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.util.asn1.pkcs;
019
020 import java.math.BigInteger;
021 import java.util.Enumeration;
022
023 import org.apache.geronimo.util.asn1.ASN1Encodable;
024 import org.apache.geronimo.util.asn1.ASN1EncodableVector;
025 import org.apache.geronimo.util.asn1.ASN1Sequence;
026 import org.apache.geronimo.util.asn1.DERInteger;
027 import org.apache.geronimo.util.asn1.DERObject;
028 import org.apache.geronimo.util.asn1.DERSequence;
029
030 public class DHParameter
031 extends ASN1Encodable
032 {
033 DERInteger p, g, l;
034
035 public DHParameter(
036 BigInteger p,
037 BigInteger g,
038 int l)
039 {
040 this.p = new DERInteger(p);
041 this.g = new DERInteger(g);
042
043 if (l != 0)
044 {
045 this.l = new DERInteger(l);
046 }
047 else
048 {
049 this.l = null;
050 }
051 }
052
053 public DHParameter(
054 ASN1Sequence seq)
055 {
056 Enumeration e = seq.getObjects();
057
058 p = (DERInteger)e.nextElement();
059 g = (DERInteger)e.nextElement();
060
061 if (e.hasMoreElements())
062 {
063 l = (DERInteger)e.nextElement();
064 }
065 else
066 {
067 l = null;
068 }
069 }
070
071 public BigInteger getP()
072 {
073 return p.getPositiveValue();
074 }
075
076 public BigInteger getG()
077 {
078 return g.getPositiveValue();
079 }
080
081 public BigInteger getL()
082 {
083 if (l == null)
084 {
085 return null;
086 }
087
088 return l.getPositiveValue();
089 }
090
091 public DERObject toASN1Object()
092 {
093 ASN1EncodableVector v = new ASN1EncodableVector();
094
095 v.add(p);
096 v.add(g);
097
098 if (this.getL() != null)
099 {
100 v.add(l);
101 }
102
103 return new DERSequence(v);
104 }
105 }