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1 files changed, 168 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/javax/crypto/mode/CTR.java b/libjava/classpath/gnu/javax/crypto/mode/CTR.java
new file mode 100644
index 000000000..56ea58c25
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/mode/CTR.java
@@ -0,0 +1,168 @@
+/* CTR.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.mode;
+
+import gnu.java.security.Registry;
+import gnu.java.security.util.Sequence;
+import gnu.javax.crypto.cipher.IBlockCipher;
+
+import java.util.Arrays;
+import java.util.Iterator;
+
+/**
+ * The implementation of the Counter Mode.
+ * <p>
+ * The algorithm steps are formally described as follows:
+ *
+ * <pre>
+ *     CTR Encryption: O[j] = E(K)(T[j]); for j = 1, 2...n;
+ *                     C[j] = P[j] &circ; O[j]; for j = 1, 2...n.
+ *     CTR Decryption: O[j] = E(K)(T[j]); for j = 1, 2...n;
+ *                     P[j] = C[j] &circ; O[j]; for j = 1, 2...n.
+ * </pre>
+ *
+ * <p>
+ * where <code>P</code> is the plaintext, <code>C</code> is the ciphertext,
+ * <code>E(K)</code> is the underlying block cipher encryption function
+ * parametrised with the session key <code>K</code>, and <code>T</code> is
+ * the <i>Counter</i>.
+ * <p>
+ * This implementation, uses a standard incrementing function with a step of 1,
+ * and an initial value similar to that described in the NIST document.
+ * <p>
+ * References:
+ * <ol>
+ * <li><a
+ * href="http://csrc.nist.gov/encryption/modes/Recommendation/Modes01.pdf">
+ * Recommendation for Block Cipher Modes of Operation Methods and Techniques</a>,
+ * Morris Dworkin.</li>
+ * </ol>
+ */
+public class CTR
+    extends BaseMode
+    implements Cloneable
+{
+  private int off;
+  private byte[] counter, enc;
+
+  /**
+   * Trivial package-private constructor for use by the Factory class.
+   *
+   * @param underlyingCipher the underlying cipher implementation.
+   * @param cipherBlockSize the underlying cipher block size to use.
+   */
+  CTR(IBlockCipher underlyingCipher, int cipherBlockSize)
+  {
+    super(Registry.CTR_MODE, underlyingCipher, cipherBlockSize);
+  }
+
+  /**
+   * Private constructor for cloning purposes.
+   *
+   * @param that the instance to clone.
+   */
+  private CTR(CTR that)
+  {
+    this((IBlockCipher) that.cipher.clone(), that.cipherBlockSize);
+  }
+
+  public Object clone()
+  {
+    return new CTR(this);
+  }
+
+  public void setup()
+  {
+    if (modeBlockSize > cipherBlockSize)
+      throw new IllegalArgumentException("mode size exceeds cipher block size");
+    off = 0;
+    counter = new byte[cipherBlockSize];
+    int i = cipherBlockSize - 1;
+    int j = iv.length - 1;
+    while (i >= 0 && j >= 0)
+      counter[i--] = iv[j--];
+    enc = new byte[cipherBlockSize];
+    cipher.encryptBlock(counter, 0, enc, 0);
+  }
+
+  public void teardown()
+  {
+    if (counter != null)
+      Arrays.fill(counter, (byte) 0);
+    if (enc != null)
+      Arrays.fill(enc, (byte) 0);
+  }
+
+  public void encryptBlock(byte[] in, int i, byte[] out, int o)
+  {
+    ctr(in, i, out, o);
+  }
+
+  public void decryptBlock(byte[] in, int i, byte[] out, int o)
+  {
+    ctr(in, i, out, o);
+  }
+
+  public Iterator blockSizes()
+  {
+    return new Sequence(1, cipherBlockSize).iterator();
+  }
+
+  private void ctr(byte[] in, int inOffset, byte[] out, int outOffset)
+  {
+    for (int i = 0; i < modeBlockSize; i++)
+      {
+        out[outOffset++] = (byte)(in[inOffset++] ^ enc[off++]);
+        if (off == cipherBlockSize)
+          {
+            int j;
+            for (j = cipherBlockSize - 1; j >= 0; j--)
+              {
+                counter[j]++;
+                if ((counter[j] & 0xFF) != 0)
+                  break;
+              }
+            if (j == 0)
+              counter[cipherBlockSize - 1]++;
+            off = 0;
+            cipher.encryptBlock(counter, 0, enc, 0);
+          }
+      }
+  }
+}