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+/* DSSSignatureRawCodec.java --
+ Copyright (C) 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.sig.dss;
+
+import gnu.java.security.Registry;
+import gnu.java.security.sig.ISignatureCodec;
+
+import java.io.ByteArrayOutputStream;
+import java.math.BigInteger;
+
+/**
+ * An object that implements the {@link ISignatureCodec} operations for the
+ * <i>Raw</i> format to use with DSS signatures.
+ */
+public class DSSSignatureRawCodec
+ implements ISignatureCodec
+{
+ public int getFormatID()
+ {
+ return RAW_FORMAT;
+ }
+
+ /**
+ * Returns the encoded form of the designated DSS (Digital Signature Standard)
+ * signature object according to the <i>Raw</i> format supported by this
+ * library.
+ * <p>
+ * The <i>Raw</i> format for a DSA signature, 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_SIGNATURE},</li>
+ * <li>1-byte version consisting of the constant: 0x01,</li>
+ * <li>4-byte count of following bytes representing the DSS parameter
+ * <code>r</code> in internet order,</li>
+ * <li>n-bytes representation of a {@link BigInteger} obtained by invoking
+ * the <code>toByteArray()</code> method on the DSS parameter <code>r</code>,
+ * </li>
+ * <li>4-byte count of following bytes representing the DSS parameter
+ * <code>s</code>,</li>
+ * <li>n-bytes representation of a {@link BigInteger} obtained by invoking
+ * the <code>toByteArray()</code> method on the DSS parameter <code>s</code>.
+ * </li>
+ * </ol>
+ *
+ * @param signature the signature to encode, consisting of the two DSS
+ * parameters <code>r</code> and <code>s</code> as a
+ * {@link BigInteger} array.
+ * @return the <i>Raw</i> format encoding of the designated signature.
+ * @exception IllegalArgumentException if the designated signature is not a
+ * DSS (Digital Signature Standard) one.
+ */
+ public byte[] encodeSignature(Object signature)
+ {
+ BigInteger r, s;
+ try
+ {
+ BigInteger[] sig = (BigInteger[]) signature;
+ r = sig[0];
+ s = sig[1];
+ }
+ catch (Exception x)
+ {
+ throw new IllegalArgumentException("signature");
+ }
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ // magic
+ baos.write(Registry.MAGIC_RAW_DSS_SIGNATURE[0]);
+ baos.write(Registry.MAGIC_RAW_DSS_SIGNATURE[1]);
+ baos.write(Registry.MAGIC_RAW_DSS_SIGNATURE[2]);
+ baos.write(Registry.MAGIC_RAW_DSS_SIGNATURE[3]);
+ // version
+ baos.write(0x01);
+ // r
+ byte[] buffer = r.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);
+ // s
+ buffer = s.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 Object decodeSignature(byte[] k)
+ {
+ // magic
+ if (k[0] != Registry.MAGIC_RAW_DSS_SIGNATURE[0]
+ || k[1] != Registry.MAGIC_RAW_DSS_SIGNATURE[1]
+ || k[2] != Registry.MAGIC_RAW_DSS_SIGNATURE[2]
+ || k[3] != Registry.MAGIC_RAW_DSS_SIGNATURE[3])
+ throw new IllegalArgumentException("magic");
+ // version
+ if (k[4] != 0x01)
+ throw new IllegalArgumentException("version");
+
+ int i = 5;
+ int l;
+ byte[] buffer;
+ // r
+ 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 r = new BigInteger(1, buffer);
+ // s
+ 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 s = new BigInteger(1, buffer);
+ return new BigInteger[] { r, s };
+ }
+}