I'm trying to create and use a self-signed certificate for code signing, but I'm running into some issues. Here's what I've done so far:
1. I created the certificate using PowerShell:
`$selfsigncert = New-SelfSignedCertificate -Subject "CN=PowerShell Code Signing" -KeyAlgorithm RSA -KeyLength 2048 -Type CodeSigningCert -CertStoreLocation Cert:LocalMachineMy`
2. Then I moved the certificate to the Trusted Root CAs:
`Move-Item "Cert:LocalMachineMy$($selfsigncert.Thumbprint)" Cert:LocalMachineRoot`
3. Finally, I tried to sign my script with this command:
`Set-AuthenticodeSignature .ScriptName.ps1 $selfsignrootcert`
However, I'm getting the following error:
`Set-AuthenticodeSignature: Cannot bind parameter 'Certificate'. Cannot convert value "Cert:LocalMachineRoot[omitted]" to type "System.Security.Cryptography.X509Certificates.X509Certificate2". Error: "The filename, directory name, or volume label syntax is incorrect."`
I've even tried using the full path of the script in quotes, but I keep getting the same error. Any ideas on what I might be doing wrong?
4 Answers
It looks like the problem is that you're trying to pass a string path to the certificate, but you really need to pass the actual certificate object instead. Try this:
1. Retrieve the certificate object:
`$cert = Get-Item -Path "Cert:LocalMachineRoot$($selfsigncert.Thumbprint)"`
2. Then, use that object to sign your script:
`Set-AuthenticodeSignature -FilePath .ScriptName.ps1 -Certificate $cert`
This should fix the error you're facing.
Make sure your certificate still has the private key after moving it to the root store. If you lose the private key, signing won't work, so check its properties to confirm that it’s still attached.
You should create the self-signed certificate directly in the `Cert:LocalMachineMy` store without moving it. So, first create your cert there, then use it directly for signing without the need to move it. Only move it if needed for other purposes, but it's better just to use the original cert for signing.
Remember that installing certificates in a non-private certificate store requires admin permissions. Also, the `Move-Item` cmdlet may not properly support moving certificates between different stores. Consider using `Import-Certificate` instead when you need to add a cert to a different store.
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