Org.BouncyCastle.X509.X509Certificate.GetBasicConstraints C# (CSharp) Method

        public virtual int GetBasicConstraints()
        {
            if (basicConstraints != null && basicConstraints.IsCA())
            {
                if (basicConstraints.PathLenConstraint == null)
                {
                    return int.MaxValue;
                }

                return basicConstraints.PathLenConstraint.IntValue;
            }

            return -1;
        }

        /// Validates that the certificate provided is a CA certificate.
        /// </summary>
        /// <param name="certificate">The certificate to validate.</param>
        /// <param name="certificationPathLength">The allowed certification path length.</param>
        /// <returns><c>null</c> if the certificate info does not allow to determine the CA status;
        /// otherwise, a boolean value indicating the CA status.</null></returns>
        private static bool?IsCA(Org.BouncyCastle.X509.X509Certificate certificate, out int certificationPathLength)
        {
            // If certificate version equal to 3 then the isCA property can be retrieved.
            if (certificate.Version == 3)
            {
                // A value of -1 indicates certificate is not a CA.
                // A value of Integer.MAX_VALUE indicates there is no limit on the allowed length of the certification path.
                certificationPathLength = certificate.GetBasicConstraints();
                return(certificationPathLength != -1);
            }

            certificationPathLength = -1;
            return(null);
        }