/* * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.crypto.provider; import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactorySpi;import javax.crypto.spec.DESKeySpec;import java.security.InvalidKeyException;import java.security.spec.KeySpec;import java.security.spec.InvalidKeySpecException; /** * This class implements the DES key factory of the Sun provider. * * @author Jan Luehe * */ public final class DESKeyFactory extends SecretKeyFactorySpi {     /**     * Empty constructor     */    public DESKeyFactory() {    }     /**     * Generates a <code>SecretKey</code> object from the provided key     * specification (key material).     *     * @param keySpec the specification (key material) of the secret key     *     * @return the secret key     *     * @exception InvalidKeySpecException if the given key specification     * is inappropriate for this key factory to produce a public key.     */    protected SecretKey engineGenerateSecret(KeySpec keySpec)        throws InvalidKeySpecException {        DESKey desKey = null;         try {            if (!(keySpec instanceof DESKeySpec)) {                throw new InvalidKeySpecException                    ("Inappropriate key specification");            }            else {                DESKeySpec desKeySpec = (DESKeySpec)keySpec;                desKey = new DESKey(desKeySpec.getKey());            }        } catch (InvalidKeyException e) {        }        return desKey;    }     /**     * Returns a specification (key material) of the given key     * in the requested format.     *     * @param key the key     *     * @param keySpec the requested format in which the key material shall be     * returned     *     * @return the underlying key specification (key material) in the     * requested format     *     * @exception InvalidKeySpecException if the requested key specification is     * inappropriate for the given key, or the given key cannot be processed     * (e.g., the given key has an unrecognized algorithm or format).     */    protected KeySpec engineGetKeySpec(SecretKey key, Class keySpec)        throws InvalidKeySpecException {         try {             if ((key instanceof SecretKey)                && (key.getAlgorithm().equalsIgnoreCase("DES"))                && (key.getFormat().equalsIgnoreCase("RAW"))) {                 // Check if requested key spec is amongst the valid ones                if ((keySpec != null) &&                    DESKeySpec.class.isAssignableFrom(keySpec)) {                    return new DESKeySpec(key.getEncoded());                 } else {                    throw new InvalidKeySpecException                        ("Inappropriate key specification");                }             } else {                throw new InvalidKeySpecException                    ("Inappropriate key format/algorithm");            }         } catch (InvalidKeyException e) {            throw new InvalidKeySpecException("Secret key has wrong size");        }    }     /**     * Translates a <code>SecretKey</code> object, whose provider may be     * unknown or potentially untrusted, into a corresponding     * <code>SecretKey</code> object of this key factory.     *     * @param key the key whose provider is unknown or untrusted     *     * @return the translated key     *     * @exception InvalidKeyException if the given key cannot be processed by     * this key factory.     */    protected SecretKey engineTranslateKey(SecretKey key)        throws InvalidKeyException {         try {             if ((key != null) &&                (key.getAlgorithm().equalsIgnoreCase("DES")) &&                (key.getFormat().equalsIgnoreCase("RAW"))) {                 // Check if key originates from this factory                if (key instanceof com.sun.crypto.provider.DESKey) {                    return key;                }                // Convert key to spec                DESKeySpec desKeySpec                    = (DESKeySpec)engineGetKeySpec(key, DESKeySpec.class);                // Create key from spec, and return it                return engineGenerateSecret(desKeySpec);             } else {                throw new InvalidKeyException                    ("Inappropriate key format/algorithm");            }         } catch (InvalidKeySpecException e) {            throw new InvalidKeyException("Cannot translate key");        }    }}