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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Out of curiosity, if the signature verification failed, how do you know whether the signature isn't valid for the digest, or the digest doesn't match the document?</p> <p style="margin: 10px 0 0 0"> </p> <p style="margin: 10px 0 0 0">Here is the debug output which didn't shed much light to me:</p> <p style="margin: 10px 0 0 0"> </p> <p style="margin: 10px 0 0 0">DEBUG XMLSecTool - Creating XML security library XMLSignature object <br> DEBUG XMLSecTool - reference was empty; no ID marking required <br> DEBUG XMLSecTool - checking digest <a href="http://www.w3.org/2001/04/xmlenc#sha256" class="external-link" target="_blank" rel="nofollow noopener" style="color: #3b73af; text-decoration: none">http://www.w3.org/2001/04/xmlenc#sha256</a> allowed <br> DEBUG XMLSecTool - checking signature method <a href="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256" class="external-link" target="_blank" rel="nofollow noopener" style="color: #3b73af; text-decoration: none">http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256</a> is <br> allowed <br> DEBUG XMLSecTool - Verifying XML signature with key <br> MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEwXfiK2ao/T8EDv02rr1a0xZYKkoxv3FGDltKFLsZNIyTUo5RAhFh8RXy8/hqSloz<br> Gfd3pOx/70LeGzbWd/ExQg== <br> DEBUG XMLSignature - signatureMethodURI = <a href="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256" class="external-link" target="_blank" rel="nofollow noopener" style="color: #3b73af; text-decoration: none">http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256</a> <br> DEBUG XMLSignature - jceSigAlgorithm = SHA256withECDSA <br> DEBUG XMLSignature - jceSigProvider = SunEC <br> DEBUG XMLSignature - PublicKey = Sun EC public key, 256 bits <br> public x coord: 87508195542042493938647892682330193200825902673687134498805280568743650997388 <br> public y coord: 66635852433006686269179850672640488119873880379165204339026769314778650325314 <br> parameters: secp256r1 <span class="error">[NIST P-256, X9.62 prime256v1]</span> (1.2.840.10045.3.1.7) <br> DEBUG SignerOutputStream - Canonicalized SignedInfo: <br> DEBUG SignerOutputStream - <ds:SignedInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> <br> <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></ds:Canonicalization<br> Method> <br> <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256"></ds:SignatureMe<br> thod> <br> <ds:Reference URI=""> <br> <ds:Transforms> <br> <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"></ds:Transform> <br> <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></ds:Transform> <br> </ds:Transforms> <br> <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"></ds:DigestMethod> <br> <ds:DigestValue>KU3kfwlD1g5YPScPkeZiyNb2NU9TeJKUTGs7Si3HWrM=</ds:DigestValue> <br> </ds:Reference> <br> </ds:SignedInfo> <br> WARN XMLSignature - Signature verification failed. <br> ERROR XMLSecTool - XML document signature verification failed</p> </td>
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