private long? GetCRLNumber(Org.BouncyCastle.X509.X509Crl crlEntry)
{
Asn1OctetString extValue = crlEntry.GetExtensionValue(Org.BouncyCastle.Asn1.X509.X509Extensions.CrlNumber);
if (extValue != null)
{
Asn1Object asn1Value = Org.BouncyCastle.X509.Extension.X509ExtensionUtilities.FromExtensionValue(extValue);
return DerInteger.GetInstance(asn1Value).PositiveValue.LongValue;
}
return null;
}