ActionScript Function Converted To VB.NET

I need somebody to convert the attached function to VB.NET including processing the function inputs. Please check the attached files for more details. Also attached is a fully functional VB.NET solution that will perform the entire process that the function runs so that you can test it, all that needs changing is 3 lines: Dim AssertCaps As String = "" ' Needs Working Out Dim InterestCaps As String = "" ' Needs Working Out Dim Sha256 As String = "" ' Needs Working Out