Org.BouncyCastle.X509.X509CertificateParser.ReadCertificate C# (CSharp) Method

        public X509Certificate ReadCertificate(
            Stream inStream)
        {
            if (inStream == null)
                throw new ArgumentNullException("inStream");
            if (!inStream.CanRead)
                throw new ArgumentException("inStream must be read-able", "inStream");

            if (currentStream == null)
            {
                currentStream = inStream;
                sData = null;
                sDataObjectCount = 0;
            }
            else if (currentStream != inStream) // reset if input stream has changed
            {
                currentStream = inStream;
                sData = null;
                sDataObjectCount = 0;
            }

            try
            {
                if (sData != null)
                {
                    if (sDataObjectCount != sData.Count)
                    {
                        return GetCertificate();
                    }

                    sData = null;
                    sDataObjectCount = 0;
                    return null;
                }

                PushbackStream pis = new PushbackStream(inStream);
                int tag = pis.ReadByte();

                if (tag < 0)
                    return null;

                pis.Unread(tag);

                if (tag != 0x30)  // assume ascii PEM encoded.
                {
                    return ReadPemCertificate(pis);
                }

                return ReadDerCertificate(new Asn1InputStream(pis));
            }
            catch (Exception e)
            {
                throw new CertificateException("Failed to read certificate", e);
            }
        }

		private void baseTest()
		{
//			CertificateFactory cf = CertificateFactory.getInstance("X.509", "BC");
			X509CertificateParser certParser = new X509CertificateParser();
			X509CrlParser crlParser = new X509CrlParser();

			// initialise CertStore
			X509Certificate rootCert = certParser.ReadCertificate(CertPathTest.rootCertBin);
			X509Certificate interCert = certParser.ReadCertificate(CertPathTest.interCertBin);
			X509Certificate finalCert = certParser.ReadCertificate(CertPathTest.finalCertBin);
			X509Crl rootCrl = crlParser.ReadCrl(CertPathTest.rootCrlBin);
			X509Crl interCrl = crlParser.ReadCrl(CertPathTest.interCrlBin);

			IList certList = new ArrayList();
			certList.Add(rootCert);
			certList.Add(interCert);
			certList.Add(finalCert);

			IList crlList = new ArrayList();
			crlList.Add(rootCrl);
			crlList.Add(interCrl);

//			CollectionCertStoreParameters ccsp = new CollectionCertStoreParameters(list);
//			CertStore store = CertStore.getInstance("Collection", ccsp, "BC");
			IX509Store x509CertStore = X509StoreFactory.Create(
				"Certificate/Collection",
				new X509CollectionStoreParameters(certList));
			IX509Store x509CrlStore = X509StoreFactory.Create(
				"CRL/Collection",
				new X509CollectionStoreParameters(crlList));

			// NB: Month is 1-based in .NET
            //DateTime validDate = new DateTime(2008, 9, 4, 14, 49, 10).ToUniversalTime();
            DateTime validDate = new DateTime(2008, 9, 4, 5, 49, 10);//.ToUniversalTime();

			//Searching for rootCert by subjectDN without CRL
			ISet trust = new HashSet();
			trust.Add(new TrustAnchor(rootCert, null));

//			CertPathBuilder cpb = CertPathBuilder.getInstance("PKIX","BC");
			PkixCertPathBuilder cpb = new PkixCertPathBuilder();
			X509CertStoreSelector targetConstraints = new X509CertStoreSelector();
			targetConstraints.Subject = finalCert.SubjectDN;
			PkixBuilderParameters parameters = new PkixBuilderParameters(trust, targetConstraints);
//			parameters.addCertStore(store);
			parameters.AddStore(x509CertStore);
			parameters.AddStore(x509CrlStore);
			parameters.Date = new DateTimeObject(validDate);
			PkixCertPathBuilderResult result = cpb.Build(parameters);
			PkixCertPath path = result.CertPath;

			if (path.Certificates.Count != 2)
			{
				Fail("wrong number of certs in baseTest path");
			}
		}