Go

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

See more Encryption Examples

_LANGUAGE_ 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. Go

    success := false

    // 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
    }

    jsonCN := chilkat.NewJsonObject()
    jsonCN.UpdateString("CN",signingCertSubject)

    cert := chilkat.NewCert()
    success = certStore.FindCert(jsonCN,cert)
    if success == false {
        fmt.Println("Failed to find certificate by subject common name.")
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        jsonCN.DisposeJsonObject()
        cert.DisposeCert()
        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())
        crypt.DisposeCrypt2()
        certStore.DisposeCertStore()
        jsonCN.DisposeJsonObject()
        cert.DisposeCert()
        return
    }

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

    fmt.Println("Success!")

    crypt.DisposeCrypt2()
    certStore.DisposeCertStore()
    jsonCN.DisposeJsonObject()
    cert.DisposeCert()