gnu.java.security.sig
Class BaseSignature
- Cloneable, ISignature
A base abstract class to facilitate implementations of concrete Signatures.
abstract Object | clone()- Returns a clone copy of this instance.
|
protected abstract Object | generateSignature()
|
protected void | init()- Initialises the internal fields of this instance.
|
String | name()- Returns the canonical name of this signature scheme.
|
protected void | nextRandomBytes(byte[] buffer)- Fills the designated byte array with random data.
|
protected abstract void | setupForSigning(PrivateKey key)
|
protected abstract void | setupForVerification(PublicKey key)
|
void | setupSign(Map<K,V> attributes)- Initialises this instance for signature generation.
|
void | setupVerify(Map<K,V> attributes)- Initialises this instance for signature verification.
|
Object | sign()- Terminates a signature generation phase by digesting and processing the
context of the underlying message digest algorithm instance.
|
void | update(byte b)- Digests one byte of a message for signing or verification purposes.
|
void | update(byte[] b, int off, int len)- Digests a sequence of bytes from a message for signing or verification
purposes.
|
boolean | verify(Object sig)- Terminates a signature verification phase by digesting and processing the
context of the underlying message digest algorithm instance.
|
protected abstract boolean | verifySignature(Object signature)
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
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).
schemeName
protected String schemeName
The canonical name of this signature scheme.
BaseSignature
protected BaseSignature(String schemeName,
IMessageDigest md) Trivial constructor.
schemeName - the name of this signature scheme.md - the underlying instance of the message digest algorithm.
init
protected void init()
Initialises the internal fields of this instance.
name
public String name()
Returns the canonical name of this signature scheme.
- name in interface ISignature
- the canonical name of this instance.
nextRandomBytes
protected void nextRandomBytes(byte[] buffer)
Fills the designated byte array with random data.
buffer - the byte array to fill with random data.
sign
public Object sign()
Terminates a signature generation phase by digesting and processing the
context of the underlying message digest algorithm instance.
- sign in interface ISignature
- a
Object representing the native output of the signature
scheme implementation.
update
public void update(byte b)
Digests one byte of a message for signing or verification purposes.
- update in interface ISignature
b - the message byte to digest.
update
public void update(byte[] b,
int off,
int len) Digests a sequence of bytes from a message for signing or verification
purposes.
- update in interface ISignature
verify
public boolean verify(Object sig)
Terminates a signature verification phase by digesting and processing the
context of the underlying message digest algorithm instance.
- verify in interface ISignature
true iff the outpout of the verification phase
confirms that the designated signature object has been generated
using the corresponding public key of the recepient.
BaseSignature.java --
Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
This file is a part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version.