org.spongycastle.pqc.math.ntru.polynomial

Class BigIntPolynomial

java.lang.Object

org.spongycastle.pqc.math.ntru.polynomial.BigIntPolynomial

public class BigIntPolynomial
extends java.lang.Object

A polynomial with BigInteger coefficients.
Some methods (like add) change the polynomial, others (like mult) do not but return the result as a new polynomial.

Constructor Summary

Constructors

Constructor and Description
BigIntPolynomial(IntegerPolynomial p) Constructs a BigIntPolynomial from a IntegerPolynomial.

Method Summary

Modifier and Type	Method and Description
void	add(BigIntPolynomial b) Adds another polynomial which can have a different number of coefficients.
java.lang.Object	clone() Makes a copy of the polynomial that is independent of the original.
BigDecimalPolynomial	div(java.math.BigDecimal divisor, int decimalPlaces) Divides each coefficient by a BigDecimal and rounds the result to decimalPlaces places.
void	div(java.math.BigInteger divisor) Divides each coefficient by a BigInteger and rounds the result to the nearest whole number. Does not return a new polynomial but modifies this polynomial.
boolean	equals(java.lang.Object obj)
java.math.BigInteger[]	getCoeffs()
int	getMaxCoeffLength() Returns the base10 length of the largest coefficient.
int	hashCode()
void	mod(java.math.BigInteger modulus) Takes each coefficient modulo a number.
void	mult(java.math.BigInteger factor) Multiplies each coefficient by a BigInteger.
BigIntPolynomial	mult(BigIntPolynomial poly2) Multiplies the polynomial by another, taking the indices mod N.
void	sub(BigIntPolynomial b) Subtracts another polynomial which can have a different number of coefficients.

Methods inherited from class java.lang.Object

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

Constructor Detail

BigIntPolynomial

public BigIntPolynomial(IntegerPolynomial p)

Constructs a BigIntPolynomial from a IntegerPolynomial. The two polynomials are independent of each other.

Parameters:

p - the original polynomial

Method Detail

mult

public BigIntPolynomial mult(BigIntPolynomial poly2)

Multiplies the polynomial by another, 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.

Parameters:

poly2 - the polynomial to multiply by

Returns:

a new polynomial

add

public void add(BigIntPolynomial b)

Adds another polynomial which can have a different number of coefficients.

Parameters:

b - another polynomial

sub

public void sub(BigIntPolynomial b)

Subtracts another polynomial which can have a different number of coefficients.

Parameters:

b - another polynomial

mult

public void mult(java.math.BigInteger factor)

Multiplies each coefficient by a BigInteger. Does not return a new polynomial but modifies this polynomial.

Parameters:

factor -

div

public void div(java.math.BigInteger divisor)

Divides each coefficient by a BigInteger and rounds the result to the nearest whole number.
Does not return a new polynomial but modifies this polynomial.

Parameters:

divisor - the number to divide by

div

public BigDecimalPolynomial div(java.math.BigDecimal divisor,
                                int decimalPlaces)

Divides each coefficient by a BigDecimal and rounds the result to decimalPlaces places.

Parameters:

divisor - the number to divide by

decimalPlaces - the number of fractional digits to round the result to

Returns:

a new BigDecimalPolynomial

getMaxCoeffLength

public int getMaxCoeffLength()

Returns the base10 length of the largest coefficient.

Returns:

length of the longest coefficient

mod

public void mod(java.math.BigInteger modulus)

Takes each coefficient modulo a number.

Parameters:

modulus -

clone

public java.lang.Object clone()

Makes a copy of the polynomial that is independent of the original.

Overrides:

clone in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

getCoeffs

public java.math.BigInteger[] getCoeffs()