diff options
Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/mac/MacFactory.java')
| -rw-r--r-- | libjava/classpath/gnu/javax/crypto/mac/MacFactory.java | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/mac/MacFactory.java b/libjava/classpath/gnu/javax/crypto/mac/MacFactory.java new file mode 100644 index 00000000000..d8f8bcfcee6 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/mac/MacFactory.java @@ -0,0 +1,164 @@ +/* MacFactory.java -- + Copyright (C) 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.javax.crypto.mac; + +import gnu.java.security.Registry; +import gnu.javax.crypto.cipher.CipherFactory; +import gnu.javax.crypto.cipher.IBlockCipher; + +import java.util.Collections; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Set; + +/** + * <p>A <i>Factory</i> that instantiates instances of every supported Message + * Authentication Code algorithms, including all <i>HMAC</i> algorithms.</p> + */ +public class MacFactory implements Registry +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + // Constructor(s) + // ------------------------------------------------------------------------- + + /** Trivial constructor to enforce <i>Singleton</i> pattern. */ + private MacFactory() + { + super(); + } + + // Class methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns an instance of a <i>MAC</i> algorithm given its name.</p> + * + * @param name the name of the MAC algorithm. + * @return an instance of the <i>MAC</i> algorithm, or <code>null</code> if + * none can be constructed. + * @exception InternalError if the implementation does not pass its self-test. + */ + public static IMac getInstance(String name) + { + if (name == null) + { + return null; + } + + name = name.trim(); + name = name.toLowerCase(); + if (name.startsWith(HMAC_NAME_PREFIX)) + { + return HMacFactory.getInstance(name); + } + + if (name.startsWith(OMAC_PREFIX)) + { + name = name.substring(OMAC_PREFIX.length()); + IBlockCipher cipher = CipherFactory.getInstance(name); + if (cipher == null) + { + return null; + } + return new OMAC(cipher); + } + + IMac result = null; + if (name.equalsIgnoreCase(UHASH32)) + { + result = new UHash32(); + } + else if (name.equalsIgnoreCase(UMAC32)) + { + result = new UMac32(); + } + else if (name.equalsIgnoreCase(TMMH16)) + { + result = new TMMH16(); + } + // else if (name.equalsIgnoreCase(TMMH32)) { + // result = new TMMH32(); + // } + + if (result != null && !result.selfTest()) + { + throw new InternalError(result.name()); + } + + return result; + } + + /** + * <p>Returns a {@link java.util.Set} of names of <i>MAC</i> algorithms + * supported by this <i>Factory</i>.</p> + * + * @return a {@link java.util.Set} of MAC names (Strings). + */ + public static final Set getNames() + { + synchronized (MacFactory.class) + { + if (names == null) + { + HashSet hs = new HashSet(); + hs.addAll(HMacFactory.getNames()); + hs.add(UHASH32); + hs.add(UMAC32); + hs.add(TMMH16); + // hs.add(TMMH32); + + for (Iterator it = CipherFactory.getNames().iterator(); it.hasNext();) + { + hs.add(OMAC_PREFIX + it.next()); + } + + names = Collections.unmodifiableSet(hs); + } + } + return names; + } + + private static Set names; + + // Instance methods + // ------------------------------------------------------------------------- +}
\ No newline at end of file |
