001    /**
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    
018    package org.apache.geronimo.crypto.asn1.x509;
019    
020    import java.math.BigInteger;
021    import java.util.Enumeration;
022    
023    import org.apache.geronimo.crypto.asn1.ASN1Encodable;
024    import org.apache.geronimo.crypto.asn1.ASN1EncodableVector;
025    import org.apache.geronimo.crypto.asn1.ASN1Sequence;
026    import org.apache.geronimo.crypto.asn1.ASN1TaggedObject;
027    import org.apache.geronimo.crypto.asn1.DERInteger;
028    import org.apache.geronimo.crypto.asn1.DERObject;
029    import org.apache.geronimo.crypto.asn1.DERSequence;
030    
031    public class DSAParameter
032        extends ASN1Encodable
033    {
034        DERInteger      p, q, g;
035    
036        public static DSAParameter getInstance(
037            ASN1TaggedObject obj,
038            boolean          explicit)
039        {
040            return getInstance(ASN1Sequence.getInstance(obj, explicit));
041        }
042    
043        public static DSAParameter getInstance(
044            Object obj)
045        {
046            if(obj == null || obj instanceof DSAParameter)
047            {
048                return (DSAParameter)obj;
049            }
050    
051            if(obj instanceof ASN1Sequence)
052            {
053                return new DSAParameter((ASN1Sequence)obj);
054            }
055    
056            throw new IllegalArgumentException("Invalid DSAParameter: " + obj.getClass().getName());
057        }
058    
059        public DSAParameter(
060            BigInteger  p,
061            BigInteger  q,
062            BigInteger  g)
063        {
064            this.p = new DERInteger(p);
065            this.q = new DERInteger(q);
066            this.g = new DERInteger(g);
067        }
068    
069        public DSAParameter(
070            ASN1Sequence  seq)
071        {
072            Enumeration     e = seq.getObjects();
073    
074            p = (DERInteger)e.nextElement();
075            q = (DERInteger)e.nextElement();
076            g = (DERInteger)e.nextElement();
077        }
078    
079        public BigInteger getP()
080        {
081            return p.getPositiveValue();
082        }
083    
084        public BigInteger getQ()
085        {
086            return q.getPositiveValue();
087        }
088    
089        public BigInteger getG()
090        {
091            return g.getPositiveValue();
092        }
093    
094        public DERObject toASN1Object()
095        {
096            ASN1EncodableVector  v = new ASN1EncodableVector();
097    
098            v.add(p);
099            v.add(q);
100            v.add(g);
101    
102            return new DERSequence(v);
103        }
104    }