org.spongycastle.crypto

Interface Signer

All Known Subinterfaces:

SignerWithRecovery

All Known Implementing Classes:

DigestingMessageSigner, DigestingStateAwareMessageSigner, DSADigestSigner, GenericSigner, ISO9796d2PSSSigner, ISO9796d2Signer, PSSSigner, RSADigestSigner, X931Signer

public interface Signer

Generic signer interface for hash based and message recovery signers.

Method Summary

Modifier and Type	Method and Description
byte[]	generateSignature() generate a signature for the message we've been loaded with using the key we were initialised with.
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) return true if the internal state represents the signature described in the passed in array.

Method Detail

init

void init(boolean forSigning,
          CipherParameters param)

Initialise the signer for signing or verification.

Parameters:

forSigning - true if for signing, false otherwise

param - necessary parameters.

update

void update(byte b)

update the internal digest with the byte b

update

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

update the internal digest with the byte array in

generateSignature

byte[] generateSignature()
                  throws CryptoException,
                         DataLengthException

generate a signature for the message we've been loaded with using the key we were initialised with.

Throws:

CryptoException

DataLengthException

verifySignature

boolean verifySignature(byte[] signature)

return true if the internal state represents the signature described in the passed in array.

reset

void reset()

reset the internal state