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jeremybenn |
/* DSSKeyPairRawCodec.java --
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Copyright 2001, 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.java.security.key.dss;
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import gnu.java.security.Registry;
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import gnu.java.security.key.IKeyPairCodec;
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import java.io.ByteArrayOutputStream;
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import java.math.BigInteger;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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/**
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* An object that implements the {@link IKeyPairCodec} operations for the
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* <i>Raw</i> format to use with DSS keypairs.
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*/
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public class DSSKeyPairRawCodec
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implements IKeyPairCodec
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{
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// implicit 0-arguments constructor
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public int getFormatID()
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{
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return RAW_FORMAT;
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}
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/**
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* Returns the encoded form of the designated DSS (Digital Signature Standard)
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* public key according to the <i>Raw</i> format supported by this library.
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* <p>
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* The <i>Raw</i> format for a DSA public key, in this implementation, is a
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* byte sequence consisting of the following:
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* <ol>
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* <li>4-byte magic consisting of the value of the literal
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* {@link Registry#MAGIC_RAW_DSS_PUBLIC_KEY},
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* <li>
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* <li>1-byte version consisting of the constant: 0x01,</li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>p</code> in internet order,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>p</code>,
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* </li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>q</code>,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>q</code>,
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* </li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>g</code>,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>g</code>,
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* </li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>y</code>,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>y</code>,
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* </li>
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* </ol>
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*
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* @param key the key to encode.
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* @return the <i>Raw</i> format encoding of the designated key.
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* @throws IllegalArgumentException if the designated key is not a DSS
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* (Digital Signature Standard) one.
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* @see Registry#MAGIC_RAW_DSS_PUBLIC_KEY
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*/
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public byte[] encodePublicKey(PublicKey key)
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{
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if (! (key instanceof DSSPublicKey))
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throw new IllegalArgumentException("key");
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DSSPublicKey dssKey = (DSSPublicKey) key;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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// magic
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baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[0]);
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baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[1]);
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baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[2]);
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baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[3]);
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// version
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baos.write(0x01);
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// p
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byte[] buffer = dssKey.getParams().getP().toByteArray();
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int length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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// q
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buffer = dssKey.getParams().getQ().toByteArray();
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length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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// g
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buffer = dssKey.getParams().getG().toByteArray();
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length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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// y
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buffer = dssKey.getY().toByteArray();
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length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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return baos.toByteArray();
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}
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public PublicKey decodePublicKey(byte[] k)
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{
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// magic
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if (k[0] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[0]
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|| k[1] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[1]
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|| k[2] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[2]
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|| k[3] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[3])
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throw new IllegalArgumentException("magic");
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// version
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if (k[4] != 0x01)
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throw new IllegalArgumentException("version");
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int i = 5;
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int l;
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byte[] buffer;
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// p
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l = k[i++] << 24
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| (k[i++] & 0xFF) << 16
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| (k[i++] & 0xFF) << 8
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| (k[i++] & 0xFF);
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buffer = new byte[l];
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System.arraycopy(k, i, buffer, 0, l);
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i += l;
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BigInteger p = new BigInteger(1, buffer);
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// q
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l = k[i++] << 24
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| (k[i++] & 0xFF) << 16
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| (k[i++] & 0xFF) << 8
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| (k[i++] & 0xFF);
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buffer = new byte[l];
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System.arraycopy(k, i, buffer, 0, l);
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i += l;
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BigInteger q = new BigInteger(1, buffer);
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// g
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l = k[i++] << 24
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| (k[i++] & 0xFF) << 16
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| (k[i++] & 0xFF) << 8
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| (k[i++] & 0xFF);
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buffer = new byte[l];
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System.arraycopy(k, i, buffer, 0, l);
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i += l;
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BigInteger g = new BigInteger(1, buffer);
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// y
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l = k[i++] << 24
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| (k[i++] & 0xFF) << 16
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| (k[i++] & 0xFF) << 8
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| (k[i++] & 0xFF);
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buffer = new byte[l];
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System.arraycopy(k, i, buffer, 0, l);
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i += l;
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BigInteger y = new BigInteger(1, buffer);
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return new DSSPublicKey(p, q, g, y);
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}
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/**
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* Returns the encoded form of the designated DSS (Digital Signature Standard)
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* private key according to the <i>Raw</i> format supported by this library.
