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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;

/**
 * Parser for indefinite-length tagged objects.
 */
class BERTaggedObjectParser
    implements ASN1TaggedObjectParser
{
    final int _tagClass;
    final int _tagNo;
    final ASN1StreamParser _parser;

    BERTaggedObjectParser(int tagClass, int tagNo, ASN1StreamParser parser)
    {
        _tagClass = tagClass;
        _tagNo = tagNo;
        _parser = parser;
    }

    public int getTagClass()
    {
        return _tagClass;
    }

    public int getTagNo()
    {
        return _tagNo;
    }

    public boolean hasContextTag()
    {
        return this._tagClass == BERTags.CONTEXT_SPECIFIC;
    }

    public boolean hasContextTag(int tagNo)
    {
        return this._tagClass == BERTags.CONTEXT_SPECIFIC && this._tagNo == tagNo;
    }

    public boolean hasTag(int tagClass, int tagNo)
    {
        return this._tagClass == tagClass && this._tagNo == tagNo;
    }

    public boolean hasTagClass(int tagClass)
    {
        return this._tagClass == tagClass;
    }

    /**
     * Return an in-memory, encodable, representation of the tagged object.
     *
     * @return an ASN1TaggedObject.
     * @throws IOException if there is an issue loading the data.
     */
    public ASN1Primitive getLoadedObject()
        throws IOException
    {
        return _parser.loadTaggedIL(_tagClass, _tagNo);
    }

    public ASN1Encodable parseBaseUniversal(boolean declaredExplicit, int baseTagNo) throws IOException
    {
        if (declaredExplicit)
        {
            return _parser.parseObject(baseTagNo);
        }

        return _parser.parseImplicitConstructedIL(baseTagNo);
    }

    public ASN1Encodable parseExplicitBaseObject() throws IOException
    {
        return _parser.readObject();
    }

    public ASN1TaggedObjectParser parseExplicitBaseTagged() throws IOException
    {
        return _parser.parseTaggedObject();
    }

    public ASN1TaggedObjectParser parseImplicitBaseTagged(int baseTagClass, int baseTagNo) throws IOException
    {
        return new BERTaggedObjectParser(baseTagClass, baseTagNo, _parser);
    }

    /**
     * Return an ASN1TaggedObject representing this parser and its contents.
     *
     * @return an ASN1TaggedObject
     */
    public ASN1Primitive toASN1Primitive()
    {
        try
        {
            return getLoadedObject();
        }
        catch (IOException e)
        {
            throw new ASN1ParsingException(e.getMessage());
        }
    }
}