llvm-gcc-4.2/libjava/classpath/gnu/javax/crypto/mac/OMAC.java - llvm-archive - Git at Google

 /* OMAC.java --
    Copyright (C) 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.mac;

 import gnu.java.security.Configuration;
 import gnu.java.security.Registry;
 import gnu.java.security.util.Util;
 import gnu.javax.crypto.cipher.CipherFactory;
 import gnu.javax.crypto.cipher.IBlockCipher;
 import gnu.javax.crypto.mode.IMode;

 import java.security.InvalidKeyException;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.logging.Logger;

 /**
  * The One-Key CBC MAC, OMAC. This message authentication code is based on a
  * block cipher in CBC mode.
  * <p>
  * References:
  * <ol>
  * <li>Tetsu Iwata and Kaoru Kurosawa, <i><a
  * href="http://crypt.cis.ibaraki.ac.jp/omac/docs/omac.pdf">OMAC: One-Key CBC
  * MAC</a></i>.</li>
  * </ol>
  */
 public class OMAC
     implements IMac
 {
   private static final Logger log = Logger.getLogger(OMAC.class.getName());
   private static final byte C1 = (byte) 0x87;
   private static final byte C2 = 0x1b;
   // Test key for OMAC-AES-128
   private static final byte[] KEY0 =
       Util.toBytesFromString("2b7e151628aed2a6abf7158809cf4f3c");
   // Test MAC for zero-length input.
   private static final byte[] DIGEST0 =
       Util.toBytesFromString("bb1d6929e95937287fa37d129b756746");
   private static Boolean valid;
   private final IBlockCipher cipher;
   private final String name;
   private IMode mode;
   private int blockSize;
   private int outputSize;
   private byte[] Lu, Lu2;
   private byte[] M;
   private byte[] Y;
   private boolean init;
   private int index;

   public OMAC(IBlockCipher cipher)
   {
     this.cipher = cipher;
     this.name = "OMAC-" + cipher.name();
   }

   public Object clone()
   {
     return new OMAC(cipher);
   }

   public String name()
   {
     return name;
   }

   public int macSize()
   {
     return outputSize;
   }

   public void init(Map attrib) throws InvalidKeyException
   {
     HashMap attrib2 = new HashMap();
     attrib2.put(IBlockCipher.KEY_MATERIAL, attrib.get(MAC_KEY_MATERIAL));
     cipher.reset();
     cipher.init(attrib2);
     blockSize = cipher.currentBlockSize();
     Integer os = (Integer) attrib.get(TRUNCATED_SIZE);
     if (os != null)
       {
         outputSize = os.intValue();
         if (outputSize < 0 || outputSize > blockSize)
           throw new IllegalArgumentException("truncated size out of range");
       }
     else
       outputSize = blockSize;

     byte[] L = new byte[blockSize];
     cipher.encryptBlock(L, 0, L, 0);
     if (Configuration.DEBUG)
       log.fine("L = " + Util.toString(L).toLowerCase());
     if (Lu != null)
       {
         Arrays.fill(Lu, (byte) 0);
         if (Lu.length != blockSize)
           Lu = new byte[blockSize];
       }
     else
       Lu = new byte[blockSize];
     if (Lu2 != null)
       {
         Arrays.fill(Lu2, (byte) 0);
         if (Lu2.length != blockSize)
           Lu2 = new byte[blockSize];
       }
     else
       Lu2 = new byte[blockSize];