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* <p>
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* The <i>Raw</i> format for a DSA private key, in this implementation, is a
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* byte sequence consisting of the following:
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* <ol>
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* <li>4-byte magic consisting of the value of the literal
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* {@link Registry#MAGIC_RAW_DSS_PRIVATE_KEY},
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* <li>
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* <li>1-byte version consisting of the constant: 0x01,</li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>p</code> in internet order,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>p</code>,
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* </li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>q</code>,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>q</code>,
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* </li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>g</code>,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>g</code>,
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* </li>
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* <li>4-byte count of following bytes representing the DSA parameter
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* <code>x</code>,</li>
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* <li>n-bytes representation of a {@link BigInteger} obtained by invoking
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* the <code>toByteArray()</code> method on the DSA parameter <code>x</code>,
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* </li>
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* </ol>
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*
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* @param key the key to encode.
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* @return the <i>Raw</i> format encoding of the designated key.
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* @throws IllegalArgumentException if the designated key is not a DSS
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* (Digital Signature Standard) one.
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*/
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public byte[] encodePrivateKey(PrivateKey key)
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{
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if (! (key instanceof DSSPrivateKey))
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throw new IllegalArgumentException("key");
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DSSPrivateKey dssKey = (DSSPrivateKey) key;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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// magic
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baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[0]);
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baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[1]);
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baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[2]);
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baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[3]);
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// version
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baos.write(0x01);
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// p
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byte[] buffer = dssKey.getParams().getP().toByteArray();
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int length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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// q
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buffer = dssKey.getParams().getQ().toByteArray();
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length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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// g
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buffer = dssKey.getParams().getG().toByteArray();
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length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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// x
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buffer = dssKey.getX().toByteArray();
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length = buffer.length;
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baos.write(length >>> 24);
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baos.write((length >>> 16) & 0xFF);
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baos.write((length >>> 8) & 0xFF);
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baos.write(length & 0xFF);
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baos.write(buffer, 0, length);
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return baos.toByteArray();
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}
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public PrivateKey decodePrivateKey(byte[] k)
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{
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// magic
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if (k[0] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[0]
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|| k[1] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[1]
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|| k[2] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[2]
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|| k[3] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[3])
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throw new IllegalArgumentException("magic");
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302 |
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// version
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if (k[4] != 0x01)
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throw new IllegalArgumentException("version");
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int i = 5;
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int l;
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byte[] buffer;
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// p
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l = k[i++] << 24
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311 |
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| (k[i++] & 0xFF) << 16
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312 |
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| (k[i++] & 0xFF) << 8
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313 |
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| (k[i++] & 0xFF);
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buffer = new byte[l];
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System.arraycopy(k, i, buffer, 0, l);
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i += l;
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BigInteger p = new BigInteger(1, buffer);
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// q
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l = k[i++] << 24
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320 |
|
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| (k[i++] & 0xFF) << 16
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321 |
|
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| (k[i++] & 0xFF) << 8
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322 |
|
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| (k[i++] & 0xFF);
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buffer = new byte[l];
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System.arraycopy(k, i, buffer, 0, l);
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i += l;
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BigInteger q = new BigInteger(1, buffer);
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// g
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l = k[i++] << 24
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329 |
|
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| (k[i++] & 0xFF) << 16
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330 |
|
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| (k[i++] & 0xFF) << 8
|
331 |
|
|
| (k[i++] & 0xFF);
|
332 |
|
|
buffer = new byte[l];
|
333 |
|
|
System.arraycopy(k, i, buffer, 0, l);
|
334 |
|
|
i += l;
|
335 |
|
|
BigInteger g = new BigInteger(1, buffer);
|
336 |
|
|
// x
|
337 |
|
|
l = k[i++] << 24
|
338 |
|
|
| (k[i++] & 0xFF) << 16
|
339 |
|
|
| (k[i++] & 0xFF) << 8
|
340 |
|
|
| (k[i++] & 0xFF);
|
341 |
|
|
buffer = new byte[l];
|
342 |
|
|
System.arraycopy(k, i, buffer, 0, l);
|
343 |
|
|
i += l;
|
344 |
|
|
BigInteger x = new BigInteger(1, buffer);
|
345 |
|
|
return new DSSPrivateKey(p, q, g, x);
|
346 |
|
|
}
|
347 |
|
|
}
|