org.spongycastle.pqc.crypto

Class DigestingMessageSigner

java.lang.Object

org.spongycastle.pqc.crypto.DigestingMessageSigner

All Implemented Interfaces:

Signer

Direct Known Subclasses:

DigestingStateAwareMessageSigner

public class DigestingMessageSigner
extends java.lang.Object
implements Signer

Implements the sign and verify functions for a Signature Scheme using a hash function to allow processing of large messages.

Constructor Summary

Constructors

Constructor and Description
DigestingMessageSigner(MessageSigner messSigner, Digest messDigest)

Method Summary

Modifier and Type	Method and Description
byte[]	generateSignature() This function signs the message that has been updated, making use of the private key.
void	init(boolean forSigning, CipherParameters param) Initialise the signer for signing or verification.
void	reset() reset the internal state
void	update(byte b) update the internal digest with the byte b
void	update(byte[] in, int off, int len) update the internal digest with the byte array in
boolean	verifySignature(byte[] signature) This function verifies the signature of the message that has been updated, with the aid of the public key.

Methods inherited from class java.lang.Object

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

Constructor Detail

DigestingMessageSigner

public DigestingMessageSigner(MessageSigner messSigner,
                              Digest messDigest)

Method Detail

init

public void init(boolean forSigning,
                 CipherParameters param)

Description copied from interface: Signer

Initialise the signer for signing or verification.

Specified by:

init in interface Signer

Parameters:

forSigning - true if for signing, false otherwise

param - necessary parameters.

generateSignature

public byte[] generateSignature()

This function signs the message that has been updated, making use of the private key.

Specified by:

generateSignature in interface Signer

Returns:

the signature of the message.

update

public void update(byte b)

Description copied from interface: Signer

update the internal digest with the byte b

Specified by:

update in interface Signer

update

public void update(byte[] in,
                   int off,
                   int len)

Description copied from interface: Signer

update the internal digest with the byte array in

Specified by:

update in interface Signer

reset

public void reset()

Description copied from interface: Signer

reset the internal state

Specified by:

reset in interface Signer

verifySignature

public boolean verifySignature(byte[] signature)

This function verifies the signature of the message that has been updated, with the aid of the public key.

Specified by:

verifySignature in interface Signer

Parameters:

signature - the signature of the message is given as a byte array.

Returns:

true if the signature has been verified, false otherwise.