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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/key/KeyPairCodecFactory.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/key/KeyPairCodecFactory.java | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/key/KeyPairCodecFactory.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/key/KeyPairCodecFactory.java new file mode 100644 index 000000000..e68a7d65c --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/key/KeyPairCodecFactory.java @@ -0,0 +1,360 @@ +/* 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.DSSKeyPairPKCS8Codec; +import gnu.java.security.key.dss.DSSKeyPairRawCodec; +import gnu.java.security.key.dss.DSSKeyPairX509Codec; +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.RSAKeyPairPKCS8Codec; +import gnu.java.security.key.rsa.RSAKeyPairRawCodec; +import gnu.java.security.key.rsa.RSAKeyPairX509Codec; +import gnu.java.security.util.FormatUtil; + +import java.lang.reflect.Constructor; +import java.security.Key; +import java.util.Collections; +import java.util.HashSet; +import java.util.Set; + +/** + * A <i>Factory</i> class to instantiate key encoder/decoder instances. + */ +public class KeyPairCodecFactory +{ + private static Set names; + + /** Trivial constructor to enforce Singleton pattern. */ + private KeyPairCodecFactory() + { + super(); + } + + /** + * Returns the appropriate codec given a composed key-pair generator algorithm + * and an encoding format. A composed name is formed by the concatenation of + * the canonical key-pair algorithm name, the forward slash character + * <code>/</code> and the canonical name of the encoding format. + * <p> + * <b>IMPORTANT</b>: For backward compatibility, when the encoding format + * name is missing, the Raw encoding format is assumed. When this is the case + * the trailing forward slash is discarded from the name. + * + * @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(); + if (name.length() == 0) + return null; + + if (name.startsWith("/")) + return null; + + if (name.endsWith("/")) + return getInstance(name.substring(0, name.length() - 1), + Registry.RAW_ENCODING_ID); + + int i = name.indexOf("/"); + if (i == -1) + return getInstance(name, Registry.RAW_ENCODING_ID); + + String kpgName = name.substring(0, i); + String formatName = name.substring(i + 1); + return getInstance(kpgName, formatName); + } + + /** + * Returns an instance of a keypair codec given the canonical name of the + * key-pair algorithm, and the name of the encoding format to use when + * externalizing the keys. + * + * @param name the case-insensitive key-pair algorithm name. + * @param format the name of the encoding format to use when externalizing the + * keys generated by the key-pair algorithm. + * @return an instance of the key-pair codec, or <code>null</code> if none + * found. + */ + public static IKeyPairCodec getInstance(String name, String format) + { + int formatID = FormatUtil.getFormatID(format); + if (formatID == 0) + return null; + + return getInstance(name, formatID); + } + + /** + * Returns an instance of a keypair codec given the canonical name of the + * key-pair algorithm, and the identifier of the format to use when + * externalizing the keys. + * + * @param name the case-insensitive key-pair algorithm name. + * @param formatID the identifier of the format to use when externalizing the + * keys generated by the key-pair algorithm. + * @return an instance of the key-pair codec, or <code>null</code> if none + * found. + */ + public static IKeyPairCodec getInstance(String name, int formatID) + { + if (name == null) + return null; + + name = name.trim(); + switch (formatID) + { + case Registry.RAW_ENCODING_ID: + return getRawCodec(name); + case Registry.X509_ENCODING_ID: + return getX509Codec(name); + case Registry.PKCS8_ENCODING_ID: + return getPKCS8Codec(name); + } + + return null; + } + + /** + * Returns an instance of a keypair codec given a key. + * + * @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; + + String format = key.getFormat(); + int formatID = FormatUtil.getFormatID(format); + if (formatID == 0) + return null; + + switch (formatID) + { + case Registry.RAW_ENCODING_ID: + return getRawCodec(key); + case Registry.X509_ENCODING_ID: + return getX509Codec(key); + case Registry.PKCS8_ENCODING_ID: + return