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.pkcs;
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.DERInteger;
028 import org.apache.geronimo.util.asn1.DERObject;
029 import org.apache.geronimo.util.asn1.DERSequence;
030
031 public class DHParameter
032 extends ASN1Encodable
033 {
034 DERInteger p, g, l;
035
036 public DHParameter(
037 BigInteger p,
038 BigInteger g,
039 int l)
040 {
041 this.p = new DERInteger(p);
042 this.g = new DERInteger(g);
043
044 if (l != 0)
045 {
046 this.l = new DERInteger(l);
047 }
048 else
049 {
050 this.l = null;
051 }
052 }
053
054 public DHParameter(
055 ASN1Sequence seq)
056 {
057 Enumeration e = seq.getObjects();
058
059 p = (DERInteger)e.nextElement();
060 g = (DERInteger)e.nextElement();
061
062 if (e.hasMoreElements())
063 {
064 l = (DERInteger)e.nextElement();
065 }
066 else
067 {
068 l = null;
069 }
070 }
071
072 public BigInteger getP()
073 {
074 return p.getPositiveValue();
075 }
076
077 public BigInteger getG()
078 {
079 return g.getPositiveValue();
080 }
081
082 public BigInteger getL()
083 {
084 if (l == null)
085 {
086 return null;
087 }
088
089 return l.getPositiveValue();
090 }
091
092 public DERObject toASN1Object()
093 {
094 ASN1EncodableVector v = new ASN1EncodableVector();
095
096 v.add(p);
097 v.add(g);
098
099 if (this.getL() != null)
100 {
101 v.add(l);
102 }
103
104 return new DERSequence(v);
105 }
106 }