X509ExtensionUtil.cs :  » PDF » iTextSharp » Org » BouncyCastle » X509 » Extension » C# / CSharp Open Source

using System;
using System.Collections;
using System.IO;

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

namespace Org.BouncyCastle.X509.Extension{
  public class X509ExtensionUtilities
  {
    public static Asn1Object FromExtensionValue(
      Asn1OctetString extensionValue)
    {
      return Asn1Object.FromByteArray(extensionValue.GetOctets());
    }

    public static ICollection GetIssuerAlternativeNames(
      X509Certificate cert)
    {
      Asn1OctetString extVal = cert.GetExtensionValue(X509Extensions.IssuerAlternativeName);

      return GetAlternativeName(extVal);
    }

    public static ICollection GetSubjectAlternativeNames(
      X509Certificate cert)
    {        
      Asn1OctetString extVal = cert.GetExtensionValue(X509Extensions.SubjectAlternativeName);

      return GetAlternativeName(extVal);
    }

    private static ICollection GetAlternativeName(
      Asn1OctetString extVal)
    {
      ArrayList temp = new ArrayList();

      if (extVal != null)
      {
        try
        {
          Asn1Sequence seq = DerSequence.GetInstance(FromExtensionValue(extVal));

          foreach (GeneralName genName in seq)
          {
            ArrayList list = new ArrayList();
            list.Add(genName.TagNo);

            switch (genName.TagNo)
            {
              case GeneralName.EdiPartyName:
              case GeneralName.X400Address:
              case GeneralName.OtherName:
                list.Add(genName.Name.ToAsn1Object());
                break;
              case GeneralName.DirectoryName:
                list.Add(X509Name.GetInstance(genName.Name).ToString());
                break;
              case GeneralName.DnsName:
              case GeneralName.Rfc822Name:
              case GeneralName.UniformResourceIdentifier:
                list.Add(((IAsn1String)genName.Name).GetString());
                break;
              case GeneralName.RegisteredID:
                list.Add(DerObjectIdentifier.GetInstance(genName.Name).Id);
                break;
              case GeneralName.IPAddress:
                list.Add(DerOctetString.GetInstance(genName.Name).GetOctets());
                break;
              default:
                throw new IOException("Bad tag number: " + genName.TagNo);
            }

            temp.Add(list);
          }
        }
        catch (Exception e)
        {
          throw new CertificateParsingException(e.Message);
        }
      }

      return temp;
    }
  }
}