(AutoIt) Convert RSA Private Key to Public Key

Demonstrates how to get a public RSA key from a private RSA key.

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

$oKey = ObjCreate("Chilkat.PrivateKey")

; Step 1: Load the private key from a source.
; (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
; see the online reference documentation for more options.)
Local $bSuccess = $oKey.LoadPemFile("qa_data/pem/VP_Private.pem")
If ($bSuccess <> True) Then
    ConsoleWrite($oKey.LastErrorText & @CRLF)
    Exit
EndIf

; Step 2: Get the public key object from the private key object.
Local $oPubKey = $oKey.GetPublicKey()
If ($oKey.LastMethodSuccess <> True) Then
    ConsoleWrite($oKey.LastErrorText & @CRLF)
    Exit
EndIf

; Step 3: Save the public key in a desired format. 
; (Chilkat can load or save public and private keys in many different formats.  See
; the online reference documentation for more options.)

; Saves to a PKCS8 PEM file.
Local $bPreferPkcs1 = False
$bSuccess = $oPubKey.SavePemFile($bPreferPkcs1,"qa_data/pem/VP_Public.pem")
If ($oPubKey.LastMethodSuccess <> True) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Extracted and saved public key from private key." & @CRLF)