package com.lowagie.bc.asn1; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.Enumeration; public class DERSequence extends ASN1Sequence { /** * create an empty sequence */ public DERSequence() { } /** * create a sequence containing one object */ public DERSequence( DEREncodable obj) { this.addObject(obj); } /** * create a sequence containing a vector of objects. */ public DERSequence( DEREncodableVector v) { for (int i = 0; i != v.size(); i++) { this.addObject(v.get(i)); } } /* * A note on the implementation: *

* As DER requires the constructed, definite-length model to * be used for structured types, this varies slightly from the * ASN.1 descriptions given. Rather than just outputing SEQUENCE, * we also have to specify CONSTRUCTED, and the objects length. */ void encode( DEROutputStream out) throws IOException { ByteArrayOutputStream bOut = new ByteArrayOutputStream(); DEROutputStream dOut = new DEROutputStream(bOut); Enumeration e = this.getObjects(); while (e.hasMoreElements()) { Object obj = e.nextElement(); dOut.writeObject(obj); } dOut.close(); byte[] bytes = bOut.toByteArray(); out.writeEncoded(SEQUENCE | CONSTRUCTED, bytes); } }