Microsoft.AspNetCore.Authentication.ActiveDirectory.HandshakeState.TryAcquireServerChallenge C# (CSharp) Method

        public bool TryAcquireServerChallenge(ref byte[] message)
        {
            SecurityBufferDesciption clientToken = new SecurityBufferDesciption(message);
            SecurityBufferDesciption serverToken = new SecurityBufferDesciption(Constants.MaximumTokenSize);

            try
            {
                int result;
                var lifetime = new SecurityInteger(0);

                result = Interop.AcquireCredentialsHandle(
                    null,
                    "NTLM",
                    Constants.SecurityCredentialsInbound,
                    IntPtr.Zero,
                    IntPtr.Zero,
                    0,
                    IntPtr.Zero,
                    ref this.Credentials,
                    ref lifetime);

                if (result != Constants.SuccessfulResult)
                {
                    // Credentials acquire operation failed.
                    return false;
                }

                uint contextAttributes;

                result = Interop.AcceptSecurityContext(
                    ref this.Credentials,                       // [in] handle to the credentials
                    IntPtr.Zero,                                // [in/out] handle of partially formed context.  Always NULL the first time through
                    ref clientToken,                            // [in] pointer to the input buffers
                    Constants.StandardContextAttributes,           // [in] required context attributes
                    Constants.SecurityNativeDataRepresentation,    // [in] data representation on the target
                    out this.Context,                           // [in/out] receives the new context handle    
                    out serverToken,                            // [in/out] pointer to the output buffers
                    out contextAttributes,                      // [out] receives the context attributes        
                    out lifetime);                              // [out] receives the life span of the security context

                if (result != Constants.IntermediateResult)
                {
                    // Client challenge issue operation failed.
                    return false;
                }
            }
            finally
            {
                message = serverToken.GetBytes();
                clientToken.Dispose();
                serverToken.Dispose();
            }

            return true;
        }