Day 3: Fixing DS322 Digest Mismatch in IRB Signature #ds322 #xmlcanonicalization

SEO Title: Day 3: Fixing DS322 Digest Mismatch in IRB Signature #ds322 #xmlcanonicalization
Focus Keyphrase: IRB digest mismatch error
Meta Description: Learn how to fix the IRB DS322 digest mismatch error during XML signing. Use proper canonicalization and transform rules in your digital signature block.

Table of Contents

Error DS322: Digest Mismatch Detected

When submitting your digitally signed UBL XML to IRBM, you may get this frustrating error:


"DS322: Digest mismatch - Signature DigestValue does not match calculated value."

What This Error Means

This means:

Your digital signature was created
IRBM tried to re-calculate the digest hash from the XML reference node
The result didn’t match what you signed — so they rejected it

Root Causes

❌ Canonicalization (C14N) not applied or mismatched
❌ Transform (enveloped-signature) not declared
❌ You removed or retained wrong elements during digesting

Correct Laravel Setup with xmlseclibs


$objDSig = new XMLSecurityDSig();
$objDSig->setCanonicalMethod(XMLSecurityDSig::EXC_C14N);

$objDSig->addReference(
    $doc,
    XMLSecurityDSig::SHA256,
    ['http://www.w3.org/2000/09/xmldsig#enveloped-signature'],
    ['uri' => '', 'id_name' => null, 'overwrite' => false]
);

What to Double Check

✅ Canonical method is exclusive C14N
✅ Reference URI is empty (uri: '')
✅ ds:SignedInfo and ds:Reference include the transform
✅ You signed the whole <Invoice> element, including UBLExtensions

Debug Tip

Log these in your Laravel app:


$canonicalXml = $objDSig->canonicalizeData($doc->documentElement);
$debugDigest = base64_encode(hash('sha256', $canonicalXml, true));
Log::debug('Canonical SHA256 for Invoice:', ['digest' => $debugDigest]);

Common Mistake

Trying to sign only the inner content — IRBM expects the full “ document (with namespaces intact), not just your invoice line or monetary totals.

Coming Up in Day 4

We’ll address namespace issues: “Element not bound to namespace” or “Missing cbc/cac/ubl extensions”.

Tags: #IRBIntegration #DigestMismatch #DS322 #UBLSignature #LaravelXML

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