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java.security

Class KeyFactorySpi

Known Direct Subclasses:
DHKeyFactory, DSSKeyFactory, EncodedKeyFactory, RSAKeyFactory
public abstract class KeyFactorySpi
extends Object
KeyFactorySpi is the Service Provider Interface (SPI) for the KeyFactory class. This is the interface for providers to supply to implement a key factory for an algorithm. Key factories are used to convert keys (opaque cryptographic keys of type Key) into key specifications (transparent representations of the underlying key material). Key factories are bi-directional. They allow a key class to be converted into a key specification (key material) and back again. For example DSA public keys can be specified as DSAPublicKeySpec or X509EncodedKeySpec. The key factory translate these key specifications.
Since:
JDK 1.2

Constructor Summary

KeyFactorySpi()
Constucts a new KeyFactorySpi.

Method Summary

protected abstract PrivateKey
engineGeneratePrivate(KeySpec keySpec)
Generates a private key from the provided key specification.
protected abstract PublicKey
engineGeneratePublic(KeySpec keySpec)
Generates a public key from the provided key specification.
protected abstract Key
engineTranslateKey(Key key)
Translates the key from an unknown or untrusted provider into a key for this key factory.
protected abstract
extends KeySpec> T engineGetKeySpec(Key key, Class keySpec)
Returns a key specification for the given key. keySpec identifies the specification class to return the key material in.

Methods inherited from class java.lang.Object

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

Constructor Details

KeyFactorySpi

public KeyFactorySpi()
Constucts a new KeyFactorySpi.

Method Details

engineGeneratePrivate

protected abstract PrivateKey engineGeneratePrivate(KeySpec keySpec)
            throws InvalidKeySpecException
Generates a private key from the provided key specification.
Parameters:
keySpec - key specification
Returns:
the private key
Throws:
InvalidKeySpecException - invalid key specification for this key factory to produce a private key

engineGeneratePublic

protected abstract PublicKey engineGeneratePublic(KeySpec keySpec)
            throws InvalidKeySpecException
Generates a public key from the provided key specification.
Parameters:
keySpec - key specification
Returns:
the public key
Throws:
InvalidKeySpecException - invalid key specification for this key factory to produce a public key

engineTranslateKey

protected abstract Key engineTranslateKey(Key key)
            throws InvalidKeyException
Translates the key from an unknown or untrusted provider into a key for this key factory.
Parameters:
key - key from an unknown or untrusted provider
Returns:
the translated key
Throws:
InvalidKeyException - if the key cannot be processed by this key factory

extends KeySpec> T engineGetKeySpec

protected abstract extends KeySpec> T engineGetKeySpec(Key key,
                                                          Class keySpec)
            throws InvalidKeySpecException
Returns a key specification for the given key. keySpec identifies the specification class to return the key material in.
Parameters:
key - the key
keySpec - the specification class to return the key material in.
Returns:
the key specification in an instance of the requested specification class
Throws:
InvalidKeySpecException - the requested key specification is inappropriate for this key or the key is unrecognized.
KeyFactorySpi.java --- Key Factory Service Provider Interface Copyright (C) 1999, 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.

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