(AutoIt) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1Padding

Demonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context.

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

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

$oRsa = ObjCreate("Chilkat.Rsa")

; First load a public key object with a public key.
; In this case, we'll load it from a file.
$oPubkey = ObjCreate("Chilkat.PublicKey")
Local $bSuccess = $oPubkey.LoadFromFile("qa_data/pem/rsa_public.pem")
If ($bSuccess <> True) Then
    ConsoleWrite($oPubkey.LastErrorText & @CRLF)
    Exit
EndIf

; RSA encryption is limited to small amounts of data. The limit
; is typically a few hundred bytes and is based on the key size and
; padding (OAEP vs. PKCS1_5).  RSA encryption is typically used for
; encrypting hashes or symmetric (bulk encryption algorithm) secret keys.
Local $sPlainText = "Time is an illusion. Lunchtime doubly so."

; Import the public key to be used for encrypting.
$bSuccess = $oRsa.ImportPublicKeyObj($oPubkey)

; To get OAEP padding, set the OaepPadding property:
$oRsa.OaepPadding = True

; To use SHA1 or SHA-256, set the OaepHash property
$oRsa.OaepHash = "sha256"
; for SHA1 --
$oRsa.OaepHash = "sha1"

; Indicate we'll want hex output
$oRsa.EncodingMode = "hex"

; Encrypt..
Local $bUsePrivateKey = False
Local $sEncryptedStr = $oRsa.EncryptStringENC($sPlainText,$bUsePrivateKey)
ConsoleWrite($sEncryptedStr & @CRLF)

; -------------------------------------------------
; Now decrypt with the matching private key.
$oRsa2 = ObjCreate("Chilkat.Rsa")

$oPrivKey = ObjCreate("Chilkat.PrivateKey")
$bSuccess = $oPrivKey.LoadEncryptedPem("qa_data/pem/rsa_passwd.pem","passwd")
If ($bSuccess <> True) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oRsa2.ImportPrivateKeyObj($oPrivKey)

; Make sure we have the same settings used for encryption.
$oRsa2.OaepPadding = True
$oRsa2.EncodingMode = "hex"
$oRsa2.OaepHash = "sha1"

Local $sOriginalStr = $oRsa2.DecryptStringENC($sEncryptedStr,True)

ConsoleWrite($sOriginalStr & @CRLF)