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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.cert.jcajce;

import java.security.cert.X509Certificate;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.X500NameStyle;
import org.bouncycastle.jcajce.interfaces.BCX509Certificate;

public class JcaX500NameUtil
{
    public static X500Name getIssuer(X509Certificate certificate)
    {
        if (certificate instanceof BCX509Certificate)
        {
            return notNull(((BCX509Certificate)certificate).getIssuerX500Name());
        }
        return getX500Name(certificate.getIssuerX500Principal());
    }

    public static X500Name getIssuer(X500NameStyle style, X509Certificate certificate)
    {
        if (certificate instanceof BCX509Certificate)
        {
            return X500Name.getInstance(style, notNull(((BCX509Certificate)certificate).getIssuerX500Name()));
        }
        return getX500Name(style, certificate.getIssuerX500Principal());
    }

    public static X500Name getSubject(X509Certificate certificate)
    {
        if (certificate instanceof BCX509Certificate)
        {
            return notNull(((BCX509Certificate)certificate).getSubjectX500Name());
        }
        return getX500Name(certificate.getSubjectX500Principal());
    }

    public static X500Name getSubject(X500NameStyle style, X509Certificate certificate)
    {
        if (certificate instanceof BCX509Certificate)
        {
            return X500Name.getInstance(style, notNull(((BCX509Certificate)certificate).getSubjectX500Name()));
        }
        return getX500Name(style, certificate.getSubjectX500Principal());
    }

    public static X500Name getX500Name(X500Principal principal)
    {
        return X500Name.getInstance(getEncoded(principal));
    }

    public static X500Name getX500Name(X500NameStyle style, X500Principal principal)
    {
        return X500Name.getInstance(style, getEncoded(principal));
    }

    private static X500Name notNull(X500Name name)
    {
        if (null == name)
        {
            throw new IllegalStateException();
        }
        return name;
    }

    private static X500Principal notNull(X500Principal principal)
    {
        if (null == principal)
        {
            throw new IllegalStateException();
        }
        return principal;
    }

    private static byte[] getEncoded(X500Principal principal)
    {
        return notNull(principal).getEncoded();
    }
}