C++

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. C++

#include <CkXmlDSig.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkXmlDSig dsig;
    success = dsig.LoadSignature("XML xml signature goes here...");

    //  A sample SAML signature is shown below..

    int numSignatures = dsig.get_NumSignatures();
    int i = 0;
    while (i < numSignatures) {
        dsig.put_Selector(i);

        bool bVerifyRefDigests = false;
        bool bSignatureVerified = dsig.VerifySignature(bVerifyRefDigests);
        if (bSignatureVerified == true) {
            std::cout << "Signature " << (i + 1) << " verified" << "\r\n";
        }
        else {
            std::cout << "Signature " << (i + 1) << " invalid" << "\r\n";
        }

        //  Check each of the reference digests separately..
        int numRefDigests = dsig.get_NumReferences();
        int j = 0;
        while (j < numRefDigests) {
            bool bDigestVerified = dsig.VerifyReferenceDigest(j);
            std::cout << "reference digest " << (j + 1) << " verified = " << bDigestVerified << "\r\n";
            if (bDigestVerified == false) {
                std::cout << "    reference digest fail reason: " << dsig.get_RefFailReason() << "\r\n";
            }

            j = j + 1;
        }

        i = i + 1;
    }

    //  --------------------------------------
    //  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>
    }