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Ideally you would want your company’s name to show up in this dialog box, but I have not done enough research to really know what the requirements are. That is why I put question marks in the "Loading a kernel module" column in the table above entitled "Signature requirements for it to look good". Prior to Windows , you could use a cross-certificate to sign your CAT file and produce a signature that convinces Windows to load your SYS file into the kernel. The main requirement for that signature was just that the signature’s chain of trust must go back to the Microsoft Code Verification Root certificate, or some other certificate that is trusted by the kernel. This is documented very clearly in kmsigning.doc, which explains that the kernel does not have access to the Trusted Root Certification Authorities list. Microsoft publishes a complete list of the Cross-Certificates for Kernel Mode Code Signing.

TRCA In the tables above, TRCA means the signature’s chain of trust must go back to a certificate in the user’s Trusted Root Certification Authorities list. As you can see in certmgr.msc, the TRCA list has certificates from several well-known companies such as a Verisign, Globalsign, Digicert, and Go Daddy. Many certificates are not present in the list initially, but Window will attempt to automatically install them from the various sources when they are needed to verify a signature. To successfully release your software, you should make sure that your digital signature meets all the necessary requirements documented below. The requirements are summarized in the tables below, and then the terms in the tables are defined and explained after the tables. Each data cell of each table contains a boolean expression that combines different requirements using and (&) and or operations.

In fact, the DriverVer version is optional according to that page. You can even reference multiple INF files in the CopyINF directive if you want. For both of these batch files, if you are using a cross-certificate, I recommend just putting the cross-certificate in the same directory as the batch file to make the /ac parameter simpler. Note that there is no way to specify the digest algorithm when running inf2cat; it seems like CAT files always use SHA-1. The digital signature for a kernel module also affects what users see in the Device Manager. Just double-click on a device using the module, select the Details tab, and click Driver details.

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Keep in mind that the table above uses boolean expressions, so when I write "X or Y or Z" it means that if any of those three are true, then your signature will work. One way Windows can download root certificates is by connecting to Windows Update using the Internet. Logically, it shouldn’t work if the computer is disconnected from the internet. In my experience, HP envy 5540 driver even with an internet connection it does not always work reliably. For more information about the portal, see the Loading a kernel module section.

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Alternatively, you could distribute the executable unsigned. When I first wrote this document in 2013, I was convinced that you should use /tr. I was able to reproduce these results in 2015 if I used the exact same file and browser, but I was not able to reproduce them using IE11 or with a newly-signed file on IE10. The results I got earlier might be explained by a subtle bug in the Starfield timestamp server’s implementation of /t, which for some reason was only detected by IE 10. Unsigned This requirement is true if the file simply has no signature.

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I strongly suspect that this list is incomplete, so please post a comment if there is anything to add to it. You can also use a hex editor such as WinHex to examine the embedded signatures; you can easily see the names of the signer and the organizations in the certification path. The same subject can be found in multiple different certificates.

The name in the prompt comes from from the INF file’s DriverPackageDisplayName directive and the publisher comes from the verified signature on the CAT file. Another workaround for the user to do would be to remove the special flag in the file system that marks the file as coming from the internet.

New requirements for protecting private keys using hardware are in section 16.3, and also mentioned in a blog post. The INF DriverVer Directive is documented here on MSDN. If the DriverVer version number were important in some way, that should be documented on that page, not buried on page 11 of kmsigning.doc.

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