| package org.bouncycastle.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( |
| ASN1EncodableVector v) |
| { |
| for (int i = 0; i != v.size(); i++) |
| { |
| this.addObject(v.get(i)); |
| } |
| } |
| |
| /** |
| * create a sequence containing an array of objects. |
| */ |
| public DERSequence( |
| ASN1Encodable[] a) |
| { |
| for (int i = 0; i != a.length; i++) |
| { |
| this.addObject(a[i]); |
| } |
| } |
| |
| /* |
| * A note on the implementation: |
| * <p> |
| * 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 |
| { |
| // TODO Intermediate buffer could be avoided if we could calculate expected length |
| 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); |
| } |
| } |