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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 1.8 and up. 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 java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.pkcs.Attribute;
import org.bouncycastle.asn1.pkcs.CertificationRequest;
import org.bouncycastle.asn1.pkcs.CertificationRequestInfo;
import org.bouncycastle.operator.ContentVerifierProvider;

public class DeltaCertAttributeUtils
{
    public static boolean isDeltaRequestSignatureValid(PKCS10CertificationRequest baseRequest, ContentVerifierProvider contentVerifierProvider)
        throws PKCSException
    {
        Attribute[] attributes = baseRequest.getAttributes(new ASN1ObjectIdentifier("2.16.840.1.114027.80.6.2"));

        DeltaCertificateRequestAttributeValue deltaReq = new DeltaCertificateRequestAttributeValue(attributes[0]);

        attributes = baseRequest.getAttributes(new ASN1ObjectIdentifier("2.16.840.1.114027.80.6.3"));

        CertificationRequest deltaPkcs10 = baseRequest.toASN1Structure();
        CertificationRequestInfo deltaInfo = deltaPkcs10.getCertificationRequestInfo();

        ASN1EncodableVector deltaPkcs10InfoV = new ASN1EncodableVector();
        deltaPkcs10InfoV.add(deltaInfo.getVersion());
        deltaPkcs10InfoV.add(deltaInfo.getSubject());
        deltaPkcs10InfoV.add(deltaInfo.getSubjectPublicKeyInfo());

        ASN1EncodableVector attrSetV = new ASN1EncodableVector();
        for (Enumeration en = deltaInfo.getAttributes().getObjects(); en.hasMoreElements();)
        {
            Attribute attr = Attribute.getInstance(en.nextElement());

            if (!attr.getAttrType().equals(new ASN1ObjectIdentifier("2.16.840.1.114027.80.6.3")))
            {
                attrSetV.add(attr);
            }
        }

        deltaPkcs10InfoV.add(new DERTaggedObject(false, 0, new DERSet(attrSetV)));

        ASN1EncodableVector deltaPkcs10V = new ASN1EncodableVector();

        deltaPkcs10V.add(new DERSequence(deltaPkcs10InfoV));
        deltaPkcs10V.add(deltaReq.getSignatureAlgorithm());
        deltaPkcs10V.add(attributes[0].getAttributeValues()[0]);

        PKCS10CertificationRequest deltaPkcs10Req = new PKCS10CertificationRequest(CertificationRequest.getInstance(new DERSequence(deltaPkcs10V)));

        return deltaPkcs10Req.isSignatureValid(contentVerifierProvider);
    }
}