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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [javax/] [crypto/] [jce/] [params/] [BlockCipherParameters.java] - Blame information for rev 775

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1 769 jeremybenn
/* BlockCipherParameters.java --
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   Copyright (C) 2002, 2003, 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.jce.params;
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import gnu.java.security.Configuration;
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import gnu.javax.crypto.jce.spec.BlockCipherParameterSpec;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.security.AlgorithmParametersSpi;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.spec.InvalidParameterSpecException;
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import java.util.logging.Logger;
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import javax.crypto.spec.IvParameterSpec;
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/**
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 * An implementation of algorithm parameters for the GNU block ciphers. This
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 * encompasses the cipher's block size, its key size, and an optional
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 * initialization vector (IV).
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 */
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public class BlockCipherParameters
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    extends AlgorithmParametersSpi
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{
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  private static final Logger log = Logger.getLogger(BlockCipherParameters.class.getName());
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  /** The underlying block cipher specification. */
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  protected BlockCipherParameterSpec cipherSpec;
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  private static final String DEFAULT_FORMAT = "ASN.1";
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  /**
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   * Return these parameters encoded in ASN.1 (DER).
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   * <p>
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   * For GNU block ciphers we will define these parameters as
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   * <pre>
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   * BlockCipherParameters ::= SEQUENCE {
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   *    blockSize            INTEGER,
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   *    keySize              INTEGER,
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   *    initializationVector OCTET STRING OPTIONAL }
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   * </pre>
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   *
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   * @return The parameters, encoded an an ASN.1 DER sequence.
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   * @throws java.io.IOException If encoding these parameters fails.
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   */
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  protected byte[] engineGetEncoded() throws IOException
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  {
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    return engineGetEncoded(DEFAULT_FORMAT);
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  }
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  protected byte[] engineGetEncoded(String format) throws IOException
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  {
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    if (! format.equalsIgnoreCase(DEFAULT_FORMAT)
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        && ! format.equalsIgnoreCase("asn1"))
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      throw new IOException("unknown format \"" + format + "\"");
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    DERWriter writer = new DERWriter();
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    int cipherBlockSize = cipherSpec.getBlockSize();
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    int cipherKeySize = cipherSpec.getKeySize();
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    byte[] iv = cipherSpec.getIV();
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    return writer.joinarrays(
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        writer.writeBigInteger(BigInteger.valueOf(cipherBlockSize)),
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        writer.writeBigInteger(BigInteger.valueOf(cipherKeySize)),
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        (iv != null) ? writer.writeBigInteger(new BigInteger(iv))
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                     : new byte[0]);
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  }
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  protected void engineInit(AlgorithmParameterSpec spec)
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      throws InvalidParameterSpecException
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  {
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    if (spec instanceof BlockCipherParameterSpec)
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      cipherSpec = (BlockCipherParameterSpec) spec;
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    else
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      throw new InvalidParameterSpecException();
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  }
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  protected void engineInit(byte[] encoded, String format) throws IOException
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  {
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    if (! format.equalsIgnoreCase(DEFAULT_FORMAT)
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        && ! format.equalsIgnoreCase("ASN1"))
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      throw new IOException("invalid format: only accepts ASN.1");
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    engineInit(encoded);
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  }
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  protected void engineInit(byte[] encoded) throws IOException
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  {
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    DERReader reader = new DERReader(encoded);
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    int bs = reader.getBigInteger().intValue();
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    int ks = reader.getBigInteger().intValue();
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    byte[] iv = null;
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    if (reader.hasMorePrimitives())
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      iv = reader.getBigInteger().toByteArray();
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    cipherSpec = new BlockCipherParameterSpec(iv, bs, ks);
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    if (Configuration.DEBUG)
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      log.fine("cipherSpec: " + cipherSpec);
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  }
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  protected AlgorithmParameterSpec engineGetParameterSpec(Class c)
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      throws InvalidParameterSpecException
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  {
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    if (c.isInstance(cipherSpec))
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      return cipherSpec;
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    if (IvParameterSpec.class.isAssignableFrom(c))
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      {
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        IvParameterSpec result = new IvParameterSpec(cipherSpec.getIV());
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        return result;
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      }
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    throw new InvalidParameterSpecException();
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  }
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  protected String engineToString()
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  {
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    return cipherSpec.toString();
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  }
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}

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