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gnu.java.security.jce.sig

Class KeyPairGeneratorAdapter

Known Direct Subclasses:
DHKeyPairGeneratorSpi, DSSKeyPairGeneratorSpi, RSAKeyPairGeneratorSpi
public abstract class KeyPairGeneratorAdapter
extends KeyPairGenerator
The implementation of a generic KeyPairGenerator adapter class to wrap GNU keypair generator instances.

This class defines the Service Provider Interface (SPI) for the KeyPairGenerator class, which is used to generate pairs of public and private keys.

All the abstract methods in the KeyPairGeneratorSpi class are implemented by this class and all its sub-classes.

In case the client does not explicitly initialize the KeyPairGenerator (via a call to an initialize() method), the GNU provider supplies (and document) default values to be used. For example, the GNU provider uses a default modulus size (keysize) of 1024 bits for the DSS (Digital Signature Standard) a.k.a DSA.

Field Summary

protected IKeyPairGenerator
adaptee
Our underlying keypair instance.

Constructor Summary

KeyPairGeneratorAdapter(String kpgName)
Trivial protected constructor.

Method Summary

KeyPair
generateKeyPair()
Generates a KeyPair according the rules for the algorithm.
abstract void
initialize(int keysize, SecureRandom random)
Initialize the KeyPairGeneratorSpi with the specified key size and source of randomness
abstract void
initialize(AlgorithmParameterSpec params, SecureRandom random)
Initialize the KeyPairGeneratorSpi with the specified AlgorithmParameterSpec and source of randomness This is a concrete method.

Methods inherited from class java.security.KeyPairGenerator

genKeyPair, generateKeyPair, getAlgorithm, getInstance, getInstance, getInstance, getProvider, initialize, initialize, initialize, initialize

Methods inherited from class java.security.KeyPairGeneratorSpi

clone, generateKeyPair, initialize, initialize

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

adaptee

protected IKeyPairGenerator adaptee
Our underlying keypair instance.

Constructor Details

KeyPairGeneratorAdapter

protected KeyPairGeneratorAdapter(String kpgName)
Trivial protected constructor.
Parameters:
kpgName - the canonical name of the keypair generator algorithm.

Method Details

generateKeyPair

public KeyPair generateKeyPair()
Generates a KeyPair according the rules for the algorithm. Unless intialized, algorithm defaults will be used. It creates a unique key pair each time.
Overrides:
generateKeyPair in interface KeyPairGenerator
Returns:
a key pair

initialize

public abstract void initialize(int keysize,
                                SecureRandom random)
Initialize the KeyPairGeneratorSpi with the specified key size and source of randomness
Overrides:
initialize in interface KeyPairGenerator
Parameters:
keysize - size of the key to generate
random - A SecureRandom source of randomness

initialize

public abstract void initialize(AlgorithmParameterSpec params,
                                SecureRandom random)
            throws InvalidAlgorithmParameterException
Initialize the KeyPairGeneratorSpi with the specified AlgorithmParameterSpec and source of randomness This is a concrete method. It may be overridden by the provider and if the AlgorithmParameterSpec class is invalid throw InvalidAlgorithmParameterException. By default this method just throws UnsupportedOperationException.
Overrides:
initialize in interface KeyPairGenerator
Parameters:
params - A AlgorithmParameterSpec to intialize with
random - A SecureRandom source of randomness
Throws:
InvalidAlgorithmParameterException -
KeyPairGeneratorAdapter.java -- Copyright 2001, 2002, 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.

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