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+/* TLS1.java -- TLSv1 padding scheme.
+   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.pad;
+
+/**
+ * The padding scheme used by the Transport Layer Security protocol, version 1.
+ * This padding scheme is used in the block-ciphered struct, e.g.:
+ * <pre>
+ *  block-ciphered struct {
+ *    opaque content[TLSCompressed.length];
+ *    opaque MAC[CipherSpec.hash_size];
+ *    uint8 padding[GenericBlockCipher.padding_length];
+ *    uint8 padding_length;
+ *  } GenericBlockCipher;
+ * </pre>
+ * <p>
+ * Where <i>padding_length</i> is any multiple of <i>cipher_block_size</i> -
+ * ((<i>SSLCompressed.length</i> + <i>CipherSpec.hash_size</i>) %
+ * <i>cipher_block_size</i>) - 1 that is less than 255. Every byte of the
+ * padding must be equal to <i>padding_length</i>. That is, the end of the
+ * plaintext is <i>n</i> + 1 copies of the unsigned byte <i>n</i>.
+ */
+public class TLS1
+    extends BasePad
+{
+  public TLS1()
+  {
+    super("tls1");
+  }
+
+  public void setup()
+  {
+    if (blockSize <= 0 || blockSize > 255)
+      throw new IllegalArgumentException("invalid block size: " + blockSize);
+  }
+
+  public byte[] pad(final byte[] in, final int off, final int len)
+  {
+    int padlen = blockSize - (len % blockSize);
+    byte[] pad = new byte[padlen];
+    for (int i = 0; i < padlen; i++)
+      pad[i] = (byte)(padlen - 1);
+    return pad;
+  }
+
+  public int unpad(final byte[] in, final int off, final int len)
+      throws WrongPaddingException
+  {
+    int padlen = in[off + len - 1] & 0xFF;
+    for (int i = off + (len - padlen - 1); i < off + len - 1; i++)
+      if ((in[i] & 0xFF) != padlen)
+        throw new WrongPaddingException();
+    return padlen + 1;
+  }
+}