1 files changed, 150 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/provider/DSAParameters.java b/libjava/classpath/gnu/java/security/provider/DSAParameters.java
new file mode 100644
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+++ b/libjava/classpath/gnu/java/security/provider/DSAParameters.java
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+/* DSAParameters.java --- DSA Parameters Implementation
+   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.io.ASN1ParsingException;
+import gnu.java.security.der.DER;
+import gnu.java.security.der.DERReader;
+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.AlgorithmParametersSpi;
+import java.security.spec.AlgorithmParameterSpec;
+import java.security.spec.DSAParameterSpec;
+import java.security.spec.InvalidParameterSpecException;
+import java.util.ArrayList;
+
+/*
+	ASN.1 Encoding for DSA from rfc2459 
+
+        id-dsa ID ::= { iso(1) member-body(2) us(840) x9-57(10040)
+                  x9cm(4) 1 }
+
+        Dss-Parms  ::=  SEQUENCE  {
+            p             INTEGER,
+            q             INTEGER,
+            g             INTEGER  }
+
+*/
+public class DSAParameters extends AlgorithmParametersSpi
+{
+private BigInteger q; // the small prime
+private BigInteger p; // the big prime
+private BigInteger g;
+
+
+public void engineInit(AlgorithmParameterSpec paramSpec)
+                            throws InvalidParameterSpecException
+{
+	if( paramSpec instanceof DSAParameterSpec ) {
+		DSAParameterSpec dsaParamSpec = (DSAParameterSpec)paramSpec;
+		p = dsaParamSpec.getP();
+		q = dsaParamSpec.getQ();
+		g = dsaParamSpec.getG();
+	}
+	else
+		throw new InvalidParameterSpecException("Only accepts DSAParameterSpec");
+}
+
+public void engineInit(byte[] params)
+                            throws IOException
+{
+	DERReader in = new DERReader(params);
+	DERValue val = in.read();
+	if (val.getValue() != DER.CONSTRUCTED_VALUE)
+		throw new ASN1ParsingException("badly formed parameters");
+	try
+		{
+			p = (BigInteger) in.read().getValue();
+			q = (BigInteger) in.read().getValue();
+			g = (BigInteger) in.read().getValue();
+		}
+	catch (Exception x)
+		{
+			throw new ASN1ParsingException("badly formed parameters");
+		}
+}
+
+public void engineInit(byte[] params, String format)
+                            throws IOException
+{
+	if( !format.equals("ASN.1") )
+		throw new IOException("Invalid Format: Only accepts ASN.1");
+	engineInit( params );	
+}
+
+public AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec)
+                          throws InvalidParameterSpecException
+{
+	if( paramSpec.isAssignableFrom(DSAParameterSpec.class) )
+		return new DSAParameterSpec(p, q, g);
+	else
+		throw new InvalidParameterSpecException("Only accepts DSAParameterSpec");
+}
+
+public byte[] engineGetEncoded()
+                                    throws IOException
+{
+	ByteArrayOutputStream bout = new ByteArrayOutputStream();
+	ArrayList seq = new ArrayList(3);
+	seq.add(new DERValue(DER.INTEGER, p));
+	seq.add(new DERValue(DER.INTEGER, q));
+	seq.add(new DERValue(DER.INTEGER, g));
+	DERWriter.write(bout, new DERValue(DER.CONSTRUCTED | DER.SEQUENCE, seq));
+	return bout.toByteArray();
+}
+
+
+public byte[] engineGetEncoded(String format)
+                                    throws IOException
+{
+	if( !format.equals("ASN.1") )
+		throw new IOException("Invalid Format: Only accepts ASN.1");
+	return engineGetEncoded();
+}
+
+public String engineToString()
+{
+	return ("q: " + q + " p: " + p + " g: " + g);
+}
+
+}