mirror of git://gcc.gnu.org/git/gcc.git
89 lines
3.2 KiB
Java
89 lines
3.2 KiB
Java
/* AESKeyWrapSpi.java -- Common AES Key Wrapping Algorithm methods
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is 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, or (at your option)
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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; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.jce.cipher;
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/**
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* Base abstract class to group common AES Key Wrapping Algorithm Adapter
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* methods.
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*/
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abstract class AESKeyWrapSpi
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extends KeyWrappingAlgorithmAdapter
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{
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protected AESKeyWrapSpi(String name, int keySize, String supportedMode)
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{
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super(name, 16, keySize, supportedMode);
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}
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/**
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* AES Key Wrapping algorithms operate on an 8-byte block; a block half the
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* size of the AES block itself.
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* <p>
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* In wrapping, the number of 8-byte output blocks is ALWAYS one block longer
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* than the input.
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*
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* @param inputLength the size of the plain text.
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* @return the size in bytes of <code>n + 1</code> 8-byte blocks where
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* <code>n</code> is the smallest number of 8-byte blocks that contain the
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* designated number of input bytes.
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*/
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protected int getOutputSizeForWrap(int inputLength)
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{
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int n = (inputLength + 7) / 8;
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return 8 * (n + 1);
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}
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/**
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* AES Key Wrapping algorithms operate on an 8-byte block; a block half the
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* size of the AES block itself.
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* <p>
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* In unwrapping, the number of 8-byte output blocks is ALWAYS one block
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* shorter than the input.
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*
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* @param inputLength the size of the cipher text.
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* @return the size in bytes of <code>n - 1</code> 8-byte blocks where
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* <code>n</code> is the smallest number of 8-byte blocks that contain the
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* designated number of input bytes.
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*/
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protected int getOutputSizeForUnwrap(int inputLength)
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{
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int n = (inputLength + 7) / 8;
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return 8 * (n - 1);
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}
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}
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