(VB.NET) IKOF Generation Code for Montenegro Fiscalization Service

Demonstrates computing the IKOF MD5 summary value as described in section 4.3 of this document: https://poreskauprava.gov.me/ResourceManager/FileDownload.aspx?rId=416042&rType=2

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim concatenatedParams As String = "12345678|2019-06-12T17:05:43+02:00|9952|bb123bb1231|cc123cc1231|ss123ss123|199.01"

' Get the private key from a pfx file.
Dim pfx As New Chilkat.Pfx
Dim success As Boolean = pfx.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
If (success <> True) Then
    Debug.WriteLine(pfx.LastErrorText)
    Exit Sub
End If

Dim privKey As Chilkat.PrivateKey = pfx.GetPrivateKey(0)
If (pfx.LastMethodSuccess = False) Then
    Debug.WriteLine(pfx.LastErrorText)
    Exit Sub
End If


' Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
Dim rsa As New Chilkat.Rsa
success = rsa.ImportPrivateKeyObj(privKey)
If (success = False) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If



' PKCS-v1_5 is used by default.
rsa.EncodingMode = "hex"
rsa.Charset = "utf-8"
Dim hexSig As String = rsa.SignStringENC(concatenatedParams,"sha256")

Debug.WriteLine("Signature value result is: " & hexSig)

' Compute the MD5 hash of the bytes.
Dim crypt As New Chilkat.Crypt2
crypt.EncodingMode = "hex"
crypt.HashAlgorithm = "md5"
Dim bd As New Chilkat.BinData
bd.AppendEncoded(hexSig,"hex")
Dim md5_summary As String = crypt.HashBdENC(bd)

Debug.WriteLine("MD5 summary value is: " & md5_summary)