de.flexiprovider.pqc.hbc.gmss
Class GMSSLeaf

java.lang.Object
  |
  +--de.flexiprovider.pqc.hbc.gmss.GMSSLeaf

public class GMSSLeaf

extends java.lang.Object

This class implements the distributed computation of the public key of the Winternitz one-time signature scheme (OTSS). The class is used by the GMSS classes for calculation of upcoming leafs.

Author:

Sebastian Blume, Michael Schneider

Field Summary

(package private) byte[]

privateKeyOTS the OTS privateKey parts

Constructor Summary

GMSSLeaf(java.lang.String[] name, byte[][] statByte, int[] statInt)
This constructor regenerates a prior GMSSLeaf object

GMSSLeaf(java.lang.String[] name, int w, int numLeafs)
The constructor precomputes some needed variables for ditributed leaf calculation

Method Summary

byte[]	getLeaf() Returns the leaf value.
byte[][]	getStatByte() Returns the status byte array used by the GMSSPrivateKeyASN.1 class
int[]	getStatInt() Returns the status int array used by the GMSSPrivateKeyASN.1 class
void	initLeafCalc(byte[] seed0) initialize the distributed leaf calculation reset i,j and compute OTSseed with seed0
java.lang.String	toString() Returns a String representation of the main part of this element
boolean	updateLeafCalc() Processes steps steps of distributed leaf calculation

Methods inherited from class java.lang.Object

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

Field Detail

privateKeyOTS

byte[] privateKeyOTS

the OTS privateKey parts

Constructor Detail

GMSSLeaf

public GMSSLeaf(java.lang.String[] name,
                byte[][] statByte,
                int[] statInt)

This constructor regenerates a prior GMSSLeaf object

Parameters:

name - an array of strings, containing the name of the used hash function and PRNG and the name of the corresponding provider

statByte - status bytes

statInt - status ints

GMSSLeaf

public GMSSLeaf(java.lang.String[] name,
                int w,
                int numLeafs)

The constructor precomputes some needed variables for ditributed leaf calculation

Parameters:

name - an array of strings, containing the name of the used hash function and PRNG and the name of the corresponding provider

w - the winterniz parameter of that tree the leaf is computed for

numLeafs - the number of leafs of the tree from where the distributed computation is called

Method Detail

initLeafCalc

public void initLeafCalc(byte[] seed0)

initialize the distributed leaf calculation reset i,j and compute OTSseed with seed0

Parameters:

seed0 - the starting seed

updateLeafCalc

public boolean updateLeafCalc()

Processes steps steps of distributed leaf calculation

Returns:

true if leaf is completed, else false

getLeaf

public byte[] getLeaf()

Returns the leaf value.

Returns:

the leaf value

getStatByte

public byte[][] getStatByte()

Returns the status byte array used by the GMSSPrivateKeyASN.1 class

Returns:

The status bytes

getStatInt

public int[] getStatInt()

Returns the status int array used by the GMSSPrivateKeyASN.1 class

Returns:

The status ints

toString

public java.lang.String toString()

Returns a String representation of the main part of this element

Overrides:

toString in class java.lang.Object

Returns:

a String representation of the main part of this element