Org.BouncyCastle.Pkix.PkixNameConstraintValidator.CheckPermittedDNS C# (CSharp) Method

        private void CheckPermittedDNS(ISet permitted, String dns)
        //throws PkixNameConstraintValidatorException
        {
            if (permitted == null)
            {
                return;
            }

            IEnumerator it = permitted.GetEnumerator();

            while (it.MoveNext())
            {
                String str = ((String)it.Current);

                // is sub domain
                if (WithinDomain(dns, str) || dns.ToUpper().Equals(str.ToUpper()))
                {
                    return;
                }
            }
            if (dns.Length == 0 && permitted.Count == 0)
            {
                return;
            }
            throw new PkixNameConstraintValidatorException(
                "DNS is not from a permitted subtree.");
        }