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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.8 and up.

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package org.bouncycastle.asn1;

import java.io.IOException;

/**
 * Indefinite length SET and SET OF constructs.
 * 
 * Note: This does not know which syntax the set is!
 * 

 * Length field has value 0x80, and the set ends with two bytes of: 0x00, 0x00.
 * 

 * For X.690 syntax rules, see {@link ASN1Set}.
 * 

 * In brief: Constructing this form does not sort the supplied elements,
 * nor does the sorting happen before serialization. This is different
 * from the way {@link DERSet} does things.
 * 
 */
public class BERSet
    extends ASN1Set
{
    /**
     * Create an empty SET.
     */
    public BERSet()
    {
    }

    /**
     * Create a SET containing one object.
     *
     * @param element - a single object that makes up the set.
     */
    public BERSet(ASN1Encodable element)
    {
        super(element);
    }

    /**
     * Create a SET containing multiple objects.
     * @param elementVector a vector of objects making up the set.
     */
    public BERSet(ASN1EncodableVector elementVector)
    {
        super(elementVector, false);
    }

    /**
     * Create a SET from an array of objects.
     * @param elements an array of ASN.1 objects.
     */
    public BERSet(ASN1Encodable[] elements)
    {
        super(elements, false);
    }

    BERSet(boolean isSorted, ASN1Encodable[] elements)
    {
        super(isSorted, elements);
    }

    int encodedLength(boolean withTag) throws IOException
    {
        int totalLength = withTag ? 4 : 3;

        for (int i = 0, count = elements.length; i < count; ++i)
        {
            ASN1Primitive p = elements[i].toASN1Primitive();
            totalLength += p.encodedLength(true);
        }

        return totalLength;
    }

    void encode(ASN1OutputStream out, boolean withTag) throws IOException
    {
        out.writeEncodingIL(withTag, BERTags.CONSTRUCTED | BERTags.SET, elements);
    }
}