org.spongycastle.pqc.crypto.gmss

Class GMSSStateAwareSigner

java.lang.Object

org.spongycastle.pqc.crypto.gmss.GMSSStateAwareSigner

All Implemented Interfaces:

MessageSigner, StateAwareMessageSigner

public class GMSSStateAwareSigner
extends java.lang.Object
implements StateAwareMessageSigner

This class implements the GMSS signature scheme, but allows multiple signatures to be generated.

Note: getUpdatedPrivateKey() needs to be called to fetch the current value of the usable private key.

Constructor Summary

Constructors

Constructor and Description
GMSSStateAwareSigner(Digest digest)

Method Summary

Modifier and Type	Method and Description
byte[]	generateSignature(byte[] message) sign the passed in message (usually the output of a hash function).
AsymmetricKeyParameter	getUpdatedPrivateKey() Return the current version of the private key with the updated state.
void	init(boolean forSigning, CipherParameters param) initialise the signer for signature generation or signature verification.
boolean	verifySignature(byte[] message, byte[] signature) verify the message message against the signature value.

Methods inherited from class java.lang.Object

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

Constructor Detail

GMSSStateAwareSigner

public GMSSStateAwareSigner(Digest digest)

Method Detail

init

public void init(boolean forSigning,
                 CipherParameters param)

Description copied from interface: MessageSigner

initialise the signer for signature generation or signature verification.

Specified by:

init in interface MessageSigner

Parameters:

forSigning - true if we are generating a signature, false otherwise.

param - key parameters for signature generation.

generateSignature

public byte[] generateSignature(byte[] message)

Description copied from interface: MessageSigner

sign the passed in message (usually the output of a hash function).

Specified by:

generateSignature in interface MessageSigner

Parameters:

message - the message to be signed.

Returns:

the signature of the message

verifySignature

public boolean verifySignature(byte[] message,
                               byte[] signature)

Description copied from interface: MessageSigner

verify the message message against the signature value.

Specified by:

verifySignature in interface MessageSigner

Parameters:

message - the message that was supposed to have been signed.

signature - the signature of the message

getUpdatedPrivateKey

public AsymmetricKeyParameter getUpdatedPrivateKey()

Description copied from interface: StateAwareMessageSigner

Return the current version of the private key with the updated state.

Note: calling this method will effectively disable the Signer from being used for further signature generation without another call to init().

Specified by:

getUpdatedPrivateKey in interface StateAwareMessageSigner

Returns:

an updated private key object, which can be used for later signature generation.