de.flexiprovider.pqc.hbc.cmss
Class SPRNodeCalc

java.lang.Object
  |
  +--de.flexiprovider.pqc.hbc.cmss.SPRNodeCalc

All Implemented Interfaces:

NodeCalc

public class SPRNodeCalc

extends java.lang.Object

implements NodeCalc

This class provides an implementation of the NodeCalc interface, which calculates nodes in a way, that the use of SPR Hash Functions is secure.

Constructor Summary

SPRNodeCalc(MessageDigest md, byte[][][] masks, int otsMdSize)
Constructs a new SPRNodeCalc object, that uses the given MessageDigest and masks to calculate the nodes.

Method Summary

byte[]	computeParent(byte[] leftNode, byte[] rightNode, int height) Calculates the parent node of two children.
byte[]	getLeaf(byte[] vkey) Calculates the leaf of a tree from the verification key.

Methods inherited from class java.lang.Object

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

Constructor Detail

SPRNodeCalc

public SPRNodeCalc(MessageDigest md,
                   byte[][][] masks,
                   int otsMdSize)

Constructs a new SPRNodeCalc object, that uses the given MessageDigest and masks to calculate the nodes. The size of the MessageDigest, that the OTS uses, is necessary to calculate the leafs properly.

Parameters:

md -

masks -

otsMdSize -

Method Detail

computeParent

public byte[] computeParent(byte[] leftNode,
                            byte[] rightNode,
                            int height)

Description copied from interface: NodeCalc

Calculates the parent node of two children.

Specified by:

computeParent in interface NodeCalc

Following copied from interface: de.flexiprovider.pqc.hbc.cmss.NodeCalc

Parameters:

leftNode - the left child

rightNode - the right child

height - the height of the children

Returns:

the parent node

getLeaf

public byte[] getLeaf(byte[] vkey)

Description copied from interface: NodeCalc

Calculates the leaf of a tree from the verification key.

Specified by:

getLeaf in interface NodeCalc

Following copied from interface: de.flexiprovider.pqc.hbc.cmss.NodeCalc

Parameters:

vkey - the verification key to calculate the leaf from.

Returns:

the leaf