81 lines
1.8 KiB
Java
81 lines
1.8 KiB
Java
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package org.thoughtcrime.bouncycastle.asn1;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Enumeration;
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public class DERSequence
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extends ASN1Sequence
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{
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/**
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* create an empty sequence
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*/
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public DERSequence()
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{
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}
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/**
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* create a sequence containing one object
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*/
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public DERSequence(
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DEREncodable obj)
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{
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this.addObject(obj);
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}
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/**
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* create a sequence containing a vector of objects.
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*/
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public DERSequence(
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DEREncodableVector v)
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{
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for (int i = 0; i != v.size(); i++)
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{
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this.addObject(v.get(i));
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}
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}
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/**
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* create a sequence containing an array of objects.
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*/
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public DERSequence(
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ASN1Encodable[] a)
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{
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for (int i = 0; i != a.length; i++)
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{
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this.addObject(a[i]);
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}
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}
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/*
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* A note on the implementation:
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* <p>
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* As DER requires the constructed, definite-length model to
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* be used for structured types, this varies slightly from the
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* ASN.1 descriptions given. Rather than just outputing SEQUENCE,
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* we also have to specify CONSTRUCTED, and the objects length.
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*/
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void encode(
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DEROutputStream out)
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throws IOException
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{
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// TODO Intermediate buffer could be avoided if we could calculate expected length
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ByteArrayOutputStream bOut = new ByteArrayOutputStream();
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DEROutputStream dOut = new DEROutputStream(bOut);
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Enumeration e = this.getObjects();
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while (e.hasMoreElements())
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{
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Object obj = e.nextElement();
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dOut.writeObject(obj);
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}
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dOut.close();
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byte[] bytes = bOut.toByteArray();
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out.writeEncoded(SEQUENCE | CONSTRUCTED, bytes);
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}
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}
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