getPKCS8Codec(key); + } + + return null; + } + + /** + * Returns a {@link Set} of supported key-pair codec names. + * + * @return a {@link Set} of the names of supported key-pair codec (Strings). + */ + public static synchronized final Set getNames() + { + if (names == null) + { + HashSet hs = new HashSet(); + hs.add(Registry.DSS_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME); + hs.add(Registry.DSS_KPG + "/" + Registry.X509_ENCODING_SORT_NAME); + hs.add(Registry.DSS_KPG + "/" + Registry.PKCS8_ENCODING_SHORT_NAME); + hs.add(Registry.RSA_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME); + hs.add(Registry.RSA_KPG + "/" + Registry.X509_ENCODING_SORT_NAME); + hs.add(Registry.RSA_KPG + "/" + Registry.PKCS8_ENCODING_SHORT_NAME); + hs.add(Registry.DH_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME); + hs.add(Registry.SRP_KPG + "/" + Registry.RAW_ENCODING_SHORT_NAME); + names = Collections.unmodifiableSet(hs); + } + return names; + } + + 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; + } + } + + /** + * @param name the trimmed name of a key-pair algorithm. + * @return a Raw format codec for the designated key-pair algorithm, or + * <code>null</code> if none exists. + */ + private static IKeyPairCodec getRawCodec(String name) + { + 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; + } + + /** + * @param name the trimmed name of a key-pair algorithm. + * @return a X.509 format codec for the designated key-pair algorithm, or + * <code>null</code> if none exists. + */ + private static IKeyPairCodec getX509Codec(String name) + { + IKeyPairCodec result = null; + if (name.equalsIgnoreCase(Registry.DSA_KPG) + || name.equals(Registry.DSS_KPG)) + result = new DSSKeyPairX509Codec(); + else if (name.equalsIgnoreCase(Registry.RSA_KPG)) + result = new RSAKeyPairX509Codec(); + else if (name.equalsIgnoreCase(Registry.DH_KPG)) + result = makeInstance("gnu.javax.crypto.key.dh.DHKeyPairX509Codec"); + + return result; + } + + /** + * @param name the trimmed name of a key-pair algorithm. + * @return a PKCS#8 format codec for the designated key-pair algorithm, or + * <code>null</code> if none exists. + */ + private static IKeyPairCodec getPKCS8Codec(String name) + { + IKeyPairCodec result = null; + if (name.equalsIgnoreCase(Registry.DSA_KPG) + || name.equals(Registry.DSS_KPG)) + result = new DSSKeyPairPKCS8Codec(); + else if (name.equalsIgnoreCase(Registry.RSA_KPG)) + result = new RSAKeyPairPKCS8Codec(); + else if (name.equalsIgnoreCase(Registry.DH_KPG)) + result = makeInstance("gnu.javax.crypto.key.dh.DHKeyPairPKCS8Codec"); + + return result; + } + + /** + * @param key a {@link Key} for which we want to return a Raw codec. + * @return the Raw codec corresponding to the key, or <code>null</code> if + * none exists for this key. + */ + private static IKeyPairCodec getRawCodec(Key key) + { + IKeyPairCodec result = null; + if ((key instanceof DSSPublicKey) || (key instanceof DSSPrivateKey)) + result = new DSSKeyPairRawCodec(); + else if ((key instanceof GnuRSAPublicKey) + || (key instanceof GnuRSAPrivateKey)) + result = new RSAKeyPairRawCodec(); + else if (matches(key, "gnu.javax.crypto.key.dh.GnuDHPublicKey") + || 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.SRPPublicKey") + || matches(key, "gnu.javax.crypto.key.srp6.SRPPrivateKey")) + result = makeInstance("gnu.javax.crypto.key.srp6.SRPKeyPairRawCodec"); + + return result; + } + + /** + * @param key a {@link Key} for which we want to return an X.509 codec. + * @return the X.509 codec corresponding to the key, or <code>null</code> if + * none exists for this key. + */ + private static IKeyPairCodec getX509Codec(Key key) + { + IKeyPairCodec result = null; + if (key instanceof DSSPublicKey) + result = new DSSKeyPairX509Codec(); + else if (key instanceof GnuRSAPublicKey) + result = new RSAKeyPairX509Codec(); + + return result; + } + + /** + * @param key a {@link Key} for which we want to return a PKCS#8 codec. + * @return the PKCS#8 codec corresponding to the key, or <code>null</code> if + * none exists for this key. + */ + private static IKeyPairCodec getPKCS8Codec(Key key) + { + IKeyPairCodec result = null; + if (key instanceof DSSPrivateKey) + result = new DSSKeyPairPKCS8Codec(); + else if (key instanceof GnuRSAPrivateKey) + result = new RSAKeyPairPKCS8Codec(); + + return result; + } +} |