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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.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 *  *     TargetEtcChain ::= SEQUENCE {
 *         target                       CertEtcToken,
 *         chain                        SEQUENCE SIZE (1..MAX) OF
 *                                         CertEtcToken OPTIONAL,
 *         pathProcInput                [0] PathProcInput OPTIONAL
 *     }
 * 
 */

public class TargetEtcChain
    extends ASN1Object
{
    private CertEtcToken target;
    private ASN1Sequence chain;
    private PathProcInput pathProcInput;

    public TargetEtcChain(CertEtcToken target)
    {
        this(target, null, null);
    }

    public TargetEtcChain(CertEtcToken target, CertEtcToken[] chain)
    {
        this(target, chain, null);
    }

    public TargetEtcChain(CertEtcToken target, PathProcInput pathProcInput)
    {
        this(target, null, pathProcInput);
    }

    public TargetEtcChain(CertEtcToken target, CertEtcToken[] chain, PathProcInput pathProcInput)
    {
        this.target = target;

        if (chain != null)
        {
            this.chain = new DERSequence(chain);
        }

        this.pathProcInput = pathProcInput;
    }

    private TargetEtcChain(ASN1Sequence seq)
    {
        int i = 0;
        ASN1Encodable obj = seq.getObjectAt(i++);
        this.target = CertEtcToken.getInstance(obj);

        if (seq.size() > 1)
        {
            obj = seq.getObjectAt(i++);
            if (obj instanceof ASN1TaggedObject)
            {
                extractPathProcInput(obj);
            }
            else
            {
                this.chain = ASN1Sequence.getInstance(obj);
                if (seq.size() > 2)
                {
                    obj = seq.getObjectAt(i);
                    extractPathProcInput(obj);
                }
            }
        }
    }

    private void extractPathProcInput(ASN1Encodable obj)
    {
        ASN1TaggedObject tagged = ASN1TaggedObject.getInstance(obj);
        switch (tagged.getTagNo())
        {
        case 0:
            this.pathProcInput = PathProcInput.getInstance(tagged, false);
            break;
        default:
            throw new IllegalArgumentException("Unknown tag encountered: " + tagged.getTagNo());
        }
    }

    public static TargetEtcChain getInstance(Object obj)
    {
        if (obj instanceof TargetEtcChain)
        {
            return (TargetEtcChain)obj;
        }
        else if (obj != null)
        {
            return new TargetEtcChain(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public static TargetEtcChain getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);
        v.add(target);
        if (chain != null)
        {
            v.add(chain);
        }
        if (pathProcInput != null)
        {
            v.add(new DERTaggedObject(false, 0, pathProcInput));
        }

        return new DERSequence(v);
    }

    public String toString()
    {
        StringBuffer s = new StringBuffer();
        s.append("TargetEtcChain {\n");
        s.append("target: " + target + "\n");
        if (chain != null)
        {
            s.append("chain: " + chain + "\n");
        }
        if (pathProcInput != null)
        {
            s.append("pathProcInput: " + pathProcInput + "\n");
        }
        s.append("}\n");
        return s.toString();
    }


    public CertEtcToken getTarget()
    {
        return target;
    }

    public CertEtcToken[] getChain()
    {
        if (chain != null)
        {
            return CertEtcToken.arrayFromSequence(chain);
        }

        return null;
    }

    public PathProcInput getPathProcInput()
    {
        return pathProcInput;
    }

    public static TargetEtcChain[] arrayFromSequence(ASN1Sequence seq)
    {
        TargetEtcChain[] tmp = new TargetEtcChain[seq.size()];

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

        return tmp;
    }
}