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author | Mark Wielaard <mark@gcc.gnu.org> | 2006-03-10 21:46:48 +0000 |
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committer | Mark Wielaard <mark@gcc.gnu.org> | 2006-03-10 21:46:48 +0000 |
commit | 8aa540d2f783474d1d2e06f16744bf67b9c1facc (patch) | |
tree | ea38c56431c5d4528fb54254c3f8e50f517bede3 /libjava/classpath/gnu/javax/crypto/prng/UMacGenerator.java | |
parent | 27079765d00123f8e53d0e1ef7f9d46559266e6d (diff) | |
download | gcc-8aa540d2f783474d1d2e06f16744bf67b9c1facc.tar.gz |
Imported GNU Classpath 0.90
Imported GNU Classpath 0.90
* scripts/makemake.tcl: Set gnu/java/awt/peer/swing to ignore.
* gnu/classpath/jdwp/VMFrame.java (SIZE): New constant.
* java/lang/VMCompiler.java: Use gnu.java.security.hash.MD5.
* java/lang/Math.java: New override file.
* java/lang/Character.java: Merged from Classpath.
(start, end): Now 'int's.
(canonicalName): New field.
(CANONICAL_NAME, NO_SPACES_NAME, CONSTANT_NAME): New constants.
(UnicodeBlock): Added argument.
(of): New overload.
(forName): New method.
Updated unicode blocks.
(sets): Updated.
* sources.am: Regenerated.
* Makefile.in: Likewise.
From-SVN: r111942
Diffstat (limited to 'libjava/classpath/gnu/javax/crypto/prng/UMacGenerator.java')
-rw-r--r-- | libjava/classpath/gnu/javax/crypto/prng/UMacGenerator.java | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/prng/UMacGenerator.java b/libjava/classpath/gnu/javax/crypto/prng/UMacGenerator.java new file mode 100644 index 00000000000..0e3725ce986 --- /dev/null +++ b/libjava/classpath/gnu/javax/crypto/prng/UMacGenerator.java @@ -0,0 +1,228 @@ +/* UMacGenerator.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.prng; + +import gnu.java.security.Registry; +import gnu.java.security.prng.BasePRNG; +import gnu.java.security.prng.LimitReachedException; +import gnu.javax.crypto.cipher.CipherFactory; +import gnu.javax.crypto.cipher.IBlockCipher; + +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; +import java.security.InvalidKeyException; + +/** + * <p><i>KDF</i>s (Key Derivation Functions) are used to stretch user-supplied + * key material to specific size(s) required by high level cryptographic + * primitives. Described in the <A + * HREF="http://www.ietf.org/internet-drafts/draft-krovetz-umac-01.txt">UMAC</A> + * paper, this function basically operates an underlying <em>symmetric key block + * cipher</em> instance in output feedback mode (OFB), as a <b>strong</b> + * pseudo-random number generator.</p> + * + * <p><code>UMacGenerator</code> requires an <em>index</em> parameter + * (initialisation parameter <code>gnu.crypto.prng.umac.kdf.index</code> taken + * to be an instance of {@link java.lang.Integer} with a value between + * <code>0</code> and <code>255</code>). Using the same key, but different + * indices, generates different pseudorandom outputs.</p> + * + * <p>This implementation generalises the definition of the + * <code>UmacGenerator</code> algorithm to allow for other than the AES symetric + * key block cipher algorithm (initialisation parameter + * <code>gnu.crypto.prng.umac.cipher.name</code> taken to be an instance of + * {@link java.lang.String}). If such a parameter is not defined/included in the + * initialisation <code>Map</code>, then the "Rijndael" algorithm is used. + * Furthermore, if the initialisation parameter + * <code>gnu.crypto.cipher.block.size</code> (taken to be a instance of {@link + * java.lang.Integer}) is missing or undefined in the initialisation <code>Map + * </code>, then the cipher's <em>default</em> block size is used.</p> + * + * <p><b>NOTE</b>: Rijndael is used as the default symmetric key block cipher + * algorithm because, with its default block and key sizes, it is the AES. Yet + * being Rijndael, the algorithm offers more versatile block and key sizes which + * may prove to be useful for generating "longer" key streams.