(AutoIt) RSA Encrypt String to Encoded Result and Reverse

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Demonstrates how to RSA encrypt a string to a base64 encoded result, and the reverse.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

; The RSA public key is used for encryption, and the private key for decryption.

; The public key's role is to make encryption accessible to anyone while ensuring that
; only the private key holder can decrypt the messages.
; The public key is designed to be widely distributed so anyone can use it to encrypt messages
; intended for the owner of the private key.

; Load our 2048-bit RSA public key.
$oPubKey = ObjCreate("Chilkat.PublicKey")
; In all Chilkat methods expecting a path, you pass either absolute or relative paths.
Local $bSuccess = $oPubKey.LoadFromFile("rsaKeys/myTestRsaPublic.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

$oRsa = ObjCreate("Chilkat.Rsa")

; Tell RSA to use the public key.
$oRsa.ImportPublicKeyObj($oPubKey)

; RSA encryption is for small amounts of data, on the order of 200 bytes or less.
; The maximum number of bytes that can be RSA encrypted depends
; on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding).
; For specific limits, see: RSA Encryption Maximum Number of Bytes

; Encrypt the utf-8 byte representation of the string.
$oRsa.Charset = "utf-8"
$oRsa.EncodingMode = "base64"

; Be Careful when Using non-us-ascii String Literals in Source Code
Local $sEncryptedB64 = $oRsa.EncryptStringENC("Élève français dîne à côté d’un café où l’on sert déjà du gâteau au chocolat et des éclairs délicieux",False)

; ------------------------------------------------------------------------------------------------------------------------
; Let's decrypt, which requires the matching private key...

; Load the matching 2048-bit RSA private key.
$oPrivKey = ObjCreate("Chilkat.PrivateKey")
Local $sPassword = "secret"
$bSuccess = $oPrivKey.LoadAnyFormatFile("rsaKeys/myTestRsaPrivate.pem",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

; Tell the RSA object to use the private key.
$oRsa.ImportPrivateKeyObj($oPrivKey)

; Indicate that after decrypting the resultant decrypted bytes contains the utf-8 byte representation of the text.
$oRsa.Charset = "utf-8"
$oRsa.EncodingMode = "base64"
Local $sOriginalText = $oRsa.DecryptStringENC($sEncryptedB64,True)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Original text = " & $sOriginalText & @CRLF)
ConsoleWrite("Success." & @CRLF)