001 /* $RCSfile: DES1KeySecretKeyFactoryEngine.java,v $
002 * $Revision: 1.9 $
003 * $Date: 2003/10/04 19:18:38 $
004 * $Author: uwe_guenther $
005 * $State: Exp $
006 *
007 * Created on August 13, 2001 9:45 PM
008 *
009 * Copyright (C) 2001 Uwe Guenther <uwe@cscc.de>
010 *
011 * This file is part of the jhbci JCE-ServiceProvider. The jhbci JCE-
012 * ServiceProvider is a library, written in JavaTM, that should be
013 * used in HBCI banking applications (clients and may be servers),
014 * to do cryptographic operations.
015 *
016 * The jhbci library is free software; you can redistribute it and/or
017 * modify it under the terms of the GNU Lesser General Public
018 * License as published by the Free Software Foundation; either
019 * version 2.1 of the License, or (at your option) any later version.
020 *
021 * The jhbci library is distributed in the hope that it will be useful,
022 * but WITHOUT ANY WARRANTY; without even the implied warranty of
023 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
024 * Lesser General Public License for more details.
025 *
026 * You should have received a copy of the GNU Lesser General Public
027 * License along with this library; if not, write to the Free Software
028 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
029 *
030 */
031
032 package de.cscc.crypto.provider;
033
034 import java.security.InvalidKeyException;
035 import java.security.spec.InvalidKeySpecException;
036 import java.security.spec.KeySpec;
037
038 import javax.crypto.SecretKey;
039 import javax.crypto.SecretKeyFactorySpi;
040
041
042 /**
043 * DES1KeySecretKeyFactoryEngine Class.
044 *
045 * @author <a href=mailto:uwe@cscc.de>Uwe Günther</a>
046 * @version $Revision: 1.9 $
047 */
048 public final class DES1KeySecretKeyFactoryEngine extends SecretKeyFactorySpi {
049
050 /** The delegate for this wrapper object */
051 private DES1KeySecretKeyFactoryImpl factory =
052 new DES1KeySecretKeyFactoryImpl();
053
054 /**
055 * Creates new DES1KeySecretKeyFactoryEngine.
056 *
057 * @throws SecurityException if the provider self integrity check fails.
058 */
059 public DES1KeySecretKeyFactoryEngine() {
060 if (JHBCI.selfIntegrityChecking() == false) {
061 throw new SecurityException("JHBCI-Provider is tampered.");
062 }
063 }
064
065 /**
066 * Returns a string representation of the object.
067 *
068 * @return a string representation of the object.
069 */
070 public String toString() {
071 return this.factory.toString();
072 }
073
074 /**
075 * Generates a <code>SecretKey</code> object from the
076 * provided key specification (key material).
077 *
078 * @param keySpec the specification (key material) of the secret key.
079 * @return the secret key.
080 * @throws NullPointerException if keySpec is null.
081 * @throws InvalidKeySpecException if the given key specification
082 * is inappropriate for this secret-key factory to produce a secret key.
083 */
084 protected SecretKey engineGenerateSecret(KeySpec keySpec)
085 throws InvalidKeySpecException {
086 return this.factory.generateSecret(keySpec);
087 }
088
089
090 /**
091 * Returns a specification (key material) of the given key object in the
092 * requested format.
093 *
094 * @param key the key.
095 * @param keySpec the requested format in which the key material shall be
096 * returned.
097 * @return the underlying key specification (key material) in the requested
098 * format.
099 * @throws NullPointerException if key or keySpec is null.
100 * @throws InvalidKeySpecException if the requested key specification is
101 * inappropriate for the given key (e.g., the algorithms associated with
102 * <code>key</code> and <code>keySpec</code> do not match, or
103 * <code>key</code> references a key on a cryptographic hardware device
104 * whereas <code>keySpec</code> is the specification of a software-based
105 * key), or the given key cannot be dealt with (e.g., the given key has
106 * an algorithm or format not supported by this secret-key factory).
107 */
108 protected KeySpec engineGetKeySpec(SecretKey key, Class keySpec)
109 throws InvalidKeySpecException {
110 return this.factory.getKeySpec(key, keySpec);
111 }
112
113 /**
114 * Translates a key object, whose provider may be unknown or potentially
115 * untrusted, into a corresponding key object of this secret-key factory.
116 *
117 * @return they key whose provider is unknown or untrusted.
118 * @param key the key whose provider is unknown or untrusted.
119 * @throws NullPointerException if key is null.
120 * @throws InvalidKeyException if the given key cannot be processed by this
121 * secret-key factory.
122 */
123 protected SecretKey engineTranslateKey(SecretKey key)
124 throws InvalidKeyException {
125 return this.factory.translateKey(key);
126 }
127
128 }