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Diffstat (limited to 'gnu/java/security/key/KeyPairCodecFactory.java')
| -rw-r--r-- | gnu/java/security/key/KeyPairCodecFactory.java | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/gnu/java/security/key/KeyPairCodecFactory.java b/gnu/java/security/key/KeyPairCodecFactory.java new file mode 100644 index 000000000..0bf9e6657 --- /dev/null +++ b/gnu/java/security/key/KeyPairCodecFactory.java @@ -0,0 +1,263 @@ +/* KeyPairCodecFactory.java -- + Copyright 2001, 2002, 2006 Free Software Foundation, Inc. + +This file is a 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 +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 gnu.java.security.key; + +import gnu.java.security.Registry; +import gnu.java.security.key.dss.DSSKeyPairRawCodec; +import gnu.java.security.key.dss.DSSPrivateKey; +import gnu.java.security.key.dss.DSSPublicKey; +import gnu.java.security.key.rsa.GnuRSAPrivateKey; +import gnu.java.security.key.rsa.GnuRSAPublicKey; +import gnu.java.security.key.rsa.RSAKeyPairRawCodec; + +import java.lang.reflect.Constructor; +import java.util.Set; +import java.security.Key; +import java.security.PrivateKey; +import java.security.PublicKey; + +/** + * <p>A <i>Factory</i> class to instantiate key encoder/decoder instances.</p> + * + * @version $Revision: 1.1 $ + */ +public class KeyPairCodecFactory +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + // Constructor(s) + // ------------------------------------------------------------------------- + + /** Trivial constructor to enforce Singleton pattern. */ + private KeyPairCodecFactory() + { + super(); + } + + // Class methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns an instance of a keypair codec given its name.</p> + * + * @param name the case-insensitive key codec name. + * @return an instance of the keypair codec, or <code>null</code> if none + * found. + */ + public static IKeyPairCodec getInstance(String name) + { + if (name == null) + { + return null; + } + + name = name.trim(); + IKeyPairCodec result = null; + if (name.equalsIgnoreCase(Registry.DSA_KPG) + || name.equals(Registry.DSS_KPG)) + { + result = new DSSKeyPairRawCodec(); + } + else if (name.equalsIgnoreCase(Registry.RSA_KPG)) + { + result = new RSAKeyPairRawCodec(); + } + else if (name.equalsIgnoreCase(Registry.DH_KPG)) + { + result = makeInstance ("gnu.javax.crypto.key.dh.DHKeyPairRawCodec"); + } + else if (name.equalsIgnoreCase(Registry.SRP_KPG)) + { + result = makeInstance ("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec"); + } + + return result; + } + + /** + * <p>Returns an instance of a keypair codec given a byte array that is + * assumed to contain a previously encoded key (public or private).</p> + * + * @param buffer a byte array containing a previously encoded key. + * @return an instance of the keypair codec, or <code>null</code> if none + * found. + */ + public static IKeyPairCodec getInstance(byte[] buffer) + { + if (buffer == null) + { + return null; + } + // our codecs prefix the stream with a 4-byte magic + if (buffer.length < 5) + { + return null; + } + // the first byte is always 0x47 + if (buffer[0] != 0x47) + { + return null; + } + // so far we only have RAW codecs + if (buffer[1] != Registry.RAW_ENCODING_ID) + { + return null; + } + IKeyPairCodec result = null; + switch (buffer[2]) + { + case 0x44: + result = new DSSKeyPairRawCodec(); + break; + case 0x52: + result = new RSAKeyPairRawCodec(); + break; + case 0x48: + result = makeInstance ("gnu.javax.crypto.key.dh.DHKeyPairRawCodec"); + break; + case 0x53: + result = makeInstance ("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec"); + break; + } + + return result; + } + + /** + * <p>Returns an instance of a keypair codec given a key.</p> + * + * @param key the key to encode. + * @return an instance of the keypair codec, or <code>null</code> if none + * found. + */ + public static IKeyPairCodec getInstance(Key key) + { + if (key == null) + { + return null; + } + + IKeyPairCodec result = null; + if (key instanceof PublicKey) + { + if (key instanceof DSSPublicKey) + { + result = new DSSKeyPairRawCodec(); + } + else if (key instanceof GnuRSAPublicKey) + { + result = new RSAKeyPairRawCodec(); + } + else if (matches (key, "gnu.javax.crypto.key.dh.GnuDHPublicKey")) + { + result = makeInstance ("gnu.javax.crypto.key.dh.DHKeyPairRawCodec"); + } + else if (matches (key, "gnu.javax.crypto.key.srp6.SRPPublicKey")) + { + result = makeInstance ("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec"); + } + } + else if (key instanceof PrivateKey) + { + if (key instanceof DSSPrivateKey) + { + result = new DSSKeyPairRawCodec(); + } + else if (key instanceof GnuRSAPrivateKey) + { + result = new RSAKeyPairRawCodec(); + } + else if (matches (key, "gnu.javax.crypto.key.dh.GnuDHPrivateKey")) + { + result = makeInstance ("gnu.javax.crypto.key.dh.DHKeyPairRawCodec"); + } + else if (matches (key, "gnu.javax.crypto.key.srp6.SRPPrivateKey")) + { + result = makeInstance ("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec"); + } + } + + return result; + } + + /** + * <p>Returns a {@link Set} of keypair codec names supported by this + * <i>Factory</i>.</p> + * + * @return a {@link Set} of keypair codec names (Strings). + */ + public static final Set getNames() + { + return KeyPairGeneratorFactory.getNames(); + } + + private static IKeyPairCodec makeInstance (String clazz) + { + try + { + Class c = Class.forName (clazz); + Constructor ctor = c.getConstructor (new Class[0]); + return (IKeyPairCodec) ctor.newInstance (new Object[0]); + } + catch (Exception x) + { + IllegalArgumentException iae = + new IllegalArgumentException ("strong crypto key codec not available: " + + clazz); + iae.initCause (x); + throw iae; + } + } + + private static boolean matches (Object o, String clazz) + { + try + { + Class c = Class.forName (clazz); + return c.isAssignableFrom (o.getClass ()); + } + catch (Exception x) + { + // Can't match. + return false; + } + } +} |