Go Requires Chilkat v11.7.0+

Authenticode Sign a Windows Installer Package (MSI)

See more Code Signing Examples

Demonstrates how to Authenticode sign a Windows Installer package (.msi). Signing MSI packages requires Chilkat v11.7.0 or later. The package is signed in place, and the certificate must have an RSA key: Windows does not accept the signature of an MSI that was signed with an ECDSA certificate. Go

    success := false

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  Signing a Windows Installer package (.msi) requires Chilkat v11.7.0 or later.

    //  Load the code signing certificate.  It must have access to its private key.
    cert := chilkat.NewCert()
    success = cert.LoadPfxFile("C:/someDir/myCodeSigningCert.pfx","pfx password")
    if success == false {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        return
    }

    //  Use a certificate with an RSA key to sign an MSI.
    //  Windows does not accept the signature of an MSI that was signed with an ECDSA certificate
    //  (signtool verify and the Digital Signatures tab of the file's properties report it as invalid).
    //  This is a limitation of signed MSI files on Windows.  It does not apply to EXE, DLL, PowerShell,
    //  or VBScript files, which can be signed with either kind of certificate.
    if cert.IsRsa() == false {
        fmt.Println("Use an RSA code signing certificate to sign an MSI.")
        cert.DisposeCert()
        return
    }

    //  Sign with SHA256, and ask a timestamp authority for a timestamp.  A timestamp lets the
    //  signature continue to validate after the code signing certificate has expired.
    //  
    //  {
    //    "hashAlg": "sha256",
    //    "timestampToken": {
    //      "enabled": true,
    //      "tsaUrl": "http://timestamp.digicert.com",
    //      "requestTsaCert": true,
    //      "hashAlg": "sha256"
    //    }
    //  }
    json := chilkat.NewJsonObject()
    json.UpdateString("hashAlg","sha256")
    json.UpdateBool("timestampToken.enabled",true)
    json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com")
    json.UpdateBool("timestampToken.requestTsaCert",true)
    json.UpdateString("timestampToken.hashAlg","sha256")

    msiPath := "C:/someDir/MyAppSetup.msi"

    signer := chilkat.NewCodeSign()

    //  The .msi is modified in place.  The signature is stored in the package's digital signature stream.
    //  If the package is already signed, the new signature replaces the existing one.
    success = signer.AddSignature(msiPath,cert,json)
    if success == false {
        fmt.Println(signer.LastErrorText())
        cert.DisposeCert()
        json.DisposeJsonObject()
        signer.DisposeCodeSign()
        return
    }

    fmt.Println("Signed the MSI.")

    //  Verify the signature that was just added.
    sigInfo := chilkat.NewJsonObject()
    valid := signer.VerifySignature(msiPath,sigInfo)
    if valid == false {
        fmt.Println(signer.LastErrorText())
        cert.DisposeCert()
        json.DisposeJsonObject()
        signer.DisposeCodeSign()
        sigInfo.DisposeJsonObject()
        return
    }

    fmt.Println("The signature is valid.")

    cert.DisposeCert()
    json.DisposeJsonObject()
    signer.DisposeCodeSign()
    sigInfo.DisposeJsonObject()