The latest version 1607 of Windows 10, also known as the Anniversary Update comes with some specific driver signing changes. Beginning with the release of Windows 10 Anniversary Update, all new kernel mode drivers must be digitally signed by and submitted to the Windows Hardware Developer Center Dashboard portal.
Driver Signing Changes in Windows 10
Starting with new installations of Windows 10, version 1607, the previously defined driver signing rules will be enforced by the Operating System, and Windows 10, version 1607 will not load any new kernel mode drivers which are not signed by the Dev Portal. OS signing enforcement is only for new OS installations; systems upgraded from an earlier OS to Windows 10, version 1607 will not be affected by this change.
The latest version of Windows 10 will load only Kernel mode drivers signed digitally by the Dev Portal. However, the changes will affect only the new installations of the operating system with Secure Boot on. The non-upgraded fresh installations would require drivers signed by Microsoft.
Please note, that you will not need to re-sign the existing drivers on your Windows 10 PC, to get them work on your upgraded version 1607 of Windows 10. The drivers which are issued before July 29, 2016, and are signed by some valid signing certificate will continue to work on the Windows 10, version 1607.
The new signing policy, however, includes many exceptions and the major ones are:
- PCs upgraded to Windows 10 Build 1607 from a previous version of Windows (for instance Windows 10 version 1511) are not affected by the change.
- PCs without Secure Boot functionality, or Secure Boot off, are not affected either.
- All drivers signed with cross-signing certificates that were issued prior to July 29, 2015, will continue to work.
- Boot drivers won’t be blocked to prevent systems from failing to boot. They will be removed by the Program Compatibility Assistant, however.
- The change affects only Windows 10 Version 1607. All previous versions of Windows are not affected.
The signing changes described by Microsoft are applicable only on the version 1607 of Windows 10. Please note that the new submissions signed with an EV Code Signing Certificate are required for the Windows Hardware Developer Center Dashboard portal, regardless of which operating system you have.
As mentioned earlier the policy changes are applicable only if the Secure Boot is ON, if not, the drivers signed with existing cross-signed certificate will work.
If you are looking some way to sign a driver compatible with all version of Windows, you first need to run the HLK tests for the latest Windows 10 and the HCK tests for Windows 8.1 and all other older versions. All you have to do is to merge the two logs and submit the merged results of HLG and HCK tests along with the driver. You need to submit it to the Windows Hardware Developer Center Dashboard portal.
Visit MSDN to learn more about the Driver Signing changes.