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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;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.HashAlgorithm;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.HashedId8;

/**
 *  *     IssuerIdentifier ::= CHOICE {
 *         sha256AndDigest HashedId8,
 *         self HashAlgorithm,
 *         ...,
 *         sha384AndDigest HashedId8
 *     }
 * 
 */
public class IssuerIdentifier
    extends ASN1Object
    implements ASN1Choice
{

    public static final int sha256AndDigest = 0;
    public static final int self = 1;
    public static final int sha384AndDigest = 2;

    private final int choice;
    private final ASN1Encodable issuerIdentifier;


    public static IssuerIdentifier sha256AndDigest(HashedId8 data)
    {
        return new IssuerIdentifier(sha256AndDigest, data);
    }

    public static IssuerIdentifier self(HashAlgorithm data)
    {
        return new IssuerIdentifier(self, data);
    }


    public static IssuerIdentifier sha384AndDigest(HashedId8 data)
    {
        return new IssuerIdentifier(sha384AndDigest, data);
    }

    public IssuerIdentifier(int choice, ASN1Encodable value)
    {
        this.choice = choice;
        this.issuerIdentifier = value;
    }

    private IssuerIdentifier(ASN1TaggedObject ato)
    {
        choice = ato.getTagNo();
        Object o = ato.getObject();
        switch (choice)
        {
        case sha384AndDigest: // sha384AndDigest  HashedId8
        case sha256AndDigest: // sha256AndDigest HashId8
            issuerIdentifier = HashedId8.getInstance(o);
            break;
        case self: // self HashAlgorithm
            issuerIdentifier = HashAlgorithm.getInstance(o);
            break;
        default:
            throw new IllegalArgumentException("invalid choice value " + choice);
        }

    }

    public static IssuerIdentifier getInstance(Object choice)
    {
        if (choice instanceof IssuerIdentifier)
        {
            return (IssuerIdentifier)choice;
        }

        if (choice != null)
        {
            return new IssuerIdentifier(ASN1TaggedObject.getInstance(choice));
        }

        return null;

    }

    public boolean isSelf()
    {
        return choice == self;
    }

    public int getChoice()
    {
        return choice;
    }

    public ASN1Encodable getIssuerIdentifier()
    {
        return issuerIdentifier;
    }

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

}