters:

poly2 - a polynomial

modulus - a modulus to apply

Returns:

the product of the two polynomials

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object