Package org.bouncycastle.tsp.ers

Interface ERSRootNodeCalculator

  • All Known Implementing Classes:
    BinaryTreeRootCalculator
    public interface ERSRootNodeCalculator
    Base interface for an implementation that calculates the root hash contained in the time-stamp from the Merkle tree based on the partial hash-tree nodes.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      org.bouncycastle.asn1.tsp.PartialHashtree[] computePathToRoot​(org.bouncycastle.operator.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​(org.bouncycastle.operator.DigestCalculator digCalc, org.bouncycastle.asn1.tsp.PartialHashtree[] nodes)
      Calculate the root hash of the Merkle tree from the partial hash-tree nodes.
      byte[] recoverRootHash​(org.bouncycastle.operator.DigestCalculator digCalc, org.bouncycastle.asn1.tsp.PartialHashtree[] nodes)
      Recover the root hash from a path made up of PartialHashtrees.

    • Method Detail

      • computeRootHash

        byte[] computeRootHash​(org.bouncycastle.operator.DigestCalculator digCalc,
                       org.bouncycastle.asn1.tsp.PartialHashtree[] nodes)
        Calculate the root hash of the Merkle tree from the partial hash-tree nodes.
        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

        org.bouncycastle.asn1.tsp.PartialHashtree[] computePathToRoot​(org.bouncycastle.operator.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.
        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

        byte[] recoverRootHash​(org.bouncycastle.operator.DigestCalculator digCalc,
                       org.bouncycastle.asn1.tsp.PartialHashtree[] nodes)
        Recover the root hash from a path made up of PartialHashtrees.
        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.