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      1 package org.bouncycastle.asn1.x9;
      2 
      3 import java.util.Enumeration;
      4 
      5 import org.bouncycastle.asn1.ASN1Encodable;
      6 import org.bouncycastle.asn1.ASN1EncodableVector;
      7 import org.bouncycastle.asn1.ASN1Sequence;
      8 import org.bouncycastle.asn1.ASN1TaggedObject;
      9 import org.bouncycastle.asn1.DEREncodable;
     10 import org.bouncycastle.asn1.DERInteger;
     11 import org.bouncycastle.asn1.DERObject;
     12 import org.bouncycastle.asn1.DERSequence;
     13 
     14 public class DHDomainParameters
     15     extends ASN1Encodable
     16 {
     17     private DERInteger p, g, q, j;
     18     private DHValidationParms validationParms;
     19 
     20     public static DHDomainParameters getInstance(ASN1TaggedObject obj, boolean explicit)
     21     {
     22         return getInstance(ASN1Sequence.getInstance(obj, explicit));
     23     }
     24 
     25     public static DHDomainParameters getInstance(Object obj)
     26     {
     27         if (obj == null || obj instanceof DHDomainParameters)
     28         {
     29             return (DHDomainParameters)obj;
     30         }
     31 
     32         if (obj instanceof ASN1Sequence)
     33         {
     34             return new DHDomainParameters((ASN1Sequence)obj);
     35         }
     36 
     37         throw new IllegalArgumentException("Invalid DHDomainParameters: "
     38             + obj.getClass().getName());
     39     }
     40 
     41     public DHDomainParameters(DERInteger p, DERInteger g, DERInteger q, DERInteger j,
     42         DHValidationParms validationParms)
     43     {
     44         if (p == null)
     45         {
     46             throw new IllegalArgumentException("'p' cannot be null");
     47         }
     48         if (g == null)
     49         {
     50             throw new IllegalArgumentException("'g' cannot be null");
     51         }
     52         if (q == null)
     53         {
     54             throw new IllegalArgumentException("'q' cannot be null");
     55         }
     56 
     57         this.p = p;
     58         this.g = g;
     59         this.q = q;
     60         this.j = j;
     61         this.validationParms = validationParms;
     62     }
     63 
     64     private DHDomainParameters(ASN1Sequence seq)
     65     {
     66         if (seq.size() < 3 || seq.size() > 5)
     67         {
     68             throw new IllegalArgumentException("Bad sequence size: " + seq.size());
     69         }
     70 
     71         Enumeration e = seq.getObjects();
     72         this.p = DERInteger.getInstance(e.nextElement());
     73         this.g = DERInteger.getInstance(e.nextElement());
     74         this.q = DERInteger.getInstance(e.nextElement());
     75 
     76         DEREncodable next = getNext(e);
     77 
     78         if (next != null && next instanceof DERInteger)
     79         {
     80             this.j = DERInteger.getInstance(next);
     81             next = getNext(e);
     82         }
     83 
     84         if (next != null)
     85         {
     86             this.validationParms = DHValidationParms.getInstance(next.getDERObject());
     87         }
     88     }
     89 
     90     private static DEREncodable getNext(Enumeration e)
     91     {
     92         return e.hasMoreElements() ? (DEREncodable)e.nextElement() : null;
     93     }
     94 
     95     public DERInteger getP()
     96     {
     97         return this.p;
     98     }
     99 
    100     public DERInteger getG()
    101     {
    102         return this.g;
    103     }
    104 
    105     public DERInteger getQ()
    106     {
    107         return this.q;
    108     }
    109 
    110     public DERInteger getJ()
    111     {
    112         return this.j;
    113     }
    114 
    115     public DHValidationParms getValidationParms()
    116     {
    117         return this.validationParms;
    118     }
    119 
    120     public DERObject toASN1Object()
    121     {
    122         ASN1EncodableVector v = new ASN1EncodableVector();
    123         v.add(this.p);
    124         v.add(this.g);
    125         v.add(this.q);
    126 
    127         if (this.j != null)
    128         {
    129             v.add(this.j);
    130         }
    131 
    132         if (this.validationParms != null)
    133         {
    134             v.add(this.validationParms);
    135         }
    136 
    137         return new DERSequence(v);
    138     }
    139 }
    140