Home | History | Annotate | Download | only in x9 
      1 package org.bouncycastle.asn1.x9;
      2 
      3 import org.bouncycastle.asn1.ASN1Choice;
      4 import org.bouncycastle.asn1.ASN1Encodable;
      5 import org.bouncycastle.asn1.ASN1Null;
      6 import org.bouncycastle.asn1.ASN1TaggedObject;
      7 import org.bouncycastle.asn1.DERObject;
      8 import org.bouncycastle.asn1.DERObjectIdentifier;
      9 
     10 public class X962Parameters
     11     extends ASN1Encodable
     12     implements ASN1Choice
     13 {
     14     private DERObject           params = null;
     15 
     16     public static X962Parameters getInstance(
     17         Object obj)
     18     {
     19         if (obj == null || obj instanceof X962Parameters)
     20         {
     21             return (X962Parameters)obj;
     22         }
     23 
     24         if (obj instanceof DERObject)
     25         {
     26             return new X962Parameters((DERObject)obj);
     27         }
     28 
     29         throw new IllegalArgumentException("unknown object in getInstance()");
     30     }
     31 
     32     public static X962Parameters getInstance(
     33         ASN1TaggedObject obj,
     34         boolean          explicit)
     35     {
     36         return getInstance(obj.getObject()); // must be explicitly tagged
     37     }
     38 
     39     public X962Parameters(
     40         X9ECParameters      ecParameters)
     41     {
     42         this.params = ecParameters.getDERObject();
     43     }
     44 
     45     public X962Parameters(
     46         DERObjectIdentifier  namedCurve)
     47     {
     48         this.params = namedCurve;
     49     }
     50 
     51     public X962Parameters(
     52         DERObject           obj)
     53     {
     54         this.params = obj;
     55     }
     56 
     57     public boolean isNamedCurve()
     58     {
     59         return (params instanceof DERObjectIdentifier);
     60     }
     61 
     62     public boolean isImplicitlyCA()
     63     {
     64         return (params instanceof ASN1Null);
     65     }
     66 
     67     public DERObject getParameters()
     68     {
     69         return params;
     70     }
     71 
     72     /**
     73      * Produce an object suitable for an ASN1OutputStream.
     74      * <pre>
     75      * Parameters ::= CHOICE {
     76      *    ecParameters ECParameters,
     77      *    namedCurve   CURVES.&id({CurveNames}),
     78      *    implicitlyCA NULL
     79      * }
     80      * </pre>
     81      */
     82     public DERObject toASN1Object()
     83     {
     84         return params;
     85     }
     86 }
     87