gnu.java.security.provider

Class DSASignature


public class DSASignature
extends SignatureSpi

Field Summary

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

DSASignature()
The basic constructor.

Method Summary

Object
clone()
This method may be called to create a new copy of the Object.
Object
engineGetParameter(String param)
void
engineInitSign(PrivateKey privateKey)
void
engineInitSign(PrivateKey privateKey, SecureRandom random)
void
engineInitVerify(PublicKey publicKey)
void
engineSetParameter(String param, Object value)
void
engineSetParameter(AlgorithmParameterSpec params)
byte[]
engineSign()
int
engineSign(byte[] outbuf, int offset, int len)
void
engineUpdate(byte b)
void
engineUpdate(byte[] b, int off, int len)
boolean
engineVerify(byte[] sigBytes)

Methods inherited from class java.security.SignatureSpi

clone, engineGetParameter, engineGetParameters, engineInitSign, engineInitSign, engineInitVerify, engineSetParameter, engineSetParameter, engineSign, engineSign, engineUpdate, engineUpdate, engineVerify, engineVerify

Methods inherited from class java.lang.Object

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

Constructor Details

DSASignature

public DSASignature()
            throws NoSuchAlgorithmException
The basic constructor. Object is special, because it has no superclass, so there is no call to super().

Method Details

clone

public Object clone()
            throws CloneNotSupportedException
This method may be called to create a new copy of the Object. The typical behavior is as follows:
  • o == o.clone() is false
  • o.getClass() == o.clone().getClass() is true
  • o.equals(o) is true

However, these are not strict requirements, and may be violated if necessary. Of the three requirements, the last is the most commonly violated, particularly if the subclass does not override Object.equals(Object).

If the Object you call clone() on does not implement Cloneable (which is a placeholder interface), then a CloneNotSupportedException is thrown. Notice that Object does not implement Cloneable; this method exists as a convenience for subclasses that do.

Object's implementation of clone allocates space for the new Object using the correct class, without calling any constructors, and then fills in all of the new field values with the old field values. Thus, it is a shallow copy. However, subclasses are permitted to make a deep copy.

All array types implement Cloneable, and override this method as follows (it should never fail):

 public Object clone()
 {
   try
     {
       super.clone();
     }
   catch (CloneNotSupportedException e)
     {
       throw new InternalError(e.getMessage());
     }
 }
 
Overrides:
clone in interface SignatureSpi
Returns:
a copy of the Object
Throws:
CloneNotSupportedException - If this Object does not implement Cloneable
See Also:
Cloneable

engineGetParameter

public Object engineGetParameter(String param)
            throws InvalidParameterException
Overrides:
engineGetParameter in interface SignatureSpi

engineInitSign

public void engineInitSign(PrivateKey privateKey)
            throws InvalidKeyException
Overrides:
engineInitSign in interface SignatureSpi

engineInitSign

public void engineInitSign(PrivateKey privateKey,
                           SecureRandom random)
            throws InvalidKeyException
Overrides:
engineInitSign in interface SignatureSpi

engineInitVerify

public void engineInitVerify(PublicKey publicKey)
            throws InvalidKeyException
Overrides:
engineInitVerify in interface SignatureSpi

engineSetParameter

public void engineSetParameter(String param,
                               Object value)
            throws InvalidParameterException
Overrides:
engineSetParameter in interface SignatureSpi

engineSetParameter

public void engineSetParameter(AlgorithmParameterSpec params)
            throws InvalidAlgorithmParameterException
Overrides:
engineSetParameter in interface SignatureSpi

engineSign

public byte[] engineSign()
            throws SignatureException
Overrides:
engineSign in interface SignatureSpi

engineSign

public int engineSign(byte[] outbuf,
                      int offset,
                      int len)
            throws SignatureException
Overrides:
engineSign in interface SignatureSpi

engineUpdate

public void engineUpdate(byte b)
            throws SignatureException
Overrides:
engineUpdate in interface SignatureSpi

engineUpdate

public void engineUpdate(byte[] b,
                         int off,
                         int len)
            throws SignatureException
Overrides:
engineUpdate in interface SignatureSpi

engineVerify

public boolean engineVerify(byte[] sigBytes)
            throws SignatureException
Overrides:
engineVerify in interface SignatureSpi

DSASignature.java -- Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc. This file is 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, 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; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, 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.