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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.asn1.dvcs;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.DigestInfo;

/**
 *  * Data ::= CHOICE {
 *   message           OCTET STRING ,
 *   messageImprint    DigestInfo,
 *   certs             [0] SEQUENCE SIZE (1..MAX) OF
 *                         TargetEtcChain
 * }
 * 
 */

public class Data
    extends ASN1Object
    implements ASN1Choice
{
    private ASN1OctetString message;
    private DigestInfo messageImprint;
    private ASN1Sequence certs;

    public Data(byte[] messageBytes)
    {
        this.message = new DEROctetString(messageBytes);
    }

    public Data(ASN1OctetString message)
    {
        this.message = message;
    }

    public Data(DigestInfo messageImprint)
    {
        this.messageImprint = messageImprint;
    }

    public Data(TargetEtcChain cert)
    {
        this.certs = new DERSequence(cert);
    }

    public Data(TargetEtcChain[] certs)
    {
        this.certs = new DERSequence(certs);
    }

    private Data(ASN1Sequence certs)
    {
        this.certs = certs;
    }

    public static Data getInstance(Object obj)
    {
        if (obj instanceof Data)
        {
            return (Data)obj;
        }
        else if (obj instanceof ASN1OctetString)
        {
            return new Data((ASN1OctetString)obj);
        }
        else if (obj instanceof ASN1Sequence)
        {
            return new Data(DigestInfo.getInstance(obj));
        }
        else if (obj instanceof ASN1TaggedObject)
        {
            return new Data(ASN1Sequence.getInstance((ASN1TaggedObject)obj, false));
        }
        throw new IllegalArgumentException("Unknown object submitted to getInstance: " + obj.getClass().getName());
    }

    public static Data getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance(obj.getObject());
    }

    public ASN1Primitive toASN1Primitive()
    {
        if (message != null)
        {
            return message.toASN1Primitive();
        }
        if (messageImprint != null)
        {
            return messageImprint.toASN1Primitive();
        }
        else
        {
            return new DERTaggedObject(false, 0, certs);
        }
    }

    public String toString()
    {
        if (message != null)
        {
            return "Data {\n" + message + "}\n";
        }
        if (messageImprint != null)
        {
            return "Data {\n" + messageImprint + "}\n";
        }
        else
        {
            return "Data {\n" + certs + "}\n";
        }
    }

    public ASN1OctetString getMessage()
    {
        return message;
    }

    public DigestInfo getMessageImprint()
    {
        return messageImprint;
    }

    public TargetEtcChain[] getCerts()
    {
        if (certs == null)
        {
            return null;
        }

        TargetEtcChain[] tmp = new TargetEtcChain[certs.size()];

        for (int i = 0; i != tmp.length; i++)
        {
            tmp[i] = TargetEtcChain.getInstance(certs.getObjectAt(i));
        }

        return tmp;
    }
}