135 lines
4.5 KiB
Java
135 lines
4.5 KiB
Java
/* KeyFactorySpi.java --- Key Factory Service Provider Interface
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Copyright (C) 1999, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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/**
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* KeyFactorySpi is the Service Provider Interface (SPI) for the
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* KeyFactory class. This is the interface for providers to
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* supply to implement a key factory for an algorithm.
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*
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* Key factories are used to convert keys (opaque cryptographic
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* keys of type Key) into key specifications (transparent
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* representations of the underlying key material).
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*
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* Key factories are bi-directional. They allow a key class
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* to be converted into a key specification (key material) and
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* back again.
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*
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* For example DSA public keys can be specified as
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* DSAPublicKeySpec or X509EncodedKeySpec. The key factory
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* translate these key specifications.
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*
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* @since JDK 1.2
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* @author Mark Benvenuto
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*/
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public abstract class KeyFactorySpi
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{
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/**
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* Constucts a new KeyFactorySpi.
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*/
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public KeyFactorySpi()
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{
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}
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/**
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* Generates a public key from the provided key specification.
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*
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* @param keySpec key specification
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*
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* @return the public key
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*
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* @throws InvalidKeySpecException invalid key specification for
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* this key factory to produce a public key
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*/
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protected abstract PublicKey engineGeneratePublic(KeySpec keySpec)
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throws InvalidKeySpecException;
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/**
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* Generates a private key from the provided key specification.
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*
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* @param keySpec key specification
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*
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* @return the private key
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*
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* @throws InvalidKeySpecException invalid key specification for
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* this key factory to produce a private key
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*/
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protected abstract PrivateKey engineGeneratePrivate(KeySpec keySpec)
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throws InvalidKeySpecException;
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/**
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* Returns a key specification for the given key. keySpec
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* identifies the specification class to return the key
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* material in.
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*
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* @param key the key
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* @param keySpec the specification class to return the
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* key material in.
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*
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* @return the key specification in an instance of the requested
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* specification class
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*
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* @throws InvalidKeySpecException the requested key specification
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* is inappropriate for this key or the key is
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* unrecognized.
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*/
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protected abstract <T extends KeySpec> T engineGetKeySpec(Key key,
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Class<T> keySpec)
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throws InvalidKeySpecException;
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/**
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* Translates the key from an unknown or untrusted provider
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* into a key for this key factory.
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*
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* @param key key from an unknown or untrusted provider
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*
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* @return the translated key
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*
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* @throws InvalidKeyException if the key cannot be
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* processed by this key factory
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*/
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protected abstract Key engineTranslateKey(Key key)
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throws InvalidKeyException;
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}
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