     boolean msb = (L[0] & 0x80) != 0;
     for (int i = 0; i < blockSize; i++)
       {
         Lu[i] = (byte)(L[i] << 1 & 0xFF);
         if (i + 1 < blockSize)
           Lu[i] |= (byte)((L[i + 1] & 0x80) >> 7);
       }
     if (msb)
       {
         if (blockSize == 16)
           Lu[Lu.length - 1] ^= C1;
         else if (blockSize == 8)
           Lu[Lu.length - 1] ^= C2;
         else
           throw new IllegalArgumentException("unsupported cipher block size: "
                                              + blockSize);
       }
     if (Configuration.DEBUG)
       log.fine("Lu = " + Util.toString(Lu).toLowerCase());
     msb = (Lu[0] & 0x80) != 0;
     for (int i = 0; i < blockSize; i++)
       {
         Lu2[i] = (byte)(Lu[i] << 1 & 0xFF);
         if (i + 1 < blockSize)
           Lu2[i] |= (byte)((Lu[i + 1] & 0x80) >> 7);
       }
     if (msb)
       {
         if (blockSize == 16)
           Lu2[Lu2.length - 1] ^= C1;
         else
           Lu2[Lu2.length - 1] ^= C2;
       }
     if (Configuration.DEBUG)
       log.fine("Lu2 = " + Util.toString(Lu2).toLowerCase());
     if (M != null)
       {
         Arrays.fill(M, (byte) 0);
         if (M.length != blockSize)
           M = new byte[blockSize];
       }
     else
       M = new byte[blockSize];
     if (Y != null)
       {
         Arrays.fill(Y, (byte) 0);
         if (Y.length != blockSize)
           Y = new byte[blockSize];
       }
     else
       Y = new byte[blockSize];

     index = 0;
     init = true;
   }

   public void update(byte b)
   {
     if (! init)
       throw new IllegalStateException("not initialized");
     if (index == M.length)
       {
         process();
         index = 0;
       }
     M[index++] = b;
   }

   public void update(byte[] buf, int off, int len)
   {
     if (! init)
       throw new IllegalStateException("not initialized");
     if (off < 0 || len < 0 || off + len > buf.length)
       throw new IndexOutOfBoundsException("size=" + buf.length + "; off=" + off
                                           + "; len=" + len);
     for (int i = 0; i < len;)
       {
         if (index == blockSize)
           {
             process();
             index = 0;
           }
         int count = Math.min(blockSize - index, len - i);
         System.arraycopy(buf, off + i, M, index, count);
         index += count;
         i += count;
       }
   }

   public byte[] digest()
   {
     byte[] b = new byte[outputSize];
     digest(b, 0);
     return b;
   }

   public void digest(byte[] out, int off)
   {
     if (! init)
       throw new IllegalStateException("not initialized");
     if (off < 0 || off + outputSize > out.length)
       throw new IndexOutOfBoundsException("size=" + out.length + "; off=" + off
                                           + "; len=" + outputSize);
     byte[] T = new byte[blockSize];
     byte[] L = Lu;
     if (index < blockSize)
       {
         M[index++] = (byte) 0x80;
         while (index < blockSize)
           M[index++] = 0;
         L = Lu2;
       }
     for (int i = 0; i < blockSize; i++)
       T[i] = (byte)(M[i] ^ Y[i] ^ L[i]);
     cipher.encryptBlock(T, 0, T, 0);
     System.arraycopy(T, 0, out, off, outputSize);
     reset();
   }

   public void reset()
   {
     index = 0;
     if (Y != null)
       Arrays.fill(Y, (byte) 0);
     if (M != null)
       Arrays.fill(M, (byte) 0);
   }

   public boolean selfTest()
   {
     OMAC mac = new OMAC(CipherFactory.getInstance(Registry.AES_CIPHER));
     mac.reset();
     Map attr = new HashMap();
     attr.put(MAC_KEY_MATERIAL, KEY0);
     byte[] digest = null;
     try
       {
         mac.init(attr);
         digest = mac.digest();
       }
     catch (Exception x)
       {
         return false;
       }
     if (digest == null)
       return false;
     return Arrays.equals(DIGEST0, digest);
   }

   private void process()
   {
     for (int i = 0; i < blockSize; i++)
       M[i] = (byte)(M[i] ^ Y[i]);
     cipher.encryptBlock(M, 0, Y, 0);
   }
 }
	/* OMAC.java --
	Copyright (C) 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.mac;

	import gnu.java.security.Configuration;
	import gnu.java.security.Registry;
	import gnu.java.security.util.Util;
	import gnu.javax.crypto.cipher.CipherFactory;
	import gnu.javax.crypto.cipher.IBlockCipher;
	import gnu.javax.crypto.mode.IMode;

	import java.security.InvalidKeyException;
	import java.util.Arrays;
	import java.util.HashMap;
	import java.util.Map;
	import java.util.logging.Logger;

