Zig

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. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main() !void {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const dsig = try chilkat.XmlDSig.init();
    defer dsig.deinit();
    try dsig.loadSignature("XML xml signature goes here...");

    // A sample SAML signature is shown below..

    const num_signatures = dsig.getNumSignatures();
    var i: i32 = 0;
    while (i < num_signatures) {
        dsig.setSelector(i);

        const b_verify_ref_digests = false;
        if (dsig.verifySignature(b_verify_ref_digests)) {
            std.debug.print("Signature {d} verified\n", .{i + 1});
        } else |_| {
            std.debug.print("Signature {d} invalid\n", .{i + 1});
        }

        // Check each of the reference digests separately..
        const num_ref_digests = dsig.getNumReferences();
        var j: i32 = 0;
        while (j < num_ref_digests) {
            const b_digest_verified = dsig.verifyReferenceDigest(j);
            std.debug.print("reference digest {d} verified = {}\n", .{ j + 1, b_digest_verified });
            if (!b_digest_verified) {
                std.debug.print("    reference digest fail reason: {d}\n", .{dsig.getRefFailReason()});
            }

            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>
}