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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 are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.pkcs;

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.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

public class DeltaCertificateRequestAttributeValueBuilder
{
    private final SubjectPublicKeyInfo subjectPublicKey;

    private AlgorithmIdentifier signatureAlgorithm;
    private X500Name subject;

    public DeltaCertificateRequestAttributeValueBuilder(SubjectPublicKeyInfo subjectPublicKey)
    {
        this.subjectPublicKey = subjectPublicKey;
    }

    public DeltaCertificateRequestAttributeValueBuilder setSignatureAlgorithm(AlgorithmIdentifier signatureAlgorithm)
    {
       this.signatureAlgorithm = signatureAlgorithm;

       return this;
    }

    public DeltaCertificateRequestAttributeValueBuilder setSubject(X500Name subject)
    {
       this.subject = subject;

       return this;
    }

    public DeltaCertificateRequestAttributeValue build()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        if (subject != null)
        {
            v.add(new DERTaggedObject(false, 0, subject));
        }
        v.add(subjectPublicKey);
        if (signatureAlgorithm != null)
        {
            v.add(new DERTaggedObject(false, 2, signatureAlgorithm));
        }

        
        return new DeltaCertificateRequestAttributeValue(new Attribute(new ASN1ObjectIdentifier("2.16.840.1.114027.80.6.2"),
                        new DERSet(new DERSequence(v))));
    }
}