| /* DSSKeyPairRawCodec.java -- |
| Copyright 2001, 2002, 2003, 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.java.security.key.dss; |
| |
| import gnu.java.security.Registry; |
| import gnu.java.security.key.IKeyPairCodec; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.math.BigInteger; |
| import java.security.PrivateKey; |
| import java.security.PublicKey; |
| |
| /** |
| * An object that implements the {@link IKeyPairCodec} operations for the |
| * <i>Raw</i> format to use with DSS keypairs. |
| */ |
| public class DSSKeyPairRawCodec |
| implements IKeyPairCodec |
| { |
| // implicit 0-arguments constructor |
| |
| public int getFormatID() |
| { |
| return RAW_FORMAT; |
| } |
| |
| /** |
| * Returns the encoded form of the designated DSS (Digital Signature Standard) |
| * public key according to the <i>Raw</i> format supported by this library. |
| * <p> |
| * The <i>Raw</i> format for a DSA public key, in this implementation, is a |
| * byte sequence consisting of the following: |
| * <ol> |
| * <li>4-byte magic consisting of the value of the literal |
| * {@link Registry#MAGIC_RAW_DSS_PUBLIC_KEY}, |
| * <li> |
| * <li>1-byte version consisting of the constant: 0x01,</li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>p</code> in internet order,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>p</code>, |
| * </li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>q</code>,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>q</code>, |
| * </li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>g</code>,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>g</code>, |
| * </li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>y</code>,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>y</code>, |
| * </li> |
| * </ol> |
| * |
| * @param key the key to encode. |
| * @return the <i>Raw</i> format encoding of the designated key. |
| * @throws IllegalArgumentException if the designated key is not a DSS |
| * (Digital Signature Standard) one. |
| * @see Registry#MAGIC_RAW_DSS_PUBLIC_KEY |
| */ |
| public byte[] encodePublicKey(PublicKey key) |
| { |
| if (! (key instanceof DSSPublicKey)) |
| throw new IllegalArgumentException("key"); |
| |
| DSSPublicKey dssKey = (DSSPublicKey) key; |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| // magic |
| baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[0]); |
| baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[1]); |
| baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[2]); |
| baos.write(Registry.MAGIC_RAW_DSS_PUBLIC_KEY[3]); |
| // version |
| baos.write(0x01); |
| // p |
| byte[] buffer = dssKey.getParams().getP().toByteArray(); |
| int length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| // q |
| buffer = dssKey.getParams().getQ().toByteArray(); |
| length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| // g |
| buffer = dssKey.getParams().getG().toByteArray(); |
| length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| // y |
| buffer = dssKey.getY().toByteArray(); |
| length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| return baos.toByteArray(); |
| } |
| |
| public PublicKey decodePublicKey(byte[] k) |
| { |
| // magic |
| if (k[0] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[0] |
| || k[1] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[1] |
| || k[2] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[2] |
| || k[3] != Registry.MAGIC_RAW_DSS_PUBLIC_KEY[3]) |
| throw new IllegalArgumentException("magic"); |
| |
| // version |
| if (k[4] != 0x01) |
| throw new IllegalArgumentException("version"); |
| |
| int i = 5; |
| int l; |
| byte[] buffer; |
| // p |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger p = new BigInteger(1, buffer); |
| // q |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger q = new BigInteger(1, buffer); |
| // g |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger g = new BigInteger(1, buffer); |
| // y |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger y = new BigInteger(1, buffer); |
| return new DSSPublicKey(p, q, g, y); |
| } |
| |
| /** |
| * Returns the encoded form of the designated DSS (Digital Signature Standard) |
| * private key according to the <i>Raw</i> format supported by this library. |
| * <p> |
| * The <i>Raw</i> format for a DSA private key, in this implementation, is a |
| * byte sequence consisting of the following: |
| * <ol> |
| * <li>4-byte magic consisting of the value of the literal |
| * {@link Registry#MAGIC_RAW_DSS_PRIVATE_KEY}, |
| * <li> |
| * <li>1-byte version consisting of the constant: 0x01,</li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>p</code> in internet order,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>p</code>, |
| * </li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>q</code>,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>q</code>, |
| * </li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>g</code>,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>g</code>, |
| * </li> |
| * <li>4-byte count of following bytes representing the DSA parameter |
| * <code>x</code>,</li> |
| * <li>n-bytes representation of a {@link BigInteger} obtained by invoking |
| * the <code>toByteArray()</code> method on the DSA parameter <code>x</code>, |
| * </li> |
| * </ol> |
| * |
| * @param key the key to encode. |
| * @return the <i>Raw</i> format encoding of the designated key. |
| * @throws IllegalArgumentException if the designated key is not a DSS |
| * (Digital Signature Standard) one. |
| */ |
| public byte[] encodePrivateKey(PrivateKey key) |
| { |
| if (! (key instanceof DSSPrivateKey)) |
| throw new IllegalArgumentException("key"); |
| |
| DSSPrivateKey dssKey = (DSSPrivateKey) key; |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| // magic |
| baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[0]); |
| baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[1]); |
| baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[2]); |
| baos.write(Registry.MAGIC_RAW_DSS_PRIVATE_KEY[3]); |
| // version |
| baos.write(0x01); |
| // p |
| byte[] buffer = dssKey.getParams().getP().toByteArray(); |
| int length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| // q |
| buffer = dssKey.getParams().getQ().toByteArray(); |
| length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| // g |
| buffer = dssKey.getParams().getG().toByteArray(); |
| length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| // x |
| buffer = dssKey.getX().toByteArray(); |
| length = buffer.length; |
| baos.write(length >>> 24); |
| baos.write((length >>> 16) & 0xFF); |
| baos.write((length >>> 8) & 0xFF); |
| baos.write(length & 0xFF); |
| baos.write(buffer, 0, length); |
| return baos.toByteArray(); |
| } |
| |
| public PrivateKey decodePrivateKey(byte[] k) |
| { |
| // magic |
| if (k[0] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[0] |
| || k[1] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[1] |
| || k[2] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[2] |
| || k[3] != Registry.MAGIC_RAW_DSS_PRIVATE_KEY[3]) |
| throw new IllegalArgumentException("magic"); |
| |
| // version |
| if (k[4] != 0x01) |
| throw new IllegalArgumentException("version"); |
| |
| int i = 5; |
| int l; |
| byte[] buffer; |
| // p |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger p = new BigInteger(1, buffer); |
| // q |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger q = new BigInteger(1, buffer); |
| // g |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger g = new BigInteger(1, buffer); |
| // x |
| l = k[i++] << 24 |
| | (k[i++] & 0xFF) << 16 |
| | (k[i++] & 0xFF) << 8 |
| | (k[i++] & 0xFF); |
| buffer = new byte[l]; |
| System.arraycopy(k, i, buffer, 0, l); |
| i += l; |
| BigInteger x = new BigInteger(1, buffer); |
| return new DSSPrivateKey(p, q, g, x); |
| } |
| } |