Windows 10: Signtool Thirdparty Signing of a Sideloaded UWP App

Good morning,


I have a UWP sideloaded app that I have developed for a couple of years now for a client. We have our own code signing certificate that works well, but they want to start using theirs. What we have been trying to do here is package the app without signing and send it to them. When they get the appxbundle/msixbundle on their machine and sign using the SignTool, it has been giving various errors. I can do the same packaging without a certificate and give it to a developer on my team and it they can sign it no problem. We also know the the client's certificate works, because they have currently signed another app. Inside the AppxBundleManifest, we do ensure the publisher matches the subject of their certificate. The latest error was this: error 0x800B0100: The app bundle must be digitally signed for signature validation. The exact parameters we have been using are : sign /fd SHA256 /a /f {cert.pfx} /p {password} {file.appxbundle}.


Any help will greatly be appreciated.

:)

 

0x800700C1 in SignTool

hi

i hvae made a 32 bit game but im having trouble signing the sertificate off the .appx file

this is the error that i get

C:\Program Files (x86)\Windows Kits\10\bin\10.0.17134.0\x86>SignTool sign /fd SHA256 /a /f signingCertx.pfx C:\projectx\snake\PackageFiles\snake.appx

Done Adding Additional Store

SignTool Error: SignedCode::Sign returned error: 0x800700C1

For more information, please see https://aka.ms/badexeformat

SignTool Error: An error occurred while attempting to sign: C:\projectx\snake\PackageFiles\snake.appx

i have used desktop app converter to make the EXE into an APPX

i have done all the steps that has brought me to this code:

SignTool sign /fd SHA256 /a /f signingCertx.pfx C:\projectx\snake\PackageFiles\snake.appx

but im stuck coz all i get is the error mentioned above after i type the code below :

SignTool sign /fd SHA256 /a /f signingCertx.pfx C:\projectx\snake\PackageFiles\snake.appx

my certificate has no password so i didnt include the /p

can you help me please

it would be much apritiated

i run windows pro

i have the windows SDK installed

also i have visual studio 7 that makes it easier

thank you

 

How can I backup and sideload Windows universal apps?

Packaging UWP apps - Windows UWP applications | Microsoft Docs

In the Store select this for each app if all PCs use the same Microsoft account

 

How can i sideload apps on lumia 430

All apps » Settings » Update » For developers » Sideload apps

Works here. All you need is to
download the app to your microSD and install it via the File Explorer. If your app is not correctly signed, you have to go for the ‘Developer mode’ which is the mode ‘Sideload apps’ plus ignoring the code-signature. If that did not address your concern,
please, explain in greater detail which step fails with which app.