mirror of git://gcc.gnu.org/git/gcc.git
361 lines
12 KiB
Java
361 lines
12 KiB
Java
/* KeyPairCodecFactory.java --
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Copyright 2001, 2002, 2006 Free Software Foundation, Inc.
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This file is a 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 of the License, or (at
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your option) 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; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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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 gnu.java.security.key;
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import gnu.java.security.Registry;
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import gnu.java.security.key.dss.DSSKeyPairPKCS8Codec;
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import gnu.java.security.key.dss.DSSKeyPairRawCodec;
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import gnu.java.security.key.dss.DSSKeyPairX509Codec;
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import gnu.java.security.key.dss.DSSPrivateKey;
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import gnu.java.security.key.dss.DSSPublicKey;
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import gnu.java.security.key.rsa.GnuRSAPrivateKey;
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import gnu.java.security.key.rsa.GnuRSAPublicKey;
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import gnu.java.security.key.rsa.RSAKeyPairPKCS8Codec;
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import gnu.java.security.key.rsa.RSAKeyPairRawCodec;
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import gnu.java.security.key.rsa.RSAKeyPairX509Codec;
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import gnu.java.security.util.FormatUtil;
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import java.lang.reflect.Constructor;
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import java.security.Key;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* A <i>Factory</i> class to instantiate key encoder/decoder instances.
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*/
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public class KeyPairCodecFactory
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{
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private static Set names;
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/** Trivial constructor to enforce Singleton pattern. */
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private KeyPairCodecFactory()
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{
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super();
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}
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/**
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* Returns the appropriate codec given a composed key-pair generator algorithm
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* and an encoding format. A composed name is formed by the concatenation of
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* the canonical key-pair algorithm name, the forward slash character
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* <code>/</code> and the canonical name of the encoding format.
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* <p>
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* <b>IMPORTANT</b>: For backward compatibility, when the encoding format
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* name is missing, the Raw encoding format is assumed. When this is the case
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* the trailing forward slash is discarded from the name.
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*
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* @param name the case-insensitive key codec name.
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* @return an instance of the keypair codec, or <code>null</code> if none
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* found.
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*/
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public static IKeyPairCodec getInstance(String name)
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{
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if (name == null)
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return null;
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name = name.trim();
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if (name.length() == 0)
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return null;
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if (name.startsWith("/"))
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return null;
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if (name.endsWith("/"))
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return getInstance(name.substring(0, name.length() - 1),
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Registry.RAW_ENCODING_ID);
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int i = name.indexOf("/");
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if (i == -1)
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return getInstance(name, Registry.RAW_ENCODING_ID);
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String kpgName = name.substring(0, i);
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String formatName = name.substring(i + 1);
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return getInstance(kpgName, formatName);
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}
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/**
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* Returns an instance of a keypair codec given the canonical name of the
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* key-pair algorithm, and the name of the encoding format to use when
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* externalizing the keys.
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*
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* @param name the case-insensitive key-pair algorithm name.
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* @param format the name of the encoding format to use when externalizing the
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* keys generated by the key-pair algorithm.
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* @return an instance of the key-pair codec, or <code>null</code> if none
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* found.
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*/
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public static IKeyPairCodec getInstance(String name, String format)
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{
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int formatID = FormatUtil.getFormatID(format);
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if (formatID == 0)
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return null;
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return getInstance(name, formatID);
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}
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/**
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* Returns an instance of a keypair codec given the canonical name of the
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* key-pair algorithm, and the identifier of the format to use when
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* externalizing the keys.
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*
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* @param name the case-insensitive key-pair algorithm name.
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* @param formatID the identifier of the format to use when externalizing the
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* keys generated by the key-pair algorithm.
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* @return an instance of the key-pair codec, or <code>null</code> if none
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* found.
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*/
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public static IKeyPairCodec getInstance(String name, int formatID)
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{
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if (name == null)
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return null;
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name = name.trim();
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switch (formatID)
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{
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case Registry.RAW_ENCODING_ID:
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return getRawCodec(name);
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case Registry.X509_ENCODING_ID:
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return getX509Codec(name);
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case Registry.PKCS8_ENCODING_ID:
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return getPKCS8Codec(name);
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}
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return null;
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}
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/**
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* Returns an instance of a keypair codec given a key.
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*
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* @param key the key to encode.
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* @return an instance of the keypair codec, or <code>null</code> if none
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* found.
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*/
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public static IKeyPairCodec getInstance(Key key)
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{
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if (key == null)
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return null;
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String format = key.getFormat();
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int formatID = FormatUtil.getFormatID(format);
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if (formatID == 0)
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return null;
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switch (formatID)
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{
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case Registry.RAW_ENCODING_ID:
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return getRawCodec(key);
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case Registry.X509_ENCODING_ID:
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return getX509Codec(key);
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case Registry.PKCS8_ENCODING_ID:
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return getPKCS8Codec(key);
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}
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return null;
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}
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/**
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* Returns a {@link Set} of supported key-pair codec names.
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*
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* @return a {@link Set} of the names of supported key-pair codec (Strings).
