AutoIt

Verify HMAC XML Digital Signature

See more XML Digital Signatures Examples

Demonstrates how to validate an XML digital signature signed with an HMAC key. AutoIt

Local $bSuccess = False

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

; The XML containing the Signature to be verified contains the following:

; <?xml version="1.0" encoding="UTF-8" standalone="no"?>
; <collection Id="root">
; 	<album>
; 		<title>Questions, unanswered</title>
; 		<artist>Steve and the flubberblubs</artist>
; 		<year>1989</year>
; 		<t:tracks xmlns:t="http://test.xades4j/tracks">
; 			<t:song length="4:05" tracknumber="1">
; 				<t:title>What do you know?</t:title>
; 				<t:artist>Steve and the flubberblubs</t:artist>
; 				<t:lastplayed>2006-10-17-08:31</t:lastplayed>
; 			</t:song>
; 			<t:song length="3:45" tracknumber="2">
; 				<t:title>Who do you know?</t:title>
; 				<t:artist>Steve and the flubberblubs</t:artist>
; 				<t:lastplayed>2006-10-17-08:35</t:lastplayed>
; 			</t:song>
; 			<t:song length="5:14" tracknumber="3">
; 				<t:title>When do you know?</t:title>
; 				<t:artist>Steve and the flubberblubs</t:artist>
; 				<t:lastplayed>2006-10-17-08:39</t:lastplayed>
; 			</t:song>
; 			<t:song length="4:19" tracknumber="4">
; 				<t:title>Do you know?</t:title>
; 				<t:artist>Steve and the flubberblubs</t:artist>
; 				<t:lastplayed>2006-10-17-08:44</t:lastplayed>
; 			</t:song>
; 		</t:tracks>
; 	</album>
; <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/><ds:Reference URI="#root"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>rD/g8soqKz8EiPUBhEWfcQacS0ta4ULHX3dKMEH6ZoQ=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>R8dXP95VRYJBfL6d0Peogybdk27+R+JIfX8jnVu0NOI=</ds:SignatureValue></ds:Signature></collection>

; The above XML is available at https://www.chilkatsoft.com/exampleData/hmacSigned.xml
; First fetch the XML..

Local $sUrl = "https://www.chilkatsoft.com/exampleData/hmacSigned.xml"
$oHttp = ObjCreate("Chilkat.Http")
$oSbXml = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oHttp.QuickGetSb($sUrl,$oSbXml)
If ($bSuccess <> True) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

$oVerifier = ObjCreate("Chilkat.XmlDSig")

; Load the XML containing the signature to be verified.
$bSuccess = $oVerifier.LoadSignatureSb($oSbXml)
If ($bSuccess <> True) Then
    ConsoleWrite($oVerifier.LastErrorText & @CRLF)
    Exit
EndIf

; Provide the HMAC key
; The HMAC key for this signature is the us-ascii bytes of the string "secret",
; It can be set in any of the following ways (and also more ways not shown here..)
$oVerifier.SetHmacKey("secret","ascii")
; or
$oVerifier.SetHmacKey("c2VjcmV0","base64")
; or
$oVerifier.SetHmacKey("736563726574","hex")

; Verify the signature
Local $bVerified = $oVerifier.VerifySignature(True)
ConsoleWrite("Signature verified = " & $bVerified & @CRLF)