org.bouncycastle.tsp.ers
Class BinaryTreeRootCalculator

java.lang.Object
  org.bouncycastle.tsp.ers.BinaryTreeRootCalculator

All Implemented Interfaces:

ERSRootNodeCalculator

public class BinaryTreeRootCalculator

extends java.lang.Object

implements ERSRootNodeCalculator

Calculator based on the use of a left weighted binary Merkle tree created on top of the partial hash tree objects provided.

Constructor Summary

BinaryTreeRootCalculator()

Method Summary

org.bouncycastle.asn1.tsp.PartialHashtree[]	computePathToRoot(DigestCalculator digCalc, org.bouncycastle.asn1.tsp.PartialHashtree node, int index) Calculate a path from the leaf node to the root of the last computed Merkle tree.
byte[]	computeRootHash(DigestCalculator digCalc, org.bouncycastle.asn1.tsp.PartialHashtree[] nodes) Calculate the root hash of the Merkle tree from the partial hash-tree nodes.
byte[]	recoverRootHash(DigestCalculator digCalc, org.bouncycastle.asn1.tsp.PartialHashtree[] nodes) Recover the root hash from a path made up of PartialHashtrees.

Methods inherited from class java.lang.Object

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

Constructor Detail

BinaryTreeRootCalculator

public BinaryTreeRootCalculator()

Method Detail

computeRootHash

public byte[] computeRootHash(DigestCalculator digCalc,
                              org.bouncycastle.asn1.tsp.PartialHashtree[] nodes)

Description copied from interface: ERSRootNodeCalculator

Calculate the root hash of the Merkle tree from the partial hash-tree nodes.

Specified by:

computeRootHash in interface ERSRootNodeCalculator

Parameters:

digCalc - the digest calculator to use.

nodes - the partial hash-trees forming the basis of the Merkle tree.

Returns:

the root hash of the Merkle tree.

computePathToRoot

public org.bouncycastle.asn1.tsp.PartialHashtree[] computePathToRoot(DigestCalculator digCalc,
                                                                     org.bouncycastle.asn1.tsp.PartialHashtree node,
                                                                     int index)

Description copied from interface: ERSRootNodeCalculator

Calculate a path from the leaf node to the root of the last computed Merkle tree.

Specified by:

computePathToRoot in interface ERSRootNodeCalculator

Parameters:

digCalc - the digest calculator to use.

node - the leaf node at the start of the path.

index - the index of the node in the original list of partial hash trees.

Returns:

recoverRootHash

public byte[] recoverRootHash(DigestCalculator digCalc,
                              org.bouncycastle.asn1.tsp.PartialHashtree[] nodes)

Description copied from interface: ERSRootNodeCalculator

Recover the root hash from a path made up of PartialHashtrees.

Specified by:

recoverRootHash in interface ERSRootNodeCalculator

Parameters:

digCalc - the digest calculator to use.

nodes - the partial hash-trees forming a path from a leaf to the root of the Merkle tree.

Returns:

the root hash of the Merkle tree.