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      1 package org.bouncycastle.asn1;
      2 
      3 import java.io.IOException;
      4 import java.util.Enumeration;
      5 
      6 /**
      7  * A DER encoded set object
      8  */
      9 public class DERSet
     10     extends ASN1Set
     11 {
     12     private int bodyLength = -1;
     13 
     14     /**
     15      * create an empty set
     16      */
     17     public DERSet()
     18     {
     19     }
     20 
     21     /**
     22      * @param obj - a single object that makes up the set.
     23      */
     24     public DERSet(
     25         ASN1Encodable obj)
     26     {
     27         super(obj);
     28     }
     29 
     30     /**
     31      * @param v - a vector of objects making up the set.
     32      */
     33     public DERSet(
     34         ASN1EncodableVector v)
     35     {
     36         super(v, true);
     37     }
     38 
     39     /**
     40      * create a set from an array of objects.
     41      */
     42     public DERSet(
     43         ASN1Encodable[]   a)
     44     {
     45         super(a, true);
     46     }
     47 
     48     DERSet(
     49         ASN1EncodableVector v,
     50         boolean                  doSort)
     51     {
     52         super(v, doSort);
     53     }
     54 
     55     private int getBodyLength()
     56         throws IOException
     57     {
     58         if (bodyLength < 0)
     59         {
     60             int length = 0;
     61 
     62             for (Enumeration e = this.getObjects(); e.hasMoreElements();)
     63             {
     64                 Object    obj = e.nextElement();
     65 
     66                 length += ((ASN1Encodable)obj).toASN1Primitive().toDERObject().encodedLength();
     67             }
     68 
     69             bodyLength = length;
     70         }
     71 
     72         return bodyLength;
     73     }
     74 
     75     int encodedLength()
     76         throws IOException
     77     {
     78         int length = getBodyLength();
     79 
     80         return 1 + StreamUtil.calculateBodyLength(length) + length;
     81     }
     82 
     83     /*
     84      * A note on the implementation:
     85      * <p>
     86      * As DER requires the constructed, definite-length model to
     87      * be used for structured types, this varies slightly from the
     88      * ASN.1 descriptions given. Rather than just outputting SET,
     89      * we also have to specify CONSTRUCTED, and the objects length.
     90      */
     91     void encode(
     92         ASN1OutputStream out)
     93         throws IOException
     94     {
     95         ASN1OutputStream        dOut = out.getDERSubStream();
     96         int                     length = getBodyLength();
     97 
     98         out.write(BERTags.SET | BERTags.CONSTRUCTED);
     99         out.writeLength(length);
    100 
    101         for (Enumeration e = this.getObjects(); e.hasMoreElements();)
    102         {
    103             Object    obj = e.nextElement();
    104 
    105             dOut.writeObject((ASN1Encodable)obj);
    106         }
    107     }
    108 }
    109