About

This tool is an extension around SignTool to call into Azure Key Vault for the signing.

Set up

You will need several things to develop/debug this.

You need an azure key vault and a client id/secret for a credential that can access it. Directions to set that up are here https://github.com/onovotny/RSAKeyVaultProvider, along with a link to a GUI tool for Key Vault that makes it easy to upload a code signing certificate
You’ll need to set KeyVaultSigner as the startup project and use the following command line arguments (certain params are sensitive, so don’t check it in...it would be in the .user file that's ignored!)

sign "C:\dev\signtest\signed\winqual.exe" "C:\Program Files (x86)\Windows Kits\10\bin\10.0.15063.0\x64\SignTool.exe" "sign /tr http://timestamp.digicert.com /fd sha256 /td sha256" -kvu https://<keyVaultname>.vault.azure.net/ -kvc <key vault certificate name> -kvi <client id> -kvs <client secret>
- Make sure you update the the winqual.exe parameter. Choose some unsigned dll that you’ll have signed
Install the child process debugging tool (needed to follow the flow): https://marketplace.visualstudio.com/items?itemName=GreggMiskelly.MicrosoftChildProcessDebuggingPowerTool

The KeyVaultSigner project is the startup project, because it can start the required mixed-mode debugging (native + managed).