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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction 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.

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package org.bouncycastle.pkcs;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.pkcs.Attribute;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

/**
 * The delta certificate request attribute defined in: https://datatracker.ietf.org/doc/draft-bonnell-lamps-chameleon-certs/
 */
public class DeltaCertificateRequestAttributeValue
    implements ASN1Encodable
{
    private final X500Name subject;
    private final SubjectPublicKeyInfo subjectPKInfo;
    private final Extensions extensions;
    private final AlgorithmIdentifier signatureAlgorithm;
    private final ASN1Sequence attrSeq;

    public DeltaCertificateRequestAttributeValue(Attribute attribute)
    {
        this(ASN1Sequence.getInstance(attribute.getAttributeValues()[0]));
    }

    public static DeltaCertificateRequestAttributeValue getInstance(Object o)
    {
        if (o instanceof DeltaCertificateDescriptor)
        {
            return (DeltaCertificateRequestAttributeValue)o;
        }
        
        if (o != null)
        {
            new DeltaCertificateRequestAttributeValue(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    DeltaCertificateRequestAttributeValue(ASN1Sequence attrSeq)
    {
        this.attrSeq = attrSeq;
        // TODO: validate attribute size

        int idx = 0;
        if (attrSeq.getObjectAt(0) instanceof ASN1TaggedObject)
        {
            subject = X500Name.getInstance(ASN1TaggedObject.getInstance(attrSeq.getObjectAt(0)), true);
            idx++;
        }
        else
        {
            subject = null;
        }

        subjectPKInfo = SubjectPublicKeyInfo.getInstance(attrSeq.getObjectAt(idx));
        idx++;

        Extensions ext = null;
        AlgorithmIdentifier sigAlg = null;

        if (idx != attrSeq.size())
        {
            while (idx < attrSeq.size())
            {
                ASN1TaggedObject tagObj = ASN1TaggedObject.getInstance(attrSeq.getObjectAt(idx));
                if (tagObj.getTagNo() == 1)
                {
                    ext = Extensions.getInstance(tagObj, true);
                }
                else if (tagObj.getTagNo() == 2)
                {
                    sigAlg = AlgorithmIdentifier.getInstance(tagObj, true);
                }
                else
                {
                    throw new IllegalArgumentException("unknown tag");
                }
                idx++;
            }
        }

        this.extensions = ext;
        this.signatureAlgorithm = sigAlg;
    }

    public X500Name getSubject()
    {
        return subject;
    }

    public SubjectPublicKeyInfo getSubjectPKInfo()
    {
        return subjectPKInfo;
    }

    public Extensions getExtensions()
    {
        return extensions;
    }

    public AlgorithmIdentifier getSignatureAlgorithm()
    {
        return signatureAlgorithm;
    }

    @Override
    public ASN1Primitive toASN1Primitive()
    {
        return attrSeq;
    }
}