2362N/A * Copyright (c) 1997, 2004, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) 0N/A * for the <code>KeyFactory</code> class. 0N/A * All the abstract methods in this class must be implemented by each 0N/A * cryptographic service provider who wishes to supply the implementation 0N/A * of a key factory for a particular algorithm. 0N/A * <P> Key factories are used to convert <I>keys</I> (opaque 0N/A * cryptographic keys of type <code>Key</code>) into <I>key specifications</I> 0N/A * (transparent representations of the underlying key material), and vice 0N/A * <P> Key factories are bi-directional. That is, they allow you to build an 0N/A * opaque key object from a given key specification (key material), or to 0N/A * retrieve the underlying key material of a key object in a suitable format. 0N/A * <P> Multiple compatible key specifications may exist for the same key. 0N/A * For example, a DSA public key may be specified using 0N/A * <code>DSAPublicKeySpec</code> or 0N/A * <code>X509EncodedKeySpec</code>. A key factory can be used to translate 0N/A * between compatible key specifications. 0N/A * <P> A provider should document all the key specifications supported by its 0N/A * @see java.security.spec.KeySpec 0N/A * @see java.security.spec.DSAPublicKeySpec 0N/A * @see java.security.spec.X509EncodedKeySpec 0N/A * Generates a public key object from the provided key 0N/A * specification (key material). 0N/A * @param keySpec the specification (key material) of the public key. 0N/A * @return the public key. 0N/A * @exception InvalidKeySpecException if the given key specification 0N/A * is inappropriate for this key factory to produce a public key. 0N/A * Generates a private key object from the provided key 0N/A * specification (key material). 0N/A * @param keySpec the specification (key material) of the private key. 0N/A * @return the private key. 0N/A * @exception InvalidKeySpecException if the given key specification 0N/A * is inappropriate for this key factory to produce a private key. 0N/A * Returns a specification (key material) of the given key 0N/A * <code>keySpec</code> identifies the specification class in which 0N/A * the key material should be returned. It could, for example, be 0N/A * <code>DSAPublicKeySpec.class</code>, to indicate that the 0N/A * key material should be returned in an instance of the 0N/A * <code>DSAPublicKeySpec</code> class. 0N/A * @param key the key. 0N/A * @param keySpec the specification class in which 0N/A * the key material should be returned. 0N/A * @return the underlying key specification (key material) in an instance 0N/A * of the requested specification class. 0N/A * @exception InvalidKeySpecException if the requested key specification is 0N/A * inappropriate for the given key, or the given key cannot be dealt with 0N/A * (e.g., the given key has an unrecognized format). 0N/A * Translates a key object, whose provider may be unknown or 0N/A * potentially untrusted, into a corresponding key object of this key 0N/A * @param key the key whose provider is unknown or untrusted. 0N/A * @return the translated key. 0N/A * @exception InvalidKeyException if the given key cannot be processed 0N/A * by this key factory.