http://www.bouncycastle.org/java.html: 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 1.5 to JDK 1.8.
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package org.bouncycastle.asn1;

import java.io.IOException;


Parser class for DER SEQUENCEs.

/**
 * Parser class for DER SEQUENCEs.
 */
public class DERSequenceParser
    implements ASN1SequenceParser
{
    private ASN1StreamParser _parser;

    DERSequenceParser(ASN1StreamParser parser)
    {
        this._parser = parser;
    }

    
Return the next object in the SEQUENCE.

Throws:
  • IOException – if there is an issue loading the object.
Returns:next object in SEQUENCE.
/**
     * Return the next object in the SEQUENCE.
     *
     * @return next object in SEQUENCE.
     * @throws IOException if there is an issue loading the object.
     */
    public ASN1Encodable readObject()
        throws IOException
    {
        return _parser.readObject();
    }

    
Return an in memory, encodable, representation of the SEQUENCE.

Throws:
Returns:a DERSequence.
/**
     * Return an in memory, encodable, representation of the SEQUENCE.
     *
     * @return a DERSequence.
     * @throws IOException if there is an issue loading the data.
     */
    public ASN1Primitive getLoadedObject()
        throws IOException
    {
         return new DERSequence(_parser.readVector());
    }

    
Return a DERSequence representing this parser and its contents.

Returns:a DERSequence.
/**
     * Return a DERSequence representing this parser and its contents.
     *
     * @return a DERSequence.
     */
    public ASN1Primitive toASN1Primitive()
    {
        try
        {
            return getLoadedObject();
        }
        catch (IOException e)
        {
            throw new IllegalStateException(e.getMessage());
        }
    }
}