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Generate RSA Key and Sign a String

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Demonstrates how to generate a new RSA public/private key pair and use it to generate a signature for a string. The (binary) digital signature is returned as a hexidecimalized string. AutoIt

Local $bSuccess = False

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

$oRsa = ObjCreate("Chilkat.Rsa")

; Generate a 2048-bit RSA key.
$oPrivKey = ObjCreate("Chilkat.PrivateKey")
$bSuccess = $oRsa.GenKey(2048,$oPrivKey)

$oRsa.UsePrivateKey($oPrivKey)

; Return the signature in hex.
$oRsa.EncodingMode = "hex"

Local $strData = "This is the string to be signed."

; Sign the SHA256 hash of the string.
Local $sHexSig = $oRsa.SignStringENC($strData,"sha256")

ConsoleWrite($sHexSig & @CRLF)

; Now verify the signature:
$oPubKey = ObjCreate("Chilkat.PublicKey")
$oPrivKey.ToPublicKey($oPubKey)
$oRsa.UsePublicKey($oPubKey)

$bSuccess = $oRsa.VerifyStringENC($strData,"sha256",$sHexSig)
If ($bSuccess = True) Then
    ConsoleWrite("Signature verified!" & @CRLF)
Else
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
EndIf

; Try it with an invalid signature:
$bSuccess = $oRsa.VerifyStringENC($strData,"sha256","not a valid sig")
If ($bSuccess = True) Then
    ConsoleWrite("Signature verified!" & @CRLF)
Else
    ConsoleWrite("Signature validation failed!" & @CRLF)
EndIf

; Try it with invalid data:
$bSuccess = $oRsa.VerifyStringENC("Not the original data","sha256",$sHexSig)
If ($bSuccess = True) Then
    ConsoleWrite("Signature verified!" & @CRLF)
Else
    ConsoleWrite("Signature validation failed!" & @CRLF)
EndIf