</p> + * + * <p>References:</p> + * + * <ol> + * <li><a href="http://www.ietf.org/internet-drafts/draft-krovetz-umac-01.txt"> + * UMAC</a>: Message Authentication Code using Universal Hashing.<br> + * T. Krovetz, J. Black, S. Halevi, A. Hevia, H. Krawczyk, and P. Rogaway.</li> + * </ol> + */ +public class UMacGenerator extends BasePRNG implements Cloneable +{ + + // Constants and variables + // ------------------------------------------------------------------------- + + /** + * <p>Property name of the KDF <code>index</code> value to use in this + * instance. The value is taken to be an {@link Integer} less than + * <code>256</code>.</p> + */ + public static final String INDEX = "gnu.crypto.prng.umac.index"; + + /** The name of the underlying symmetric key block cipher algorithm. */ + public static final String CIPHER = "gnu.crypto.prng.umac.cipher.name"; + + /** The generator's underlying block cipher. */ + private IBlockCipher cipher; + + // Constructor(s) + // ------------------------------------------------------------------------- + + /** Trivial 0-arguments constructor. */ + public UMacGenerator() + { + super(Registry.UMAC_PRNG); + } + + // Class methods + // ------------------------------------------------------------------------- + + // Instance methods + // ------------------------------------------------------------------------- + + // Implementation of abstract methods in BasePRNG -------------------------- + + public void setup(Map attributes) + { + boolean newCipher = true; + String cipherName = (String) attributes.get(CIPHER); + if (cipherName == null) + { + if (cipher == null) + { // happy birthday + cipher = CipherFactory.getInstance(Registry.RIJNDAEL_CIPHER); + } + else + { // we already have one. use it as is + newCipher = false; + } + } + else + { + cipher = CipherFactory.getInstance(cipherName); + } + + // find out what block size we should use it in + int cipherBlockSize = 0; + Integer bs = (Integer) attributes.get(IBlockCipher.CIPHER_BLOCK_SIZE); + if (bs != null) + { + cipherBlockSize = bs.intValue(); + } + else + { + if (newCipher) + { // assume we'll use its default block size + cipherBlockSize = cipher.defaultBlockSize(); + } // else use as is + } + + // get the key material + byte[] key = (byte[]) attributes.get(IBlockCipher.KEY_MATERIAL); + if (key == null) + { + throw new IllegalArgumentException(IBlockCipher.KEY_MATERIAL); + } + + int keyLength = key.length; + // ensure that keyLength is valid for the chosen underlying cipher + boolean ok = false; + for (Iterator it = cipher.keySizes(); it.hasNext();) + { + ok = (keyLength == ((Integer) it.next()).intValue()); + if (ok) + { + break; + } + } + if (!ok) + { + throw new IllegalArgumentException("key length"); + } + + // ensure that remaining params make sense + int index = -1; + Integer i = (Integer) attributes.get(INDEX); + if (i != null) + { + index = i.intValue(); + if (index < 0 || index > 255) + { + throw new IllegalArgumentException(INDEX); + } + } + + // now initialise the underlying cipher + Map map = new HashMap(); + if (cipherBlockSize != 0) + { // only needed if new or changed + map.put(IBlockCipher.CIPHER_BLOCK_SIZE, new Integer(cipherBlockSize)); + } + map.put(IBlockCipher.KEY_MATERIAL, key); + try + { + cipher.init(map); + } + catch (InvalidKeyException x) + { + throw new IllegalArgumentException(IBlockCipher.KEY_MATERIAL); + } + + buffer = new byte[cipher.currentBlockSize()]; + buffer[cipher.currentBlockSize() - 1] = (byte) index; + try + { + fillBlock(); + } + catch (LimitReachedException impossible) + { + } + } + + public void fillBlock() throws LimitReachedException + { + cipher.encryptBlock(buffer, 0, buffer, 0); + } +}
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