Package org.bouncycastle.pqc.legacy.crypto.gmss

Class GMSSRootSig

java.lang.Object
org.bouncycastle.pqc.legacy.crypto.gmss.GMSSRootSig
public class GMSSRootSig extends Object
This class implements the distributed signature generation of the Winternitz one-time signature scheme (OTSS), described in C.Dods, N.P. Smart, and M. Stam, "Hash Based Digital Signature Schemes", LNCS 3796, pages 96–115, 2005. The class is used by the GMSS classes.

  • Constructor Summary

    Constructors
    Constructor
    Description
    GMSSRootSig(Digest digest, byte[][] statByte, int[] statInt)
    This constructor regenerates a prior GMSSRootSig object used by the GMSSPrivateKeyASN.1 class
    GMSSRootSig(Digest digest, int w, int height)
    The constructor generates the PRNG and initializes some variables

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    getLog(int intValue)
    This method returns the least integer that is greater or equal to the logarithm to the base 2 of an integer intValue.
    byte[]
    getSig()
     
    byte[][]
    getStatByte()
    This method returns the status byte array
    int[]
    getStatInt()
    This method returns the status int array
    byte[]
    getStatLong()
    Converts the long parameters into byte arrays to store it in statByte-Array
    void
    initSign(byte[] seed0, byte[] message)
    This method initializes the distributed sigature calculation.
    String
    toString()
    returns a string representation of the instance
    boolean
    updateSign()
    This Method performs steps steps of distributed signature calculaion

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • GMSSRootSig

      public GMSSRootSig(Digest digest, byte[][] statByte, int[] statInt)
      This constructor regenerates a prior GMSSRootSig object used by the GMSSPrivateKeyASN.1 class
      Parameters:
      digest - an array of strings, containing the digest of the used hash function, the digest of the PRGN and the names of the corresponding providers
      statByte - status byte array
      statInt - status int array

    • GMSSRootSig

      public GMSSRootSig(Digest digest, int w, int height)
      The constructor generates the PRNG and initializes some variables
      Parameters:
      digest - an array of strings, containing the digest of the used hash function, the digest of the PRGN and the names of the corresponding providers
      w - the winternitz parameter
      height - the heigth of the tree

  • Method Details

    • initSign

      public void initSign(byte[] seed0, byte[] message)
      This method initializes the distributed sigature calculation. Variables are reseted and necessary steps are calculated
      Parameters:
      seed0 - the initial OTSseed
      message - the massage which will be signed

    • updateSign

      public boolean updateSign()
      This Method performs steps steps of distributed signature calculaion
      Returns:
      true if signature is generated completly, else false

    • getSig

      public byte[] getSig()
      Returns:
      The private OTS key

    • getLog

      public int getLog(int intValue)
      This method returns the least integer that is greater or equal to the logarithm to the base 2 of an integer intValue.
      Parameters:
      intValue - an integer
      Returns:
      The least integer greater or equal to the logarithm to the base 2 of intValue

    • getStatByte

      public byte[][] getStatByte()
      This method returns the status byte array
      Returns:
      statBytes

    • getStatInt

      public int[] getStatInt()
      This method returns the status int array
      Returns:
      statInt

    • getStatLong

      public byte[] getStatLong()
      Converts the long parameters into byte arrays to store it in statByte-Array

    • toString

      public String toString()
      returns a string representation of the instance
      Overrides:
      toString in class Object
      Returns:
      a string representation of the instance