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This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).
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package org.bouncycastle.x509;

import java.io.IOException;
import java.security.Principal;
import java.security.cert.CertSelector;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AttCertIssuer;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.asn1.x509.V2Form;
import org.bouncycastle.jce.X509Principal;
import org.bouncycastle.util.Selector;

/**
 * Carrying class for an attribute certificate issuer.
 * @deprecated use org.bouncycastle.cert.AttributeCertificateIssuer
 */
public class AttributeCertificateIssuer
    implements CertSelector, Selector
{
    final ASN1Encodable form;

    /**
     * Set the issuer directly with the ASN.1 structure.
     * 
     * @param issuer The issuer
     */
    public AttributeCertificateIssuer(AttCertIssuer issuer)
    {
        form = issuer.getIssuer();
    }

    public AttributeCertificateIssuer(X500Principal principal)
        throws IOException
    {
        this(new X509Principal(principal.getEncoded()));
    }

    public AttributeCertificateIssuer(X509Principal principal)
    {
        form = new V2Form(GeneralNames.getInstance(new DERSequence(new GeneralName(principal))));
    }

    private Object[] getNames()
    {
        GeneralNames name;

        if (form instanceof V2Form)
        {
            name = ((V2Form)form).getIssuerName();
        }
        else
        {
            name = (GeneralNames)form;
        }

        GeneralName[] names = name.getNames();

        List l = new ArrayList(names.length);

        for (int i = 0; i != names.length; i++)
        {
            if (names[i].getTagNo() == GeneralName.directoryName)
            {
                try
                {
                    l.add(new X500Principal(
                        ((ASN1Encodable)names[i].getName()).toASN1Primitive().getEncoded()));
                }
                catch (IOException e)
                {
                    throw new RuntimeException("badly formed Name object");
                }
            }
        }

        return l.toArray(new Object[l.size()]);
    }

    /**
     * Return any principal objects inside the attribute certificate issuer
     * object.
     * 
     * @return an array of Principal objects (usually X500Principal)
     */
    public Principal[] getPrincipals()
    {
        Object[] p = this.getNames();
        List l = new ArrayList();

        for (int i = 0; i != p.length; i++)
        {
            if (p[i] instanceof Principal)
            {
                l.add(p[i]);
            }
        }

        return (Principal[])l.toArray(new Principal[l.size()]);
    }

    private boolean matchesDN(X500Principal subject, GeneralNames targets)
    {
        GeneralName[] names = targets.getNames();

        for (int i = 0; i != names.length; i++)
        {
            GeneralName gn = names[i];

            if (gn.getTagNo() == GeneralName.directoryName)
            {
                try
                {
                    if (new X500Principal(((ASN1Encodable)gn.getName()).toASN1Primitive().getEncoded()).equals(subject))
                    {
                        return true;
                    }
                }
                catch (IOException e)
                {
                }
            }
        }

        return false;
    }

    public Object clone()
    {
        return new AttributeCertificateIssuer(AttCertIssuer.getInstance(form));
    }

    public boolean match(Certificate cert)
    {
        if (!(cert instanceof X509Certificate))
        {
            return false;
        }

        X509Certificate x509Cert = (X509Certificate)cert;

        if (form instanceof V2Form)
        {
            V2Form issuer = (V2Form)form;
            if (issuer.getBaseCertificateID() != null)
            {
                return issuer.getBaseCertificateID().getSerial().getValue().equals(x509Cert.getSerialNumber())
                    && matchesDN(x509Cert.getIssuerX500Principal(), issuer.getBaseCertificateID().getIssuer());
            }

            GeneralNames name = issuer.getIssuerName();
            if (matchesDN(x509Cert.getSubjectX500Principal(), name))
            {
                return true;
            }
        }
        else
        {
            GeneralNames name = (GeneralNames)form;
            if (matchesDN(x509Cert.getSubjectX500Principal(), name))
            {
                return true;
            }
        }

        return false;
    }

    public boolean equals(Object obj)
    {
        if (obj == this)
        {
            return true;
        }

        if (!(obj instanceof AttributeCertificateIssuer))
        {
            return false;
        }

        AttributeCertificateIssuer other = (AttributeCertificateIssuer)obj;

        return this.form.equals(other.form);
    }

    public int hashCode()
    {
        return this.form.hashCode();
    }

    public boolean match(Object obj)
    {
        if (!(obj instanceof X509Certificate))
        {
            return false;
        }

        return match((Certificate)obj);
    }
}