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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.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))));
    }
}