4f9533c772
Imported GNU Classpath 0.90
* scripts/makemake.tcl: LocaleData.java moved to gnu/java/locale.
* sources.am: Regenerated.
* gcj/javaprims.h: Regenerated.
* Makefile.in: Regenerated.
* gcj/Makefile.in: Regenerated.
* include/Makefile.in: Regenerated.
* testsuite/Makefile.in: Regenerated.
* gnu/java/lang/VMInstrumentationImpl.java: New override.
* gnu/java/net/local/LocalSocketImpl.java: Likewise.
* gnu/classpath/jdwp/VMMethod.java: Likewise.
* gnu/classpath/jdwp/VMVirtualMachine.java: Update to latest
interface.
* java/lang/Thread.java: Add UncaughtExceptionHandler.
* java/lang/reflect/Method.java: Implements GenericDeclaration and
isSynthetic(),
* java/lang/reflect/Field.java: Likewise.
* java/lang/reflect/Constructor.java
* java/lang/Class.java: Implements Type, GenericDeclaration,
getSimpleName() and getEnclosing*() methods.
* java/lang/Class.h: Add new public methods.
* java/lang/Math.java: Add signum(), ulp() and log10().
* java/lang/natMath.cc (log10): New function.
* java/security/VMSecureRandom.java: New override.
* java/util/logging/Logger.java: Updated to latest classpath
version.
* java/util/logging/LogManager.java: New override.
From-SVN: r113887
301 lines
10 KiB
Java
301 lines
10 KiB
Java
/* MD2.java --
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Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.hash;
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import gnu.java.security.Registry;
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import gnu.java.security.util.Util;
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/**
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* <p>An implementation of the MD2 message digest algorithm.</p>
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*
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* <p>MD2 is not widely used. Unless it is needed for compatibility with
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* existing systems, it is not recommended for use in new applications.</p>
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*
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* <p>References:</p>
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*
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* <ol>
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* <li>The <a href="http://www.ietf.org/rfc/rfc1319.txt">MD2</a>
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* Message-Digest Algorithm.<br>
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* B. Kaliski.</li>
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* <li>The <a href="http://www.rfc-editor.org/errata.html">RFC ERRATA PAGE</a>
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* under section RFC 1319.</li>
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* </ol>
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*/
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public class MD2 extends BaseHash
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{
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// Constants and variables
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// -------------------------------------------------------------------------
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/** An MD2 message digest is always 128-bits long, or 16 bytes. */
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private static final int DIGEST_LENGTH = 16;
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/** The MD2 algorithm operates on 128-bit blocks, or 16 bytes. */
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private static final int BLOCK_LENGTH = 16;
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/** 256 byte "random" permutation of the digits of pi. */
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private static final byte[] PI = { 41, 46, 67, -55, -94, -40, 124, 1, 61, 54,
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84, -95, -20, -16, 6, 19, 98, -89, 5, -13,
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-64, -57, 115, -116, -104, -109, 43, -39,
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-68, 76, -126, -54, 30, -101, 87, 60, -3,
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-44, -32, 22, 103, 66, 111, 24, -118, 23,
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-27, 18, -66, 78, -60, -42, -38, -98, -34,
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73, -96, -5, -11, -114, -69, 47, -18, 122,
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-87, 104, 121, -111, 21, -78, 7, 63, -108,
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-62, 16, -119, 11, 34, 95, 33, -128, 127,
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93, -102, 90, -112, 50, 39, 53, 62, -52,
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-25, -65, -9, -105, 3, -1, 25, 48, -77, 72,
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-91, -75, -47, -41, 94, -110, 42, -84, 86,
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-86, -58, 79, -72, 56, -46, -106, -92, 125,
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-74, 118, -4, 107, -30, -100, 116, 4, -15,
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69, -99, 112, 89, 100, 113, -121, 32, -122,
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91, -49, 101, -26, 45, -88, 2, 27, 96, 37,
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-83, -82, -80, -71, -10, 28, 70, 97, 105,
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52, 64, 126, 15, 85, 71, -93, 35, -35, 81,
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-81, 58, -61, 92, -7, -50, -70, -59, -22,
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38, 44, 83, 13, 110, -123, 40, -124, 9,
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-45, -33, -51, -12, 65, -127, 77, 82, 106,
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-36, 55, -56, 108, -63, -85, -6, 36, -31,
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123, 8, 12, -67, -79, 74, 120, -120, -107,
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-117, -29, 99, -24, 109, -23, -53, -43, -2,
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59, 0, 29, 57, -14, -17, -73, 14, 102, 88,
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-48, -28, -90, 119, 114, -8, -21, 117, 75,
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10, 49, 68, 80, -76, -113, -19, 31, 26,
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-37, -103, -115, 51, -97, 17, -125, 20 };
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/** The output of this message digest when no data has been input. */
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private static final String DIGEST0 = "8350E5A3E24C153DF2275C9F80692773";
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/** caches the result of the correctness test, once executed. */
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private static Boolean valid;
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/** The checksum computed so far. */
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private byte[] checksum;
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/**
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* Work array needed by encrypt method. First <code>BLOCK_LENGTH</code> bytes
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* are also used to store the running digest.
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*/
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private byte[] work;
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// Constructor(s)
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// -------------------------------------------------------------------------
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/** Creates a new MD2 digest ready for use. */
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public MD2()
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{
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super(Registry.MD2_HASH, DIGEST_LENGTH, BLOCK_LENGTH);
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}
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/**
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* <p>Private constructor used for cloning.</p>
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*
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* @param md2 the instance to clone.
