HFE
Class Multi2Power

java.lang.Object
  |
  +--HFE.Multi2Power

class Multi2Power

extends java.lang.Object

This class deals with multi-variable polynomials and a general modulus provied to the constructor. Basicly, this class calculates only powers of the form q^k where q is the number of elements in the field (here: 2) and k is a non-negative integer (e.g. 0, 1, 2) All calculations are done in GF(2) (Field2) Every entry is a polynomial of the form f_i(x1,x2,...) = g^i*(b_0 + b_1*x_1 + b_2*x_2 + ... + b_n*x_n) The reduction is done in the variable g.

Version:

0.15

Field Summary

private Poly2MultiLinear[][]

resArray Stores all the results.

Constructor Summary

(package private)

Multi2Power(Poly2Max modulus, Poly2MultiLinear[] start, int maxPower) Initializes the internal fields

Method Summary

Poly2MultiLinear[]	givePower(int which) Returns the polynomial vector for a given power which.
static void	main(java.lang.String[] args) Calls the testIt() method
static void	testIt() Tests the functionality of the class.

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

resArray

private Poly2MultiLinear[][] resArray

Stores all the results. Every power has its own polynomials. In resArray[0] are the powers of q^0, in resArray[1] the powers of q^1, .... resArray[i][0] is the polynomial for the output for 1, resArray[i][1] for gamma, resArray[i][2] for gamma^2,...

Constructor Detail

Multi2Power

Multi2Power(Poly2Max modulus,
            Poly2MultiLinear[] start,
            int maxPower)

Initializes the internal fields

Parameters:

modulus - polynomial over GF(2) for reduction the number of variables must be 3 for our purpose

start - multivariable polynomials over GF(2) for q^0.

maxpower - till which power shall we compute?

Method Detail

givePower

public Poly2MultiLinear[] givePower(int which)

Returns the polynomial vector for a given power which. Can only return values which have been computed by the constructor.

testIt

public static void testIt()

Tests the functionality of the class. Is called by the main method.

main

public static void main(java.lang.String[] args)

Calls the testIt() method