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SAML Signature Validation

See more XML Digital Signatures Examples

A SAML Signature is an XML Digital Signature (XMLDSig) just like any other XML digital signature. It can be verified by using Chilkat' XmlDSig class, as shown in this example. AutoIt

Local $bSuccess = False

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

$oDsig = ObjCreate("Chilkat.XmlDSig")
$bSuccess = $oDsig.LoadSignature("XML xml signature goes here...")

; A sample SAML signature is shown below..

Local $iNumSignatures = $oDsig.NumSignatures
Local $i = 0
While $i < $iNumSignatures
    $oDsig.Selector = $i

Local $bVerifyRefDigests = False
Local $bSignatureVerified = $oDsig.VerifySignature($bVerifyRefDigests)
    If ($bSignatureVerified = True) Then
        ConsoleWrite("Signature " & ($i + 1) & " verified" & @CRLF)
    Else
        ConsoleWrite("Signature " & ($i + 1) & " invalid" & @CRLF)
    EndIf

    ; Check each of the reference digests separately..
Local $iNumRefDigests = $oDsig.NumReferences
Local $iJ = 0
    While $iJ < $iNumRefDigests
Local $bDigestVerified = $oDsig.VerifyReferenceDigest($iJ)
        ConsoleWrite("reference digest " & ($iJ + 1) & " verified = " & $bDigestVerified & @CRLF)
        If ($bDigestVerified = False) Then
            ConsoleWrite("    reference digest fail reason: " & $oDsig.RefFailReason & @CRLF)
        EndIf

        $iJ = $iJ + 1
    Wend

    $i = $i + 1
Wend

; --------------------------------------
; Here is a sample SAML XML Signature
; 
; 
; <?xml version="1.0" encoding="UTF-8"?>
; <saml2p:Response xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" ID="abc123" Version="2.0" IssueInstant="2022-04-01T12:34:56Z" Destination="https://sp.example.com/sso">
;   <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">https://idp.example.com</saml2:Issuer>
;   <saml2p:Status>
;     <saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
;   </saml2p:Status>
;   <saml2:Assertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" ID="def456" IssueInstant="2022-04-01T12:34:56Z" Version="2.0">
;     <saml2:Issuer>https://idp.example.com</saml2:Issuer>
;     <saml2:Subject>
;       <saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">user@example.com</saml2:NameID>
;     </saml2:Subject>
;     <saml2:Conditions NotBefore="2022-04-01T12:34:56Z" NotOnOrAfter="2022-04-01T13:34:56Z"/>
;     <saml2:AuthnStatement AuthnInstant="2022-04-01T12:34:56Z">
;       <saml2:AuthnContext>
;         <saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:Password</saml2:AuthnContextClassRef>
;       </saml2:AuthnContext>
;     </saml2:AuthnStatement>
;     <!-- Additional assertion content -->
;   </saml2:Assertion>
;   <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#rsa-sha256"/>
;       <ds:Reference URI="#abc123">
;         <ds:Transforms>
;           <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
;           <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>q7Zj1w+...+pCsjw=</ds:DigestValue>
;       </ds:Reference>
;       <!-- Additional references if present -->
;     </ds:SignedInfo>
;     <ds:SignatureValue>
;       NjIzOWE5ZjA2M2M1...NzUwNzUwNzUwNzUwNzU=
;     </ds:SignatureValue>
;     <ds:KeyInfo>
;       <ds:X509Data>
;         <ds:X509Certificate>
;           MIIDgzCCAmugAwIBAg...AgADAA==
;         </ds:X509Certificate>
;       </ds:X509Data>
;     </ds:KeyInfo>
;   </ds:Signature>
; </saml2p:Response>