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*/
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private MD2(MD2 md2)
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{
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this();
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// superclass field
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this.count = md2.count;
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this.buffer = (byte[]) md2.buffer.clone();
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// private field
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this.checksum = (byte[]) md2.checksum.clone();
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this.work = (byte[]) md2.work.clone();
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}
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// Class methods
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// -------------------------------------------------------------------------
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// Instance methods
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// -------------------------------------------------------------------------
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// java.lang.Cloneable interface implementation ----------------------------
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public Object clone()
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{
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return new MD2(this);
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}
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// Implementation of abstract methods in BaseHash --------------------------
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protected byte[] getResult()
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{
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byte[] result = new byte[DIGEST_LENGTH];
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// Encrypt checksum as last block.
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encryptBlock(checksum, 0);
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for (int i = 0; i < BLOCK_LENGTH; i++)
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{
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result[i] = work[i];
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}
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return result;
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}
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protected void resetContext()
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{
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checksum = new byte[BLOCK_LENGTH];
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work = new byte[BLOCK_LENGTH * 3];
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}
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public boolean selfTest()
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{
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if (valid == null)
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{
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valid = Boolean.valueOf(DIGEST0.equals(Util.toString(new MD2().digest())));
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}
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return valid.booleanValue();
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}
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/**
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* <p>Generates an array of padding bytes. The padding is defined as
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* <code>i</code> bytes of value <code>i</code>, where <code>i</code> is the
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* number of bytes to fill the last block of the message to
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* <code>BLOCK_LENGTH</code> bytes (or <code>BLOCK_LENGTH</code> bytes when
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* the last block was completely full).</p>
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*
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* @return the bytes to pad the remaining bytes in the buffer before
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* completing a hash operation.
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*/
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protected byte[] padBuffer()
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{
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int length = BLOCK_LENGTH - (int) (count % BLOCK_LENGTH);
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if (length == 0)
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{
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length = BLOCK_LENGTH;
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}
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byte[] pad = new byte[length];
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for (int i = 0; i < length; i++)
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{
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pad[i] = (byte) length;
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}
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return pad;
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}
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/**
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* <p>Adds <code>BLOCK_LENGTH</code> bytes to the running digest.</p>
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*
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* @param in the byte array to take the <code>BLOCK_LENGTH</code> bytes from.
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* @param off the offset to start from in the given byte array.
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*/
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protected void transform(byte[] in, int off)
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{
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// encryptBlock(in, off);
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// updateCheckSum(in, off);
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updateCheckSumAndEncryptBlock(in, off);
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}
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// Private instance methods ------------------------------------------------
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/**
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* Updates the checksum with the <code>BLOCK_LENGTH</code> bytes from the
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* given array starting at <code>off</code>.
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*/
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/*
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private void updateCheckSum(byte[] in, int off) {
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byte l = checksum[BLOCK_LENGTH-1];
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for (int i = 0; i < BLOCK_LENGTH; i++) {
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byte b = in[off+i];
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// l = (byte)((checksum[i] & 0xFF) ^ (PI[((b & 0xFF) ^ (l & 0xFF))] & 0xFF));
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l = (byte)(checksum[i] ^ PI[(b ^ l) & 0xFF]);
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checksum[i] = l;
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}
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}
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*/
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/**
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* Adds a new block (<code>BLOCK_LENGTH</code> bytes) to the running digest
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* from the given byte array starting from the given offset.
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*/
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private void encryptBlock(byte[] in, int off)
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{
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for (int i = 0; i < BLOCK_LENGTH; i++)
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{
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byte b = in[off + i];
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work[BLOCK_LENGTH + i] = b;
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work[BLOCK_LENGTH * 2 + i] = (byte) (work[i] ^ b);
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}
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byte t = 0;
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for (int i = 0; i < 18; i++)
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{
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for (int j = 0; j < 3 * BLOCK_LENGTH; j++)
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{
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// t = (byte)((work[j] & 0xFF) ^ (PI[t & 0xFF] & 0xFF));
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t = (byte) (work[j] ^ PI[t & 0xFF]);
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work[j] = t;
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}
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// t = (byte)((t + i) & 0xFF);
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t = (byte) (t + i);
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}
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}
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/**
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* Optimized method that combines a checksum update and encrypt of a block.
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*/
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private void updateCheckSumAndEncryptBlock(byte[] in, int off)
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{
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byte l = checksum[BLOCK_LENGTH - 1];
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for (int i = 0; i < BLOCK_LENGTH; i++)
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{
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byte b = in[off + i];
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work[BLOCK_LENGTH + i] = b;
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// work[BLOCK_LENGTH*2+i] = (byte)((work[i] & 0xFF) ^ (b & 0xFF));
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work[BLOCK_LENGTH * 2 + i] = (byte) (work[i] ^ b);
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// l = (byte)((checksum[i] & 0xFF) ^ (PI[((b & 0xFF) ^ (l & 0xFF))] & 0xFF));
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l = (byte) (checksum[i] ^ PI[(b ^ l) & 0xFF]);
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checksum[i] = l;
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}
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byte t = 0;
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for (int i = 0; i < 18; i++)
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{
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for (int j = 0; j < 3 * BLOCK_LENGTH; j++)
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{
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// t = (byte)((work[j] & 0xFF) ^ (PI[t & 0xFF] & 0xFF));
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t = (byte) (work[j] ^ PI[t & 0xFF]);
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work[j] = t;
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}
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// t = (byte)((t + i) & 0xFF);
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t = (byte) (t + i);
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}
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}
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}
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