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 package org.bouncycastle.jce;
 
 
a utility class that will extract X509Principal objects from X.509 certificates.

Use this in preference to trying to recreate a principal from a String, not all DNs are what they should be, so it's best to leave them encoded where they can be.

public class PrincipalUtil
{
    
return the issuer of the given cert as an X509PrincipalObject.
    public static X509Principal getIssuerX509Principal(
        X509Certificate cert)
        throws CertificateEncodingException
    {
        try
        {
            TBSCertificateStructure tbsCert = TBSCertificateStructure.getInstance(
                    ASN1Primitive.fromByteArray(cert.getTBSCertificate()));
            return new X509Principal(X509Name.getInstance(tbsCert.getIssuer()));
        }
        catch (IOException e)
        {
            throw new CertificateEncodingException(e.toString());
        }
    }

    
return the subject of the given cert as an X509PrincipalObject.
    public static X509Principal getSubjectX509Principal(
        X509Certificate cert)
        throws CertificateEncodingException
    {
        try
        {
            TBSCertificateStructure tbsCert = TBSCertificateStructure.getInstance(
                    ASN1Primitive.fromByteArray(cert.getTBSCertificate()));
            return new X509Principal(X509Name.getInstance(tbsCert.getSubject()));
        }
        catch (IOException e)
        {
            throw new CertificateEncodingException(e.toString());
        }
    }
    
    
return the issuer of the given CRL as an X509PrincipalObject.
    public static X509Principal getIssuerX509Principal(
        X509CRL crl)
        throws CRLException
    {
        try
        {
            TBSCertList tbsCertList = TBSCertList.getInstance(
                ASN1Primitive.fromByteArray(crl.getTBSCertList()));
            return new X509Principal(X509Name.getInstance(tbsCertList.getIssuer()));
        }
        catch (IOException e)
        {
            throw new CRLException(e.toString());
        }
    }
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