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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.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERTaggedObject;


/**
 * ButterflyExpansion ::= CHOICE {
 * aes128      OCTET STRING (SIZE(16)),
 * ...
 * }
 */
public class ButterflyExpansion
    extends ASN1Object
    implements ASN1Choice
{
    public static final int aes128 = 0;

    protected final int choice;
    protected final ASN1Encodable butterflyExpansion;

    ButterflyExpansion(int choice, ASN1Encodable butterflyExpansion)
    {
        this.choice = choice;
        this.butterflyExpansion = butterflyExpansion;
    }

    private ButterflyExpansion(ASN1TaggedObject ato)
    {
        choice = ato.getTagNo();
        switch (choice)
        {

        case aes128:
            this.butterflyExpansion = DEROctetString.getInstance(ato.getObject());
            break;
        default:
            throw new IllegalArgumentException("invalid choice value " + choice);
        }
    }

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

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

        return null;
    }

    public static ButterflyExpansion aes128(byte[] value)
    {
        if (value.length != 16)
        {
            throw new IllegalArgumentException("length must be 16");
        }
        return new ButterflyExpansion(aes128, new DEROctetString(value));
    }

    public static ButterflyExpansion aes128(ASN1OctetString value)
    {
        return aes128(value.getOctets());
    }


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

    public int getChoice()
    {
        return choice;
    }

    public ASN1Encodable getButterflyExpansion()
    {
        return butterflyExpansion;
    }

}