Support modern signing algorithms like sha256ECDSA

[denisbrodbeck]

Hi,

thank you for this really interesting project. Just stumbled upon it and liking it very much.

I'm trying to build and sign some custom apps using a self-generated code signing certifacte, which uses sha256ECDSA instead of rsa.

This certificate is signed by our internal intermediate certificate authority and trusted by all active-directory or Azure AD joined devices.
We use this certificate to sign all of our internal company apps (mostly C#-Apps) and IT-related PowerShell-Scripts. This works flawlessly on our Win10 and Win11 clients.

Here's how we sign our regular files:

$cert=Get-ChildItem -Path Cert:\CurrentUser\My -CodeSigningCert
$TimeStampingAuthority = 'http://timestamp.digicert.com'

Set-AuthenticodeSignature -Certificate $cert -TimestampServer $TimeStampingAuthority -FilePath .\*.dll
Set-AuthenticodeSignature -Certificate $cert -TimestampServer $TimeStampingAuthority -FilePath .\*.exe
Set-AuthenticodeSignature -Certificate $cert -TimestampServer $TimeStampingAuthority -FilePath .\*.ps1

Set-AuthenticodeSignature doesn't work on .msix files, so I used signtool.exe, which works fine so far, but I couldn't get it to work with my code signing cert stored in personal policy store. The only way I could sign is by using a .pfx and passing the password via command line (which might get exposed via shell history):

MakeAppx pack /v /h SHA256 /d "..\app1\" /p app1.msix
SignTool sign /debug /fd sha256 /a /f code_signing.p12 /p "<loooongpassword>" app1.msix

Using these commands gets me a fully signed msix, which can be installed on our clients without issues -- all cert validation by windows is okay (because IT deployed the correct root and intermediate certs on the clients).

Is there a specific reason, why ecdsa-based certificates are generally not supported by MSIX-Hero? Even when the current signtool has no issues with such certs?

I'm a long time C#-Dev myself and are willing to contribute a PR+tests.

Thank your for this project, again. The app looks very polished and the code looks the same 🙃

Greetings
Denis from Stuttgart