(Go) Sign a File to Create a .p7s (Detached Signature)

Go example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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 := 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 .p7s as output:
    inFile := "/Users/chilkat/testData/pdf/sample.pdf"
    sigFile := "/Users/chilkat/testData/p7s/sample.p7s"

    success = crypt.CreateP7S(inFile,sigFile)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        return
    }

    success = crypt.VerifyP7S(inFile,sigFile)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        return
    }

    cert.DisposeCert()

    fmt.Println("Success!")

    crypt.DisposeCrypt2()
    certStore.DisposeCertStore()