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*/
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public static synchronized final Set getNames()
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{
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if (names == null)
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{
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HashSet hs = new HashSet();
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hs.add(Registry.DSS_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME);
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hs.add(Registry.DSS_KPG + "/" + Registry.X509_ENCODING_SORT_NAME);
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hs.add(Registry.DSS_KPG + "/" + Registry.PKCS8_ENCODING_SHORT_NAME);
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hs.add(Registry.RSA_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME);
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hs.add(Registry.RSA_KPG + "/" + Registry.X509_ENCODING_SORT_NAME);
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hs.add(Registry.RSA_KPG + "/" + Registry.PKCS8_ENCODING_SHORT_NAME);
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hs.add(Registry.DH_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME);
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hs.add(Registry.SRP_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME);
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names = Collections.unmodifiableSet(hs);
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}
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return names;
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}
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private static IKeyPairCodec makeInstance (String clazz)
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{
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try
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{
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Class c = Class.forName (clazz);
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Constructor ctor = c.getConstructor (new Class[0]);
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return (IKeyPairCodec) ctor.newInstance (new Object[0]);
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}
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catch (Exception x)
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{
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IllegalArgumentException iae =
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new IllegalArgumentException ("strong crypto key codec not available: "
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+ clazz);
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iae.initCause (x);
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throw iae;
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}
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}
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private static boolean matches (Object o, String clazz)
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{
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try
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{
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Class c = Class.forName (clazz);
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return c.isAssignableFrom (o.getClass ());
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}
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catch (Exception x)
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{
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// Can't match.
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return false;
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}
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}
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/**
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* @param name the trimmed name of a key-pair algorithm.
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* @return a Raw format codec for the designated key-pair algorithm, or
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* <code>null</code> if none exists.
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*/
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private static IKeyPairCodec getRawCodec(String name)
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{
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IKeyPairCodec result = null;
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if (name.equalsIgnoreCase(Registry.DSA_KPG)
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|| name.equals(Registry.DSS_KPG))
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result = new DSSKeyPairRawCodec();
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else if (name.equalsIgnoreCase(Registry.RSA_KPG))
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result = new RSAKeyPairRawCodec();
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else if (name.equalsIgnoreCase(Registry.DH_KPG))
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result = makeInstance("gnu.javax.crypto.key.dh.DHKeyPairRawCodec");
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else if (name.equalsIgnoreCase(Registry.SRP_KPG))
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result = makeInstance("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec");
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return result;
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}
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/**
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* @param name the trimmed name of a key-pair algorithm.
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* @return a X.509 format codec for the designated key-pair algorithm, or
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* <code>null</code> if none exists.
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*/
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private static IKeyPairCodec getX509Codec(String name)
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{
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IKeyPairCodec result = null;
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if (name.equalsIgnoreCase(Registry.DSA_KPG)
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|| name.equals(Registry.DSS_KPG))
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result = new DSSKeyPairX509Codec();
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else if (name.equalsIgnoreCase(Registry.RSA_KPG))
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result = new RSAKeyPairX509Codec();
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else if (name.equalsIgnoreCase(Registry.DH_KPG))
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result = makeInstance("gnu.javax.crypto.key.dh.DHKeyPairX509Codec");
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return result;
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}
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/**
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* @param name the trimmed name of a key-pair algorithm.
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* @return a PKCS#8 format codec for the designated key-pair algorithm, or
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* <code>null</code> if none exists.
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*/
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private static IKeyPairCodec getPKCS8Codec(String name)
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{
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IKeyPairCodec result = null;
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if (name.equalsIgnoreCase(Registry.DSA_KPG)
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|| name.equals(Registry.DSS_KPG))
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result = new DSSKeyPairPKCS8Codec();
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else if (name.equalsIgnoreCase(Registry.RSA_KPG))
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result = new RSAKeyPairPKCS8Codec();
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else if (name.equalsIgnoreCase(Registry.DH_KPG))
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result = makeInstance("gnu.javax.crypto.key.dh.DHKeyPairPKCS8Codec");
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return result;
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}
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/**
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* @param key a {@link Key} for which we want to return a Raw codec.
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* @return the Raw codec corresponding to the key, or <code>null</code> if
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* none exists for this key.
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*/
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private static IKeyPairCodec getRawCodec(Key key)
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{
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IKeyPairCodec result = null;
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if ((key instanceof DSSPublicKey) || (key instanceof DSSPrivateKey))
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result = new DSSKeyPairRawCodec();
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else if ((key instanceof GnuRSAPublicKey)
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|| (key instanceof GnuRSAPrivateKey))
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result = new RSAKeyPairRawCodec();
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else if (matches(key, "gnu.javax.crypto.key.dh.GnuDHPublicKey")
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|| matches(key, "gnu.javax.crypto.key.dh.GnuDHPrivateKey"))
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result = makeInstance("gnu.javax.crypto.key.dh.DHKeyPairRawCodec");
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else if (matches(key, "gnu.javax.crypto.key.srp6.SRPPublicKey")
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|| matches(key, "gnu.javax.crypto.key.srp6.SRPPrivateKey"))
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result = makeInstance("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec");
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return result;
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}
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/**
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* @param key a {@link Key} for which we want to return an X.509 codec.
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* @return the X.509 codec corresponding to the key, or <code>null</code> if
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* none exists for this key.
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*/
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private static IKeyPairCodec getX509Codec(Key key)
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{
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IKeyPairCodec result = null;
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if (key instanceof DSSPublicKey)
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result = new DSSKeyPairX509Codec();
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else if (key instanceof GnuRSAPublicKey)
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result = new RSAKeyPairX509Codec();
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return result;
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}
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/**
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* @param key a {@link Key} for which we want to return a PKCS#8 codec.
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* @return the PKCS#8 codec corresponding to the key, or <code>null</code> if
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* none exists for this key.
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*/
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private static IKeyPairCodec getPKCS8Codec(Key key)
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{
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IKeyPairCodec result = null;
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if (key instanceof DSSPrivateKey)
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result = new DSSKeyPairPKCS8Codec();
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else if (key instanceof GnuRSAPrivateKey)
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result = new RSAKeyPairPKCS8Codec();
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return result;
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}
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}
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