gnu.crypto.sig

Class BaseSignature

Implemented Interfaces:
Cloneable, ISignature
Known Direct Subclasses:
DSSSignature, RSAPKCS1V1_5Signature, RSAPSSSignature

public abstract class BaseSignature
extends java.lang.Object
implements ISignature

A base abstract class to facilitate implementations of concrete Signatures.

Version:
$Revision: 1.7 $

Field Summary

protected IMessageDigest
md
The underlying message digest instance for this signature scheme.
protected PrivateKey
privateKey
The private key to use when generating signatures (signing).
protected PublicKey
publicKey
The public key to use when verifying signatures.
protected String
schemeName
The canonical name of this signature scheme.

Fields inherited from interface gnu.crypto.sig.ISignature

SIGNER_KEY, SOURCE_OF_RANDOMNESS, VERIFIER_KEY

Constructor Summary

BaseSignature(String schemeName, IMessageDigest md)
Trivial constructor.

Method Summary

Object
clone()
protected Object
generateSignature()
protected void
init()
Initialises the internal fields of this instance.
String
name()
protected void
nextRandomBytes(byte[] buffer)
Fills the designated byte array with random data.
protected void
setupForSigning(PrivateKey key)
protected void
setupForVerification(PublicKey key)
void
setupSign(Map attributes)
void
setupVerify(Map attributes)
Object
sign()
void
update(byte b)
void
update(byte[] b, int off, int len)
boolean
verify(Object sig)
protected boolean
verifySignature(Object signature)

Field Details

md

protected IMessageDigest md
The underlying message digest instance for this signature scheme.


privateKey

protected PrivateKey privateKey
The private key to use when generating signatures (signing).


publicKey

protected PublicKey publicKey
The public key to use when verifying signatures.


schemeName

protected String schemeName
The canonical name of this signature scheme.

Constructor Details

BaseSignature

protected BaseSignature(String schemeName,
                        IMessageDigest md)
Trivial constructor.

Parameters:
schemeName - the name of this signature scheme.
md - the underlying instance of the message digest algorithm.

Method Details

clone

public Object clone()
Specified by:
clone in interface ISignature


generateSignature

protected Object generateSignature()
            throws IllegalStateException


init

protected void init()
Initialises the internal fields of this instance.


name

public String name()
Specified by:
name in interface ISignature


nextRandomBytes

protected void nextRandomBytes(byte[] buffer)
Fills the designated byte array with random data.

Parameters:
buffer - the byte array to fill with random data.


setupForSigning

protected void setupForSigning(PrivateKey key)
            throws IllegalArgumentException


setupForVerification

protected void setupForVerification(PublicKey key)
            throws IllegalArgumentException


setupSign

public void setupSign(Map attributes)
            throws IllegalArgumentException
Specified by:
setupSign in interface ISignature


setupVerify

public void setupVerify(Map attributes)
            throws IllegalArgumentException
Specified by:
setupVerify in interface ISignature


sign

public Object sign()
Specified by:
sign in interface ISignature


update

public void update(byte b)
Specified by:
update in interface ISignature


update

public void update(byte[] b,
                   int off,
                   int len)
Specified by:
update in interface ISignature


verify

public boolean verify(Object sig)
Specified by:
verify in interface ISignature


verifySignature

protected boolean verifySignature(Object signature)
            throws IllegalStateException


Copyright © 2001, 2002, 2003 Free Software Foundation, Inc. All Rights Reserved.