(AutoIt) Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

Validates a JSON Web Signature (JWS) that uses RSASSA-PKCS1-v1_5 SHA-256.

Note: This example requires Chilkat v9.5.0.66 or greater.

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

; Note: This example requires Chilkat v9.5.0.66 or greater.

; This example takes a JSON signature in compact serialization format,
; and uses an RSA public key to validate and recover the protected header and payload.

; We only need a public key for signature validation.  This is the RSA public key
; that is used:

;      {"kty":"RSA", 
;       "n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx
;            HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs
;            D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH
;            SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV
;            MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8
;            NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ", 
;       "e":"AQAB"
;      }

$oSbPubKey = ObjCreate("Chilkat.StringBuilder")
$oSbPubKey.Append("{""kty"":""RSA"",")
$oSbPubKey.Append("""n"":""ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
$oSbPubKey.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
$oSbPubKey.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
$oSbPubKey.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
$oSbPubKey.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
$oSbPubKey.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ"",")
$oSbPubKey.Append("""e"":""AQAB""")
$oSbPubKey.Append("}")

$oPubKey = ObjCreate("Chilkat.PublicKey")
Local $bSuccess = $oPubKey.LoadFromString($oSbPubKey.GetAsString())
If ($bSuccess <> True) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

$oJws = ObjCreate("Chilkat.Jws")

; Set the RSA public key:
Local $iSignatureIndex = 0
$oJws.SetPublicKey($iSignatureIndex,$oPubKey)

; Load the JWS.
$oSbJws = ObjCreate("Chilkat.StringBuilder")
$oSbJws.Append("eyJhbGciOiJSUzI1NiJ9")
$oSbJws.Append(".")
$oSbJws.Append("eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt")
$oSbJws.Append("cGxlLmNvbS9pc19yb290Ijp0cnVlfQ")
$oSbJws.Append(".")
$oSbJws.Append("cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7")
$oSbJws.Append("AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4")
$oSbJws.Append("BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K")
$oSbJws.Append("0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv")
$oSbJws.Append("hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB")
$oSbJws.Append("p0igcN_IoypGlUPQGe77Rw")

$bSuccess = $oJws.LoadJwsSb($oSbJws)
If ($bSuccess <> True) Then
    ConsoleWrite($oJws.LastErrorText & @CRLF)
    Exit
EndIf

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

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

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

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

; Examine the protected header:
Local $oJoseHeader = $oJws.GetProtectedHeader($iSignatureIndex)
If ($oJws.LastMethodSuccess <> True) Then
    ConsoleWrite("No protected header found at the given index." & @CRLF)
    Exit
EndIf

$oJoseHeader.EmitCompact = False

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

; Output:

; 	Signature validated.
; 	--
; 	Recovered content:
; 	{"iss":"joe", 
; 	 "exp":1300819380,
; 	 "http://example.com/is_root":true}
; 	--
; 	Protected (JOSE) header:
; 	{ 
; 	  "alg": "RS256"
; 	}