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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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]));
    }

    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, false);
                }
                else if (tagObj.getTagNo() == 2)
                {
                    sigAlg = AlgorithmIdentifier.getInstance(tagObj, false);
                }
                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;
    }
}