(VB.NET) Duplicate Java Secure Token Creation

Demonstrates how to duplicate some Java code that creates an RSA signature to create a base64 token.

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

' This example duplicates the following Java code:


' public X509Certificate2 cert = new X509Certificate2(@"Some path to p12/p12file_name.p12","Password_for_p12"); 
' 
' public string GenerateSignToken(double timeValidityMin){ 
'   string equalsSign = ":="; 
'   string timeCreated = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffzzz"); 
'   string tokenTimeInfo = "validityTimeMinutes" + equalsSign + timeValidityMin + ";"+"timeCreated" + equalsSign + timeCreated; 
'   string signature = SignData(tokenTimeInfo); 
'   string secureToken = tokenTimeInfo + ";" + "signature" + equalsSign + signature; 
'   return Base64UrlEncode(secureToken); 
' } 
'  
' public string SignData(string stringToSign){ 
'   byte[] dataToSign = Encoding.UTF8.GetBytes(stringToSign); 
'   RSACryptoServiceProvider privKey = (RSACryptoServiceProvider)cert.PrivateKey; 
'   CspKeyContainerInfo containerInfo = new RSACryptoServiceProvider().CspKeyContainerInfo; 
'   CspParameters cspparams = new CspParameters(containerInfo.ProviderType, containerInfo.ProviderName, privKey.CspKeyContainerInfo.KeyContainerName); 
'   privKey = new RSACryptoServiceProvider(cspparams); 
'   string id = CryptoConfig.MapNameToOID("SHA256"); 
'   byte[] sign = privKey.SignData(dataToSign, id); 
'   bool res = privKey.VerifyData(dataToSign, id, sign); 
'   return Convert.ToBase64String(sign).Replace('+', '-').Replace('/', '_').Replace("=", ""); 
' } 
'  
' private static string Base64UrlEncode(string input){ 
'   var inputBytes = Encoding.UTF8.GetBytes(input); 
'   return Convert.ToBase64String(inputBytes).Replace('+', '-').Replace('/', '_').Replace("=", ""); 
' } 

Dim success As Boolean

Dim dt As New Chilkat.CkDateTime
dt.SetFromCurrentSystemTime()
Dim timeCreated As String = dt.GetAsTimestamp(True)

' Such as 2019-04-01T19:35:44-05:00
Debug.WriteLine(timeCreated)

Dim sbToken As New Chilkat.StringBuilder
sbToken.Append("validityTimeMinutes:=10.0;timeCreated:=")
sbToken.Append(timeCreated)


Dim cert As New Chilkat.Cert
success = cert.LoadPfxFile("Some path to p12/p12file_name.p12","Password_for_p12")
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim rsa As New Chilkat.Rsa
success = rsa.SetX509Cert(cert,True)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


rsa.EncodingMode = "base64url"

Dim signature As String = rsa.SignStringENC(sbToken.GetAsString(),"sha256")
If (rsa.LastMethodSuccess = False) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


sbToken.Append(";signature:=")
sbToken.Append(signature)

' Base64URL encode the result
sbToken.Encode("base64url","utf-8")
Dim token As String = sbToken.GetAsString()

Debug.WriteLine(token)