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Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/pad/PadFactory.java')
| -rw-r--r-- | libjava/classpath/gnu/javax/crypto/pad/PadFactory.java | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/pad/PadFactory.java b/libjava/classpath/gnu/javax/crypto/pad/PadFactory.java new file mode 100644 index 00000000000..e122719b62b --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/pad/PadFactory.java @@ -0,0 +1,136 @@ +/* PadFactory.java -- + Copyright (C) 2001, 2002, 2003, 2004, 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.pad; + +import gnu.java.security.Registry; + +import java.util.Collections; +import java.util.HashSet; +import java.util.Set; + +/** + * <p>A Factory to instantiate padding schemes.</p> + */ +public class PadFactory implements Registry +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + // Constructor(s) + // ------------------------------------------------------------------------- + + /** Trivial constructor to enforce Singleton pattern. */ + private PadFactory() + { + super(); + } + + // Class methods + // ------------------------------------------------------------------------- + + /** + * <p>Returns an instance of a padding algorithm given its name.</p> + * + * @param pad the case-insensitive name of the padding algorithm. + * @return an instance of the padding algorithm, operating with a given + * block size, or <code>null</code> if none found. + * @throws InternalError if the implementation does not pass its self-test. + */ + public static final IPad getInstance(String pad) + { + if (pad == null) + { + return null; + } + + pad = pad.trim().toLowerCase(); + if (pad.endsWith("padding")) + pad = pad.substring(0, pad.length() - "padding".length()); + IPad result = null; + if (pad.equals(PKCS7_PAD)) + { + result = new PKCS7(); + } + else if (pad.equals(TBC_PAD)) + { + result = new TBC(); + } + else if (pad.equals(EME_PKCS1_V1_5_PAD)) + { + result = new PKCS1_V1_5(); + } + else if (pad.equals(SSL3_PAD)) + { + result = new SSL3(); + } + else if (pad.equals(TLS1_PAD)) + { + result = new TLS1(); + } + + if (result != null && !result.selfTest()) + { + throw new InternalError(result.name()); + } + + return result; + } + + /** + * <p>Returns a {@link java.util.Set} of names of padding algorithms + * supported by this <i>Factory</i>.</p> + * + * @return a {@link Set} of padding algorithm names (Strings). + */ + public static final Set getNames() + { + HashSet hs = new HashSet(); + hs.add(PKCS7_PAD); + hs.add(TBC_PAD); + hs.add(EME_PKCS1_V1_5_PAD); + hs.add(SSL3_PAD); + hs.add(TLS1_PAD); + + return Collections.unmodifiableSet(hs); + } + + // Instance methods + // ------------------------------------------------------------------------- +}
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