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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.ieee1609dot2;

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;

/**
 *  *   RecipientInfo ::= CHOICE {
 *     pskRecipInfo         PreSharedKeyRecipientInfo,
 *     symmRecipInfo        SymmRecipientInfo,
 *     certRecipInfo        PKRecipientInfo,
 *     signedDataRecipInfo  PKRecipientInfo,
 *     rekRecipInfo         PKRecipientInfo
 *   }
 * 
 */
public class RecipientInfo
    extends ASN1Object
    implements ASN1Choice
{
    public static final int pskRecipInfo = 0;
    public static final int symmRecipInfo = 1;
    public static final int certRecipInfo = 2;
    public static final int signedDataRecipInfo = 3;
    public static final int rekRecipInfo = 4;


    private final int choice;
    private final ASN1Encodable recipientInfo;


    public RecipientInfo(int choice, ASN1Encodable value)
    {
        this.choice = choice;
        this.recipientInfo = value;
    }

    private RecipientInfo(ASN1TaggedObject instance)
    {
        choice = instance.getTagNo();
        switch (choice)
        {
        case pskRecipInfo:
            recipientInfo = PreSharedKeyRecipientInfo.getInstance(instance.getObject());
            break;
        case symmRecipInfo:
            recipientInfo = SymmRecipientInfo.getInstance(instance.getObject());
            break;
        case certRecipInfo:
        case signedDataRecipInfo:
        case rekRecipInfo:
            recipientInfo = PKRecipientInfo.getInstance(instance.getObject());
            break;
        default:
            throw new IllegalArgumentException("invalid choice value " + choice);
        }
    }

    public static RecipientInfo getInstance(Object object)
    {
        if (object instanceof RecipientInfo)
        {
            return (RecipientInfo)object;
        }

        if (object != null)
        {
            return new RecipientInfo(ASN1TaggedObject.getInstance(object));
        }

        return null;

    }

    public int getChoice()
    {
        return choice;
    }

    public ASN1Encodable getRecipientInfo()
    {
        return recipientInfo;
    }


    public static RecipientInfo pskRecipInfo(PreSharedKeyRecipientInfo info)
    {
        return new RecipientInfo(pskRecipInfo, info);
    }

    public static RecipientInfo symmRecipInfo(SymmRecipientInfo info)
    {
        return new RecipientInfo(symmRecipInfo, info);
    }

    public static RecipientInfo certRecipInfo(PKRecipientInfo info)
    {
        return new RecipientInfo(certRecipInfo, info);
    }

    public static RecipientInfo signedDataRecipInfo(PKRecipientInfo info)
    {
        return new RecipientInfo(signedDataRecipInfo, info);
    }

    public static RecipientInfo rekRecipInfo(PKRecipientInfo info)
    {
        return new RecipientInfo(rekRecipInfo, info);
    }


    @Override
    public ASN1Primitive toASN1Primitive()
    {
        return new DERTaggedObject(choice, recipientInfo);
    }
}