Essential PowerShell

Creating a self-signed code signing certificate for testing

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When signing personal scripts or when testing code signing it can be useful to create a self-signed code signing certificate.

Beginning with PowerShell 5.0 you can generate a self-signed code signing certificate by using the New-SelfSignedCertificate-cmdlet: 

New-SelfSignedCertificate -FriendlyName "StackOverflow Example Code Signing" -CertStoreLocation Cert:\CurrentUser\My -Subject "SO User" -Type CodeSigningCert

In earlier versions, you can create a self-signed certificate using the makecert.exe tool found in the .NET Framework SDK and Windows SDK.

A self-signed ceriticate will only be trusted by computers that have installed the certificate. For scripts that will be shared, a certificate from a trusted certificate authority (internal or trusted third-party) are recommended.

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