	/**
	* The One-Key CBC MAC, OMAC. This message authentication code is based on a
	* block cipher in CBC mode.
	* <p>
	* References:
	* <ol>
	* <li>Tetsu Iwata and Kaoru Kurosawa, <i><a
	* href="http://crypt.cis.ibaraki.ac.jp/omac/docs/omac.pdf">OMAC: One-Key CBC
	* MAC</a></i>.</li>
	* </ol>
	*/
	public class OMAC
	implements IMac
	{
	private static final Logger log = Logger.getLogger(OMAC.class.getName());
	private static final byte C1 = (byte) 0x87;
	private static final byte C2 = 0x1b;
	// Test key for OMAC-AES-128
	private static final byte[] KEY0 =
	Util.toBytesFromString("2b7e151628aed2a6abf7158809cf4f3c");
	// Test MAC for zero-length input.
	private static final byte[] DIGEST0 =
	Util.toBytesFromString("bb1d6929e95937287fa37d129b756746");
	private static Boolean valid;
	private final IBlockCipher cipher;
	private final String name;
	private IMode mode;
	private int blockSize;
	private int outputSize;
	private byte[] Lu, Lu2;
	private byte[] M;
	private byte[] Y;
	private boolean init;
	private int index;

	public OMAC(IBlockCipher cipher)
	{
	this.cipher = cipher;
	this.name = "OMAC-" + cipher.name();
	}

	public Object clone()
	{
	return new OMAC(cipher);
	}

	public String name()
	{
	return name;
	}

	public int macSize()
	{
	return outputSize;
	}

	public void init(Map attrib) throws InvalidKeyException
	{
	HashMap attrib2 = new HashMap();
	attrib2.put(IBlockCipher.KEY_MATERIAL, attrib.get(MAC_KEY_MATERIAL));
	cipher.reset();
	cipher.init(attrib2);
	blockSize = cipher.currentBlockSize();
	Integer os = (Integer) attrib.get(TRUNCATED_SIZE);
	if (os != null)
	{
	outputSize = os.intValue();
	if (outputSize < 0 \|\| outputSize > blockSize)
	throw new IllegalArgumentException("truncated size out of range");
	}
	else
	outputSize = blockSize;

	byte[] L = new byte[blockSize];
	cipher.encryptBlock(L, 0, L, 0);
	if (Configuration.DEBUG)
	log.fine("L = " + Util.toString(L).toLowerCase());
	if (Lu != null)
	{
	Arrays.fill(Lu, (byte) 0);
	if (Lu.length != blockSize)
	Lu = new byte[blockSize];
	}
	else
	Lu = new byte[blockSize];
	if (Lu2 != null)
	{
	Arrays.fill(Lu2, (byte) 0);
	if (Lu2.length != blockSize)
	Lu2 = new byte[blockSize];
	}
	else
	Lu2 = new byte[blockSize];

