(Visual FoxPro) 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.

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LOCAL loDsig
LOCAL lnSuccess
LOCAL lnNumSignatures
LOCAL i
LOCAL lnBVerifyRefDigests
LOCAL lnBSignatureVerified
LOCAL lnNumRefDigests
LOCAL j
LOCAL lnBDigestVerified

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.XmlDSig')
loDsig = CreateObject('Chilkat.XmlDSig')
lnSuccess = loDsig.LoadSignature("XML xml signature goes here...")

* A sample SAML signature is shown below..

lnNumSignatures = loDsig.NumSignatures
i = 0
DO WHILE i < lnNumSignatures
    loDsig.Selector = i

    lnBVerifyRefDigests = 0
    lnBSignatureVerified = loDsig.VerifySignature(lnBVerifyRefDigests)
    IF (lnBSignatureVerified = 1) THEN
        ? "Signature " + STR(i + 1) + " verified"
    ELSE
        ? "Signature " + STR(i + 1) + " invalid"
    ENDIF

    * Check each of the reference digests separately..
    lnNumRefDigests = loDsig.NumReferences
    j = 0
    DO WHILE j < lnNumRefDigests
        lnBDigestVerified = loDsig.VerifyReferenceDigest(j)
        ? "reference digest " + STR(j + 1) + " verified = " + STR(lnBDigestVerified)
        IF (lnBDigestVerified = 0) THEN
            ? "    reference digest fail reason: " + STR(loDsig.RefFailReason)
        ENDIF

        j = j + 1
    ENDDO

    i = i + 1
ENDDO

* --------------------------------------
* 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>

RELEASE loDsig