+++ /dev/null
-/* KeyFactory.java --- Key Factory Class
- Copyright (C) 1999 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., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 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. */
-
-package java.security;
-import java.security.spec.KeySpec;
-import java.security.spec.InvalidKeySpecException;
-
-/**
- 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
- @author Mark Benvenuto
- */
-public class KeyFactory
-{
- private KeyFactorySpi keyFacSpi;
- private Provider provider;
- private String algorithm;
-
- /**
- Constructs a new keyFactory with the specified parameters.
-
- @param keyFacSpi Key Factory SPI to use
- @param provider the provider of the Key Factory SPI
- @param algorithm the name of the key algorithm for this key factory
- */
- protected KeyFactory(KeyFactorySpi keyFacSpi, Provider provider,
- String algorithm)
- {
- this.keyFacSpi = keyFacSpi;
- this.provider = provider;
- this.algorithm = algorithm;
- }
-
- /**
- Gets an instance of the KeyFactory class representing
- the specified key factory. If the algorithm is not
- found then, it throws NoSuchAlgorithmException.
-
- @param algorithm the name of algorithm to choose
- @return a KeyFactory repesenting the desired algorithm
-
- @throws NoSuchAlgorithmException if the algorithm is not implemented by providers
- */
- public static KeyFactory getInstance(String algorithm)
- throws NoSuchAlgorithmException
- {
- Provider[] p = Security.getProviders();
-
- for (int i = 0; i < p.length; i++)
- {
- String classname = p[i].getProperty("KeyFactory." + algorithm);
- if (classname != null)
- return getInstance(classname, algorithm, p[i]);
- }
-
- throw new NoSuchAlgorithmException(algorithm);
- }
-
- /**
- Gets an instance of the KeyFactory class representing
- the specified key factory from the specified provider.
- If the algorithm is not found then, it throws
- NoSuchAlgorithmException. If the provider is not found, then
- it throws NoSuchProviderException.
-
- @param algorithm the name of algorithm to choose
- @param provider the name of the provider to find the algorithm in
- @return a KeyFactory repesenting the desired algorithm
-
- @throws NoSuchAlgorithmException if the algorithm is not implemented by the provider
- @throws NoSuchProviderException if the provider is not found
- */
- public static KeyFactory getInstance(String algorithm, String provider)
- throws NoSuchAlgorithmException, NoSuchProviderException
- {
- Provider p = Security.getProvider(provider);
- if (p == null)
- throw new NoSuchProviderException();
-
- return getInstance(p.getProperty("KeyFactory." + algorithm),
- algorithm, p);
- }
-
- private static KeyFactory getInstance(String classname,
- String algorithm,
- Provider provider)
- throws NoSuchAlgorithmException
- {
-
- try
- {
- return new KeyFactory((KeyFactorySpi) Class.forName(classname).
- newInstance(), provider, algorithm);
- }
- catch (ClassNotFoundException cnfe)
- {
- throw new NoSuchAlgorithmException("Class not found");
- }
- catch (InstantiationException ie)
- {
- throw new NoSuchAlgorithmException("Class instantiation failed");
- }
- catch (IllegalAccessException iae)
- {
- throw new NoSuchAlgorithmException("Illegal Access");
- }
- }
-
- /**
- Gets the provider that the class is from.
-
- @return the provider of this class
- */
- public final Provider getProvider()
- {
- return provider;
- }
-
- /**
- Returns the name of the algorithm used
-
- @return A string with the name of the algorithm
- */
- public final String getAlgorithm()
- {
- return algorithm;
- }
-
- /**
- Generates a public key from the provided key specification.
-
- @param keySpec key specification
-
- @return the public key
-
- @throws InvalidKeySpecException invalid key specification for
- this key factory to produce a public key
- */
- public final PublicKey generatePublic(KeySpec keySpec) throws
- InvalidKeySpecException
- {
- return keyFacSpi.engineGeneratePublic(keySpec);
- }
-
- /**
- Generates a private key from the provided key specification.
-
- @param keySpec key specification
-
- @return the private key
-
- @throws InvalidKeySpecException invalid key specification for
- this key factory to produce a private key
- */
- public final PrivateKey generatePrivate(KeySpec keySpec) throws
- InvalidKeySpecException
- {
- return keyFacSpi.engineGeneratePrivate(keySpec);
- }
-
- /**
- Returns a key specification for the given key. keySpec
- identifies the specification class to return the key
- material in.
-
- @param key the key
- @param keySpec the specification class to return the
- key material in.
-
- @return 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.
- */
- public final KeySpec getKeySpec(Key key, Class keySpec)
- throws InvalidKeySpecException
- {
- return keyFacSpi.engineGetKeySpec(key, keySpec);
- }
-
- /**
- Translates the key from an unknown or untrusted provider
- into a key for this key factory.
-
- @param the key from an unknown or untrusted provider
-
- @return the translated key
-
- @throws InvalidKeySpecException if the key cannot be
- processed by this key factory
- */
- public final Key translateKey(Key key) throws InvalidKeyException
- {
- return keyFacSpi.engineTranslateKey(key);
- }
-}
projects / msp430-gcc.git / blobdiff