package org.bouncycastle.asn1; import java.io.IOException; import java.util.Enumeration; /** * A DER encoded set object */ public class DERSet extends ASN1Set { private int bodyLength = -1; /** * create an empty set */ public DERSet() { } /** * @param obj - a single object that makes up the set. */ public DERSet( ASN1Encodable obj) { super(obj); } /** * @param v - a vector of objects making up the set. */ public DERSet( ASN1EncodableVector v) { super(v, true); } /** * create a set from an array of objects. */ public DERSet( ASN1Encodable[] a) { super(a, true); } DERSet( ASN1EncodableVector v, boolean doSort) { super(v, doSort); } private int getBodyLength() throws IOException { if (bodyLength < 0) { int length = 0; for (Enumeration e = this.getObjects(); e.hasMoreElements();) { Object obj = e.nextElement(); length += ((ASN1Encodable)obj).toASN1Primitive().toDERObject().encodedLength(); } bodyLength = length; } return bodyLength; } int encodedLength() throws IOException { int length = getBodyLength(); return 1 + StreamUtil.calculateBodyLength(length) + length; } /* * 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 outputting SET, * we also have to specify CONSTRUCTED, and the objects length. */ void encode( ASN1OutputStream out) throws IOException { ASN1OutputStream dOut = out.getDERSubStream(); int length = getBodyLength(); out.write(BERTags.SET | BERTags.CONSTRUCTED); out.writeLength(length); for (Enumeration e = this.getObjects(); e.hasMoreElements();) { Object obj = e.nextElement(); dOut.writeObject((ASN1Encodable)obj); } } }