AutoIt

RSA Sign with PKCS8 Encrypted Key

See more RSA Examples

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). AutoIt

Local $bSuccess = False

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

$oPrivKey = ObjCreate("Chilkat.PrivateKey")

; Load the private key from an RSA PEM file:
$bSuccess = $oPrivKey.LoadAnyFormatFile("raul_privateKey.key","a0123456789")
If ($bSuccess = False) Then
    ConsoleWrite($oPrivKey.LastErrorText & @CRLF)
    Exit
EndIf

$oRsa = ObjCreate("Chilkat.Rsa")

; Import the private key into the RSA component:
$bSuccess = $oRsa.UsePrivateKey($oPrivKey)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

; This example will sign a string, and receive the signature
; in a hex-encoded string.  Therefore, set the encoding mode
; to "hex":
$oRsa.EncodingMode = "hex"

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

; Sign the string using the sha256 hash algorithm.
; Other valid choices are sha1, sha384, sha512 and others.
Local $sHexSig = $oRsa.SignStringENC($strData,"sha256")
If ($oRsa.LastMethodSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($sHexSig & @CRLF)

; Now verify with the public key.
; This example shows how to use the public key from 
; a digital certificate (.cer file)
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromFile("raul_publicKey.cer")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

$oPubKey = ObjCreate("Chilkat.PublicKey")
$oCert.GetPublicKey($oPubKey)

$oRsa2 = ObjCreate("Chilkat.Rsa")
$bSuccess = $oRsa2.UsePublicKey($oPubKey)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa2.LastErrorText & @CRLF)
    Exit
EndIf

; Verify the signature against the original data:
$oRsa2.EncodingMode = "hex"
$bSuccess = $oRsa2.VerifyStringENC($strData,"sha256",$sHexSig)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa2.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Signature verified!" & @CRLF)

; Verify with incorrect data:
$bSuccess = $oRsa2.VerifyStringENC("something else","sha256",$sHexSig)
If ($bSuccess <> True) Then
    ConsoleWrite("Signature not verified! (which was expected in this case)" & @CRLF)
Else
    ConsoleWrite("Hmmm... that's not right..." & @CRLF)
EndIf