XML Digital Signature Verification RSA-SHA256

saikop

I am trying to implement XML digital signature verification inside a Qt application, but i am not able to find a solution for it. Does Qt has inbuilt libraries for this purpose?(I tried but not able to find anything that is useful for the purpose like QSslSocket, QSslKey, QSslCertificate, etc.).

I also tried to use other external libraries like xmlsec but I don't know how exactly to use it. Could some one please guide me in this?

The XML file looks something like this:

<UAPermission lastUpdated="" permissionArtifactId="" ttl="" txnId=""><Permission><Owner operatorId=""><Pilot uaplNo="" validTo=""/></Owner><FlightDetails><UADetails uinNo="Dx0001"/><FlightPurpose frequency="" shortDesc="Provisional test"/><PayloadDetails payloadDetails="Not specified" payloadWeight="Not specified"/><FlightParameters flightEndTime="2020-10-13T21:57:38.869657+05:30" flightStartTime="2020-10-13T20:57:38.869657+05:30" frequenciesUsed=""><Coordinates><Coordinate latitude="12.934158" longitude="77.609316"/><Coordinate latitude="12.934796" longitude="77.609852"/><Coordinate latitude="12.934183" longitude="77.610646"/><Coordinate latitude="12.933551" longitude="77.6101"/><Coordinate latitude="12.934158" longitude="77.609316"/></Coordinates></FlightParameters></FlightDetails></Permission><Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/2006/12/xml-c14n11"/><SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><Reference URI=""><Transforms><Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><Transform Algorithm="http://www.w3.org/2006/12/xml-c14n11"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><DigestValue>3AA68X5DBRYsDoA5GkoycYvABXEQO+udWnvWQ=</DigestValue></Reference></SignedInfo><SignatureValue>SInWyV9Tnw1Pl71/1GT6VR20wQ2mOJvpnnqRbU8Z6HmXV5tkCmm9R5hbJJmi+3jss+LvGc84IH7cI7DJjnqfgH75F0jDRBMza8s2oR+fO15BV/L5bTgZtLi2UfmbFOf2LEe+gRfj/nO1uRzckfcvr7xzqpn5jVhfTDE7embs45330xlmGFd9uOx0ZrjXeaT+s7+Ju5YdWNzFi/D+r0VKAo4ssMjAx0Tz5y/v4MlnDMg/htuP27XR8ilXZzoiE6QgmQO/431TUYj3ro0gmziH8v5Aav3nhec525mSQP+IUBvMamgH8Q4I8J2+UOKt7Ct/beMOHg4zvUgg==</SignatureValue><KeyInfo><X509Data><X509Certificate>MIIC8TCCAdmgAwIBAgIJAJRDnqfLydHvMA0GCSqGSIb3DQEBCwUAMA8xDTALBgNV
BAMMBHRlc3QwHhcNMTkwMzI2MDcxMTQzWhcNMjkwMzIzMDcxMTQzWjAPMQ0wCwYD
VQQDDAR0ZXN0MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq51cjR/m
cgd0nWO33O3SM84yu3DRdaG8OMYSqzPixY5R+D8niOTVLZvOtaFROSneP1JmUAca
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tN8PbMf8wY40OqdgNmgaVmMR4mfAO2XJiryR5Y8JACDGf3dhmcDrdtfmNjaHR109
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/zANBgkqhkiG9w0BAQsFAAOCAQEAV3uurlHMtyopefBpdGj59eLWCrpRYJLKbDtL
FCj+tY1/uiwogUMNsEEHEBeEdwM+PIPuzWZ4tSYQ+SvdCCt4/6e9x+c2/1mZKhnR
zL/s9o70RyWZXQO+Dz43B5aIIy/qARUhLxU2NVL42q90pInIh/ltT02IVkcibwDn
sM4XJhsSyvQlRyYXdPzDeBjEOVYFpafLbC/7a5FBuNwfNKEMWhOj6AELnC8fWb3m
aNevhjSH5amGU2XrUp6yIdWUL2HuW7ReSer93Lg6iYbQsC+r2kH
pNcpntHJLsd9E1cwzWCJiEM9zK4GXqKV/QDUdPC6FYfEf+ti9A==
</X509Certificate></X509Data></KeyInfo></Signature></UAPermission>

Christian Ehrlicher

No, Qt has no support for such kind of things.

Pablo J. Rogina

@saikop said in XML Digital Signature Verification RSA-SHA256:

I also tried to use other external libraries like xmlsec

What have you attempted so far with such library and Qt?

Have you checked the documentation about using external libraries with Qt?

plaristote

I stumbled upon this topic while looking for a similar solution. Since it didn't exist, we created it:

https://github.com/planed-es/QXmlSec

It uses xmlsec-openssl to verify or generate XML digital signature using QSslKey (and we also have our own types, as QSslKey doesn't support all the formats supported by xmlsec) and QDomDocument. I sure hope this will be helpful for other developers !