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RSA Sign utf-8 Bytes of String to get Base64 RSA Signature

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Demonstrates how RSA sign the utf-8 byte representation of a string to get the signature in base64 format. AutoIt

Local $bSuccess = False

; Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
; this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

; Chilkat automatically detects and determines the way in which the HSM is used,
; which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

$oCert = ObjCreate("Chilkat.Cert")

; Set the token/smartcard PIN prior to loading.
$oCert.SmartCardPin = "123456"

; Specify the certificate by its common name.
$bSuccess = $oCert.LoadFromSmartcard("cn=chilkat-rsa-2048")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Signing with cert: " & $oCert.SubjectCN & @CRLF)

; Create a string to be hashed and signed.
$oSb = ObjCreate("Chilkat.StringBuilder")
Local $bCrlfLineEnding = True
Local $i
For $i = 0 To 10
    $oSb.AppendLine("This is a test.",$bCrlfLineEnding)
Next

$oRsa = ObjCreate("Chilkat.Rsa")

; Use the certificate's private key for signing.
$bSuccess = $oRsa.SetX509Cert($oCert,True)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

; Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
; Return the signature in base64 format.
$oRsa.EncodingMode = "base64"
$oRsa.Charset = "utf-8"
Local $stringToSign = $oSb.GetAsString()
Local $sigBase64 = $oRsa.SignStringENC($stringToSign,"sha256")
If ($oRsa.LastMethodSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("RSA signature as base64: " & $sigBase64 & @CRLF)