mirror of git://gcc.gnu.org/git/gcc.git
92 lines
3.3 KiB
Java
92 lines
3.3 KiB
Java
/* TLS1.java -- TLSv1 padding scheme.
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Copyright (C) 2004, 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.javax.crypto.pad;
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/**
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* The padding scheme used by the Transport Layer Security protocol, version 1.
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* This padding scheme is used in the block-ciphered struct, e.g.:
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* <pre>
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* block-ciphered struct {
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* opaque content[TLSCompressed.length];
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* opaque MAC[CipherSpec.hash_size];
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* uint8 padding[GenericBlockCipher.padding_length];
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* uint8 padding_length;
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* } GenericBlockCipher;
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* </pre>
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* <p>
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* Where <i>padding_length</i> is any multiple of <i>cipher_block_size</i> -
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* ((<i>SSLCompressed.length</i> + <i>CipherSpec.hash_size</i>) %
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* <i>cipher_block_size</i>) - 1 that is less than 255. Every byte of the
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* padding must be equal to <i>padding_length</i>. That is, the end of the
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* plaintext is <i>n</i> + 1 copies of the unsigned byte <i>n</i>.
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*/
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public class TLS1
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extends BasePad
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{
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public TLS1()
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{
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super("tls1");
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}
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public void setup()
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{
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if (blockSize <= 0 || blockSize > 255)
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throw new IllegalArgumentException("invalid block size: " + blockSize);
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}
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public byte[] pad(final byte[] in, final int off, final int len)
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{
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int padlen = blockSize - (len % blockSize);
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byte[] pad = new byte[padlen];
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for (int i = 0; i < padlen; i++)
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pad[i] = (byte)(padlen - 1);
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return pad;
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}
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public int unpad(final byte[] in, final int off, final int len)
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throws WrongPaddingException
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{
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int padlen = in[off + len - 1] & 0xFF;
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for (int i = off + (len - padlen - 1); i < off + len - 1; i++)
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if ((in[i] & 0xFF) != padlen)
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throw new WrongPaddingException();
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return padlen + 1;
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}
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}
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