org.spongycastle.pqc.crypto.gmss.util

Class WinternitzOTSignature

java.lang.Object

org.spongycastle.pqc.crypto.gmss.util.WinternitzOTSignature

public class WinternitzOTSignature
extends java.lang.Object

This class implements key pair generation and 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 and Description
WinternitzOTSignature(byte[] seed0, Digest digest, int w) The constructor generates an OTS key pair, using seed0 and the PRNG

Method Summary

Modifier and Type	Method and 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[][]	getPrivateKey()
byte[]	getPublicKey()
byte[]	getSignature(byte[] message)

Methods inherited from class java.lang.Object

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

Constructor Detail

WinternitzOTSignature

public WinternitzOTSignature(byte[] seed0,
                             Digest digest,
                             int w)

The constructor generates an OTS key pair, using seed0 and the PRNG

Parameters:

seed0 - the seed for the PRGN

digest - an array of strings, containing the name of the used hash function, the name of the PRGN and the names of the corresponding providers

w - the Winternitz parameter

Method Detail

getPrivateKey

public byte[][] getPrivateKey()

Returns:

The private OTS key

getPublicKey

public byte[] getPublicKey()

Returns:

The public OTS key

getSignature

public byte[] getSignature(byte[] message)

Returns:

The one-time signature of the message, generated with the private 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