001 /**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements. See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package org.apache.geronimo.util.asn1.x509;
020
021 import java.math.BigInteger;
022 import java.util.Enumeration;
023
024 import org.apache.geronimo.util.asn1.ASN1Encodable;
025 import org.apache.geronimo.util.asn1.ASN1EncodableVector;
026 import org.apache.geronimo.util.asn1.ASN1Sequence;
027 import org.apache.geronimo.util.asn1.ASN1TaggedObject;
028 import org.apache.geronimo.util.asn1.DERInteger;
029 import org.apache.geronimo.util.asn1.DERObject;
030 import org.apache.geronimo.util.asn1.DERSequence;
031
032 public class DSAParameter
033 extends ASN1Encodable
034 {
035 DERInteger p, q, g;
036
037 public static DSAParameter getInstance(
038 ASN1TaggedObject obj,
039 boolean explicit)
040 {
041 return getInstance(ASN1Sequence.getInstance(obj, explicit));
042 }
043
044 public static DSAParameter getInstance(
045 Object obj)
046 {
047 if(obj == null || obj instanceof DSAParameter)
048 {
049 return (DSAParameter)obj;
050 }
051
052 if(obj instanceof ASN1Sequence)
053 {
054 return new DSAParameter((ASN1Sequence)obj);
055 }
056
057 throw new IllegalArgumentException("Invalid DSAParameter: " + obj.getClass().getName());
058 }
059
060 public DSAParameter(
061 BigInteger p,
062 BigInteger q,
063 BigInteger g)
064 {
065 this.p = new DERInteger(p);
066 this.q = new DERInteger(q);
067 this.g = new DERInteger(g);
068 }
069
070 public DSAParameter(
071 ASN1Sequence seq)
072 {
073 Enumeration e = seq.getObjects();
074
075 p = (DERInteger)e.nextElement();
076 q = (DERInteger)e.nextElement();
077 g = (DERInteger)e.nextElement();
078 }
079
080 public BigInteger getP()
081 {
082 return p.getPositiveValue();
083 }
084
085 public BigInteger getQ()
086 {
087 return q.getPositiveValue();
088 }
089
090 public BigInteger getG()
091 {
092 return g.getPositiveValue();
093 }
094
095 public DERObject toASN1Object()
096 {
097 ASN1EncodableVector v = new ASN1EncodableVector();
098
099 v.add(p);
100 v.add(q);
101 v.add(g);
102
103 return new DERSequence(v);
104 }
105 }