	boolean msb = (L[0] & 0x80) != 0;
	for (int i = 0; i < blockSize; i++)
	{
	Lu[i] = (byte)(L[i] << 1 & 0xFF);
	if (i + 1 < blockSize)
	Lu[i] \|= (byte)((L[i + 1] & 0x80) >> 7);
	}
	if (msb)
	{
	if (blockSize == 16)
	Lu[Lu.length - 1] ^= C1;
	else if (blockSize == 8)
	Lu[Lu.length - 1] ^= C2;
	else
	throw new IllegalArgumentException("unsupported cipher block size: "
	+ blockSize);
	}
	if (Configuration.DEBUG)
	log.fine("Lu = " + Util.toString(Lu).toLowerCase());
	msb = (Lu[0] & 0x80) != 0;
	for (int i = 0; i < blockSize; i++)
	{
	Lu2[i] = (byte)(Lu[i] << 1 & 0xFF);
	if (i + 1 < blockSize)
	Lu2[i] \|= (byte)((Lu[i + 1] & 0x80) >> 7);
	}
	if (msb)
	{
	if (blockSize == 16)
	Lu2[Lu2.length - 1] ^= C1;
	else
	Lu2[Lu2.length - 1] ^= C2;
	}
	if (Configuration.DEBUG)
	log.fine("Lu2 = " + Util.toString(Lu2).toLowerCase());
	if (M != null)
	{
	Arrays.fill(M, (byte) 0);
	if (M.length != blockSize)
	M = new byte[blockSize];
	}
	else
	M = new byte[blockSize];
	if (Y != null)
	{
	Arrays.fill(Y, (byte) 0);
	if (Y.length != blockSize)
	Y = new byte[blockSize];
	}
	else
	Y = new byte[blockSize];

	index = 0;
	init = true;
	}

	public void update(byte b)
	{
	if (! init)
	throw new IllegalStateException("not initialized");
	if (index == M.length)
	{
	process();
	index = 0;
	}
	M[index++] = b;
	}

	public void update(byte[] buf, int off, int len)
	{
	if (! init)
	throw new IllegalStateException("not initialized");
	if (off < 0 \|\| len < 0 \|\| off + len > buf.length)
	throw new IndexOutOfBoundsException("size=" + buf.length + "; off=" + off
	+ "; len=" + len);
	for (int i = 0; i < len;)
	{
	if (index == blockSize)
	{
	process();
	index = 0;
	}
	int count = Math.min(blockSize - index, len - i);
	System.arraycopy(buf, off + i, M, index, count);
	index += count;
	i += count;
	}
	}

	public byte[] digest()
	{
	byte[] b = new byte[outputSize];
	digest(b, 0);
	return b;
	}

	public void digest(byte[] out, int off)
	{
	if (! init)
	throw new IllegalStateException("not initialized");
	if (off < 0 \|\| off + outputSize > out.length)
	throw new IndexOutOfBoundsException("size=" + out.length + "; off=" + off
	+ "; len=" + outputSize);
	byte[] T = new byte[blockSize];
	byte[] L = Lu;
	if (index < blockSize)
	{
	M[index++] = (byte) 0x80;
	while (index < blockSize)
	M[index++] = 0;
	L = Lu2;
	}
	for (int i = 0; i < blockSize; i++)
	T[i] = (byte)(M[i] ^ Y[i] ^ L[i]);
	cipher.encryptBlock(T, 0, T, 0);
	System.arraycopy(T, 0, out, off, outputSize);
	reset();
	}

	public void reset()
	{
	index = 0;
	if (Y != null)
	Arrays.fill(Y, (byte) 0);
	if (M != null)
	Arrays.fill(M, (byte) 0);
	}

	public boolean selfTest()
	{
	OMAC mac = new OMAC(CipherFactory.getInstance(Registry.AES_CIPHER));
	mac.reset();
	Map attr = new HashMap();
	attr.put(MAC_KEY_MATERIAL, KEY0);
	byte[] digest = null;
	try
	{
	mac.init(attr);
	digest = mac.digest();
	}
	catch (Exception x)
	{
	return false;
	}
	if (digest == null)
	return false;
	return Arrays.equals(DIGEST0, digest);
	}

	private void process()
	{
	for (int i = 0; i < blockSize; i++)
	M[i] = (byte)(M[i] ^ Y[i]);
	cipher.encryptBlock(M, 0, Y, 0);
	}
	}