(Go) Sign a File to Create a .p7m File (using a PFX)

Go example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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

    crypt := chilkat.NewCrypt2()

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    signingCertSubject := "Acme Inc"
    pfxFilename := "/Users/chilkat/testData/pfx/acme.pfx"
    pfxPassword := "test123"

    certStore := chilkat.NewCertStore()
    success := certStore.LoadPfxFile(pfxFilename,pfxPassword)
    if success != true {
        fmt.Println(certStore.LastErrorText())
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        return
    }

    // cert is a Cert
    cert := certStore.FindCertBySubjectCN(signingCertSubject)
    if certStore.LastMethodSuccess() == false {
        fmt.Println("Failed to find certificate by subject common name.")
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        return
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert)

    // We can sign any type of file, creating a .p7m as output:
    inFile := "/Users/chilkat/testData/pdf/sample.pdf"
    outputFile := "/Users/chilkat/testData/p7m/sample.pdf.p7m"
    success = crypt.CreateP7M(inFile,outputFile)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        return
    }

    // Verify and restore the original file:
    success = crypt.SetVerifyCert(cert)

    inFile = outputFile
    outputFile = "/Users/chilkat/testData/pdf/restored.pdf"

    success = crypt.VerifyP7M(inFile,outputFile)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        return
    }

    cert.DisposeCert()

    fmt.Println("Success!")

    crypt.DisposeCrypt2()
    certStore.DisposeCertStore()