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Create JWS Using Private Key on a Smart Card

See more JSON Web Signatures (JWS) Examples

Creates and validates a JSON Web Signature (JWS) using the private key associated with a certificate on a smart card. AutoIt

Local $bSuccess = False

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

; Load the certificate from a smart card.
$oCert = ObjCreate("Chilkat.Cert")

; Set the smarcard PIN prior to loading
$oCert.SmartCardPin = "123456"

; Detect the connected smartcard or USB security token and load the default certificate.
$bSuccess = $oCert.LoadFromSmartcard("")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Note: Chilkat provides many different ways to load a certificate from a smartcard or USB token,
; such as selecting a certificate if the card contains multiple certificates with private keys,
; or working with lower-level PKCS11 or ScMinidriver API's (both of which Chilkat provides).

; Create the JWS Protected Header
$oJwsProtHdr = ObjCreate("Chilkat.JsonObject")

If ($oCert.IsEcdsa() = True) Then
    $oJwsProtHdr.AppendString("alg","ES256")
Else
    $oJwsProtHdr.AppendString("alg","RS256")
EndIf

$oJws = ObjCreate("Chilkat.Jws")

; Set the protected header:
Local $iSignatureIndex = 0
$oJws.SetProtectedHeader($iSignatureIndex,$oJwsProtHdr)

; Provide the private key via the certificate.
; This requires Chilkat v11.5.0 or greater.
$oJws.SetSigningCert($iSignatureIndex,$oCert)

; Set the payload.
Local $bIncludeBom = False
Local $sPayloadStr = "In our village, folks say God crumbles up the old moon into stars."
$oJws.SetPayload($sPayloadStr,"utf-8",$bIncludeBom)

; Create the JWS
; By default, the compact serialization is used.
Local $sJwsCompact = $oJws.CreateJws()
If ($oJws.LastMethodSuccess = False) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("JWS: " & $sJwsCompact & @CRLF)

; sample output:
; JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ

; Now load the JWS, validate, and recover the original text.
$oJws2 = ObjCreate("Chilkat.Jws")

; Load the JWS.
$bSuccess = $oJws2.LoadJws($sJwsCompact)

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

; Set the public key used for validation.
$iSignatureIndex = 0
$oJws2.SetPublicKey($iSignatureIndex,$oPubKey)

; Validate the 1st (and only) signature at index 0..
Local $iV = $oJws2.Validate($iSignatureIndex)
If ($iV < 0) Then
    ; Perhaps Chilkat was not unlocked or the trial expired..
    ConsoleWrite("Method call failed for some other reason." & @CRLF)
    ConsoleWrite($oJws2.LastErrorText & @CRLF)
    Exit
EndIf

If ($iV = 0) Then
    ConsoleWrite("Invalid signature.  The key was incorrect, the JWS was invalid, or both." & @CRLF)
    Exit
EndIf

; If we get here, the signature was validated..
ConsoleWrite("Signature validated." & @CRLF)

; Recover the original content:
ConsoleWrite($oJws2.GetPayload("utf-8") & @CRLF)

; Examine the protected header:

$oJoseHeader = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJws2.GetProtectedH($iSignatureIndex,$oJoseHeader)
If ($bSuccess = False) Then
    ConsoleWrite($oJws2.LastErrorText & @CRLF)
    Exit
EndIf

$oJoseHeader.EmitCompact = False

ConsoleWrite("Protected (JOSE) header:" & @CRLF)
ConsoleWrite($oJoseHeader.Emit() & @CRLF)

; Output:

; 	Signature validated.
; 	In our village, folks say God crumbles up the old moon into stars.
; 	Protected (JOSE) header:
; 	{ 
; 	  "alg": "RS256"
; 	}