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Extract SignatureValue from Signed XML
See more XML Digital Signatures Examples
Demonstrates how to extract the signature value from signed XML.Chilkat AutoIt Downloads
Local $bSuccess = False
; This example will work with the following signed XML, which as been reformatted for readability.
; <?xml version="1.0" encoding="utf-8"?>
; <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
; <SOAP-ENV:Header>
; <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1">
; <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#">
; <InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/>
; </ds:CanonicalizationMethod>
; <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
; <ds:Reference URI="#Body">
; <ds:Transforms>
; <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
; </ds:Transforms>
; <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
; <ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue>
; </ds:Reference>
; </ds:SignedInfo>
; <ds:SignatureValue>C+7FWngU....DJFBcdg==</ds:SignatureValue>
; <ds:KeyInfo>
; <ds:KeyValue>
; <ds:RSAKeyValue>
; <ds:Modulus>sXeRhM55P13.....NAcibRw==</ds:Modulus>
; <ds:Exponent>AQAB</ds:Exponent>
; </ds:RSAKeyValue>
; </ds:KeyValue>
; </ds:KeyInfo>
; </ds:Signature>
; </wsse:Security>
; </SOAP-ENV:Header>
; <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
; <z:FooBar xmlns:z="http://example.com"/>
; </SOAP-ENV:Body>
; </SOAP-ENV:Envelope>
; -----------------------------------------------------------------------------------------
; There are a number of ways we can get the contents of the <ds:SignatureValue>...</ds:SignatureValue>
Local $sFilePath = "qa_data/xml_dsig_testing/sample_to_show_how_to_extract_sig.xml"
; If you know there will only be a single SignatureValue in the XML, you don't need to parse XML.
; Just do quick and simple string search..
; For example:
$oSb = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oSb.LoadFile($sFilePath,"utf-8")
If ($bSuccess = False) Then
ConsoleWrite("Failed to load file." & @CRLF)
Exit
EndIf
Local $sBase64Sig = $oSb.GetBetween("SignatureValue>","</")
ConsoleWrite("base64Sig = " & $sBase64Sig & @CRLF)
; -----------------------------------------------------------------------------------------
; If the XML might contain multiple signatures, but the signatures will always be located in the
; same place, then you can (beforehand) copy a sample signed XML into Chilkat's online tool
; at Generate Parsing Code from XML
; to get the path to the SignatureValue. For example, the line of code generated for the SignatureValue
; for the above XML is:
; string ds_SignatureValue = xml.GetChildContent("SOAP-ENV:Header|wsse:Security|ds:Signature|ds:SignatureValue");
; So you can simply use that path..
$oXml = ObjCreate("Chilkat.Xml")
$bSuccess = $oXml.LoadXmlFile($sFilePath)
; Assume success..
$sBase64Sig = $oXml.GetChildContent("SOAP-ENV:Header|wsse:Security|ds:Signature|ds:SignatureValue")
ConsoleWrite("base64Sig = " & $sBase64Sig & @CRLF)
; -----------------------------------------------------------------------------------------
; Or perhaps you don't know where the signature is located in the XML.
; You can search for the tag..
Local $oXSigVal = $oXml.SearchForTag($oXml,"*:SignatureValue")
If ($oXml.LastMethodSuccess = True) Then
ConsoleWrite("base64Sig = " & $oXSigVal.Content & @CRLF)
Else
ConsoleWrite("No SignatureValue found." & @CRLF)
EndIf