Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* GnuDSAPublicKey.java --- Gnu DSA Public Key
+   Copyright (C) 1999,2003,2004 Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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.provider;
+
+import gnu.java.security.OID;
+import gnu.java.security.der.BitString;
+import gnu.java.security.der.DER;
+import gnu.java.security.der.DERValue;
+import gnu.java.security.der.DERWriter;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.math.BigInteger;
+import java.security.interfaces.DSAParams;
+import java.security.interfaces.DSAPublicKey;
+import java.security.spec.DSAParameterSpec;
+import java.util.ArrayList;
+
+public class GnuDSAPublicKey implements DSAPublicKey
+{
+  private byte[] encodedKey;
+  BigInteger y;
+  BigInteger p;
+  BigInteger q;
+  BigInteger g;
+
+  public GnuDSAPublicKey(BigInteger y, BigInteger p, BigInteger q, BigInteger g )
+  {
+    this.y = y;
+    this.p = p;
+    this.q = q;
+    this.g = g;
+  }
+
+  public String getAlgorithm()
+  {
+    return "DSA";
+  }
+
+  public String getFormat()
+  {
+    return "X.509";
+  }
+
+  /**
+   * The encoded form of DSA public keys is:
+   *
+   * <blockquote><pre>
+   * SubjectPublicKeyInfo ::= SEQUENCE {
+   *   algorithm AlgorithmIdentifier,
+   *   subjectPublicKey BIT STRING }
+   * </pre></blockquote>
+   */
+  public byte[] getEncoded()
+  {
+    if (encodedKey != null)
+      return (byte[]) encodedKey.clone();
+    try
+      {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        ArrayList spki = new ArrayList(2);
+        ArrayList alg = new ArrayList(2);
+        alg.add(new DERValue(DER.OBJECT_IDENTIFIER,
+                new OID("1.2.840.113549.1.1.1")));
+        ArrayList params = new ArrayList(3);
+        params.add(new DERValue(DER.INTEGER, p));
+        params.add(new DERValue(DER.INTEGER, q));
+        params.add(new DERValue(DER.INTEGER, g));
+        alg.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, params));
+        spki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg));
+        spki.add(new DERValue(DER.BIT_STRING, new BitString(y.toByteArray())));
+        DERWriter.write(out, new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, spki));
+        return (byte[]) (encodedKey = out.toByteArray()).clone();
+      }
+    catch (IOException ioe)
+      {
+        return null;
+      }
+  }
+
+  public DSAParams getParams()
+  {
+    if (p == null || q == null || g == null)
+      return null;
+    return (DSAParams)(new DSAParameterSpec(p,q,g));
+  }
+
+  public BigInteger getY()
+  {
+    return y;
+  }
+
+  public String toString()
+  {
+    return
+      "GnuDSAPublicKey: y=" + (y != null ? y.toString(16) : "(null)") +
+      " p=" + (p != null ? p.toString(16) : "(null)") +
+      " q=" + (q != null ? q.toString(16) : "(null)") +
+      " g=" + (g != null ? g.toString(16) : "(null)");
+  }
+}