System.Net.Security.NegotiateStreamPal.GssUnwrap C# (CSharp) Method

        private static int GssUnwrap(
            SafeGssContextHandle context,
            byte[] buffer,
            int offset,
            int count)
        {
            Debug.Assert((buffer != null) && (buffer.Length > 0), "Invalid input buffer passed to Decrypt");
            Debug.Assert((offset >= 0) && (offset <= buffer.Length), "Invalid input offset passed to Decrypt");
            Debug.Assert((count >= 0) && (count <= (buffer.Length - offset)), "Invalid input count passed to Decrypt");

            Interop.NetSecurityNative.GssBuffer decryptedBuffer = default(Interop.NetSecurityNative.GssBuffer);
            try
            {
                Interop.NetSecurityNative.Status minorStatus;
                Interop.NetSecurityNative.Status status = Interop.NetSecurityNative.UnwrapBuffer(out minorStatus, context, buffer, offset, count, ref decryptedBuffer);
                if (status != Interop.NetSecurityNative.Status.GSS_S_COMPLETE)
                {
                    throw new Interop.NetSecurityNative.GssApiException(status, minorStatus);
                }

                return decryptedBuffer.Copy(buffer, offset);
            }
            finally
            {
                decryptedBuffer.Dispose();
            }
        }