org.apache.commons.ssl.asn1.DERSequence Maven / Gradle / Ivy

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package org.apache.commons.ssl.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));
        }
    }

    /** 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:
    * 
    * 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);
    }
}