PrincipalUtil.cs :  » PDF » iTextSharp » Org » BouncyCastle » X509 » C# / CSharp Open Source

using System;
using System.IO;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Security.Certificates;

namespace Org.BouncyCastle.X509{
  /// <remarks>
  /// A utility class that will extract X509Principal objects from X.509 certificates.
  /// <p>
  /// 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.</p>
  /// </remarks>
  public class PrincipalUtilities
  {
    /// <summary>Return the issuer of the given cert as an X509Principal.</summary>
    public static X509Name GetIssuerX509Principal(
      X509Certificate cert)
    {
      try
      {
        TbsCertificateStructure tbsCert = TbsCertificateStructure.GetInstance(
          Asn1Object.FromByteArray(cert.GetTbsCertificate()));

        return tbsCert.Issuer;
      }
      catch (Exception e)
      {
        throw new CertificateEncodingException("Could not extract issuer", e);
      }
    }

    /// <summary>Return the subject of the given cert as an X509Principal.</summary>
    public static X509Name GetSubjectX509Principal(
      X509Certificate cert)
    {
      try
      {
        TbsCertificateStructure tbsCert = TbsCertificateStructure.GetInstance(
          Asn1Object.FromByteArray(cert.GetTbsCertificate()));

        return tbsCert.Subject;
      }
      catch (Exception e)
      {
        throw new CertificateEncodingException("Could not extract subject", e);
      }
    }

    /// <summary>Return the issuer of the given CRL as an X509Principal.</summary>
    public static X509Name GetIssuerX509Principal(
      X509Crl crl)
    {
      try
      {
        TbsCertificateList tbsCertList = TbsCertificateList.GetInstance(
          Asn1Object.FromByteArray(crl.GetTbsCertList()));

        return tbsCertList.Issuer;
      }
      catch (Exception e)
      {
        throw new CrlException("Could not extract issuer", e);
      }
    }
  }
}