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From-SVN: r102074

1 files changed, 127 insertions, 0 deletions

diff --git a/libjava/classpath/javax/crypto/NullCipherImpl.java b/libjava/classpath/javax/crypto/NullCipherImpl.java
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+/* NullCipherImpl.java -- implementation of NullCipher.
+   Copyright (C) 2004  Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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 javax.crypto;
+
+import java.security.AlgorithmParameters;
+import java.security.Key;
+import java.security.SecureRandom;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * Implementation of the identity cipher.
+ */
+final class NullCipherImpl extends CipherSpi
+{
+
+  // Constructor.
+  // -------------------------------------------------------------------------
+
+  NullCipherImpl()
+  {
+    super();
+  }
+
+  // Instance methods.
+  // -------------------------------------------------------------------------
+
+  protected void engineSetMode(String mode) { }
+  protected void engineSetPadding(String padding) { }
+
+  protected int engineGetBlockSize()
+  {
+    return 1;
+  }
+
+  protected int engineGetOutputSize(int inputLen)
+  {
+    return inputLen;
+  }
+
+  protected byte[] engineGetIV()
+  {
+    return null;
+  }
+
+  protected AlgorithmParameters engineGetParameters()
+  {
+    return null;
+  }
+
+  protected void engineInit(int mode, Key key, SecureRandom random) { }
+  protected void engineInit(int mode, Key key, AlgorithmParameterSpec spec, SecureRandom random) { }
+  protected void engineInit(int mode, Key key, AlgorithmParameters params, SecureRandom random) { }
+
+  protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen)
+  {
+    if (input == null)
+      return new byte[0];
+    if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length)
+      throw new ArrayIndexOutOfBoundsException();
+    byte[] output = new byte[inputLen];
+    System.arraycopy(input, inputOffset, output, 0, inputLen);
+    return output;
+  }
+
+  protected int engineUpdate(byte[] input, int inputOffset, int inputLen,
+                             byte[] output, int outputOffset)
+    throws ShortBufferException
+  {
+    if (input == null)
+      return 0;
+    if (inputOffset < 0 || inputLen < 0 || inputOffset + inputLen > input.length
+        || outputOffset < 0)
+      throw new ArrayIndexOutOfBoundsException();
+    if (output.length - outputOffset < inputLen)
+      throw new ShortBufferException();
+    System.arraycopy(input, inputOffset, output, outputOffset, inputLen);
+    return inputLen;
+  }
+
+  protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen)
+  {
+    return engineUpdate(input, inputOffset, inputLen);
+  }
+
+  protected int engineDoFinal(byte[] input, int inputOffset, int inputLen,
+                              byte[] output, int outputOffset)
+    throws ShortBufferException
+  {
+    return engineUpdate(input, inputOffset, inputLen, output, outputOffset);
+  }
+}