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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.oer.its.ieee1609dot2dot1;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.PublicEncryptionKey;

/**
 * AdditionalParams ::= CHOICE {
 * original        ButterflyParamsOriginal,
 * unified         ButterflyExpansion,
 * compactUnified  ButterflyExpansion,
 * encryptionKey   PublicEncryptionKey,
 * ...
 * }
 */
public class AdditionalParams
    extends ASN1Object
    implements ASN1Choice
{

    public static final int original = 0;
    public static final int unified = 1;
    public static final int compactUnified = 2;
    public static final int encryptionKey = 3;


    protected final int choice;
    protected final ASN1Encodable additionalParams;


    private AdditionalParams(int choice, ASN1Encodable additionalParams)
    {
        switch (choice)
        {
        case original:
            this.additionalParams = ButterflyParamsOriginal.getInstance(additionalParams);
            break;
        case unified:
        case compactUnified:
            this.additionalParams = ButterflyExpansion.getInstance(additionalParams);
            break;
        case encryptionKey:
            this.additionalParams = PublicEncryptionKey.getInstance(additionalParams);
            break;

        default:
            throw new IllegalArgumentException("invalid choice value " + choice);
        }
        this.choice = choice;
    }

    private AdditionalParams(ASN1TaggedObject ato)
    {
        this(ato.getTagNo(), ato.getObject());
    }

    public static AdditionalParams getInstance(Object o)
    {
        if (o instanceof AdditionalParams)
        {
            return (AdditionalParams)o;
        }

        if (o != null)
        {
            return new AdditionalParams(ASN1TaggedObject.getInstance(o));
        }

        return null;
    }


    public static AdditionalParams original(ButterflyParamsOriginal value)
    {
        return new AdditionalParams(original, value);
    }

    public static AdditionalParams unified(ButterflyExpansion exp)
    {
        return new AdditionalParams(unified, exp);
    }

    public static AdditionalParams compactUnified(ButterflyExpansion exp)
    {
        return new AdditionalParams(compactUnified, exp);
    }

    public static AdditionalParams encryptionKey(PublicEncryptionKey pek)
    {
        return new AdditionalParams(encryptionKey, pek);
    }

    public int getChoice()
    {
        return choice;
    }

    public ASN1Encodable getAdditionalParams()
    {
        return additionalParams;
    }

    public ASN1Primitive toASN1Primitive()
    {
        return new DERTaggedObject(choice, additionalParams);
    }


}