(PowerShell) Duplicate Java Secure Token Creation

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

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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("=", ""); 
# } 

$dt = New-Object Chilkat.CkDateTime
$dt.SetFromCurrentSystemTime()
$timeCreated = $dt.GetAsTimestamp($true)

# Such as 2019-04-01T19:35:44-05:00
$($timeCreated)

$sbToken = New-Object Chilkat.StringBuilder
$sbToken.Append("validityTimeMinutes:=10.0;timeCreated:=")
$sbToken.Append($timeCreated)

$cert = New-Object Chilkat.Cert
$success = $cert.LoadPfxFile("Some path to p12/p12file_name.p12","Password_for_p12")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa
$success = $rsa.SetX509Cert($cert,$true)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

$rsa.EncodingMode = "base64url"

$signature = $rsa.SignStringENC($sbToken.GetAsString(),"sha256")
if ($rsa.LastMethodSuccess -eq $false) {
    $($rsa.LastErrorText)
    exit
}

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

# Base64URL encode the result
$sbToken.Encode("base64url","utf-8")
$token = $sbToken.GetAsString()

$($token)