org.xlattice
Class SigVerifier

java.lang.Object
  org.xlattice.SigVerifier

public abstract class SigVerifier
extends java.lang.Object

Given a PublicKey, instances of this class can verify digital signatures.

Author:

Jim Dixon

Constructor Summary

protected

SigVerifier()

Method Summary

abstract java.lang.String	getAlgorithm()
abstract void	init(PublicKey pubkey) Initialize the verifier for use with a particular PublicKey.
abstract SigVerifier	update(byte[] data) Add block of data to that being checked.
abstract SigVerifier	update(byte[] data, int offset, int len)
abstract boolean	verify(byte[] digSig) Check the digital signature passed against the data accumulated.
abstract boolean	verify(byte[] digSig, int offset, int len)

Methods inherited from class java.lang.Object

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

Constructor Detail

SigVerifier

protected SigVerifier()

Method Detail

getAlgorithm

public abstract java.lang.String getAlgorithm()

init

public abstract void init(PublicKey pubkey)
                   throws CryptoException

Initialize the verifier for use with a particular PublicKey.

Parameters:

pubkey - PublicKey against which digital signature is verified

Throws:

CryptoException

update

public abstract SigVerifier update(byte[] data)
                            throws CryptoException

Add block of data to that being checked.

Parameters:

data - byte array being added

Returns:

reference to this verifier as a convenience in chaining

Throws:

CryptoException

update

public abstract SigVerifier update(byte[] data,
                                   int offset,
                                   int len)
                            throws CryptoException

Throws:

CryptoException

verify

public abstract boolean verify(byte[] digSig)
                        throws CryptoException

Check the digital signature passed against the data accumulated.

Parameters:

digSig - signature being checked

Returns:

whether the check is successful

Throws:

CryptoException

verify

public abstract boolean verify(byte[] digSig,
                               int offset,
                               int len)
                        throws CryptoException

Throws:

CryptoException