(Swift 2) Sign PDF in the Cloud using AWS CloudHSM

See more Signing in the Cloud Examples

Demonstrates how to sign a PDF using AWS CloudHSM. The signing of the hash happens on a hardware token in AWS CloudHSM. Everything else involving the updating the PDF to add the signature happens locally within Chilkat.

Note: This example requires Chilkat v9.5.0.96 or greater.

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

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    let pkcs11 = CkoPkcs11()

    // Provide the path to the AWS CloudHSM PKCS11 driver.
    // This example runs on Windows, so we'll provide the CloudHSM DLL.
    // If your code runs on Linux, the CloudHSM driver might be at /opt/cloudhsm/lib/libcloudhsm_pkcs11.so
    pkcs11.SharedLibPath = "C:\\Program Files\\Amazon\\CloudHSM\\lib\\cloudhsm_pkcs11.dll"

    // Your PIN should be a string containing your crypto user's login and password, with a colon char delimiting.
    // See https://docs.aws.amazon.com/cloudhsm/latest/userguide/pkcs11-pin.html
    var pin: String? = "user:password"
    var userType: Int = 1

    // Establish a PKCS logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
    var success: Bool = pkcs11.QuickSession(userType, pin: pin)
    if success == false {
        print("\(pkcs11.LastErrorText)")
        return
    }

    let cert = CkoCert()
    success = cert.LoadFromFile("qa_data/certs/myCert.cer")
    if success == false {
        print("\(cert.LastErrorText)")
        return
    }

    // Tell the certificate to link with the PKCS11 session.
    // The cert's private key should be installed on the CloudHSM.
    // If there are multiple private keys on the CloudHSM, then Chilkat will automatically
    // locate and use the private key corresponding to the certificate.
    success = cert.LinkPkcs11(pkcs11)
    if success == false {
        print("\(cert.LastErrorText)")
        return
    }

    // --------------------------------------------------------------------------
    // At this point, we have the cert to be used for signing.
    // Our PDF signing code is the same as for a cert obtained from any other source..

    let pdf = CkoPdf()

    // Load a PDF to be signed.
    success = pdf.LoadFile("qa_data/pdf/hello.pdf")
    if success == false {
        print("\(pdf.LastErrorText)")
        success = pkcs11.CloseSession()
        return
    }

    let json = CkoJsonObject()

    json.UpdateInt("page", value: 1)
    json.UpdateString("appearance.y", value: "top")
    json.UpdateString("appearance.x", value: "left")
    json.UpdateString("appearance.fontScale", value: "10.0")
    json.UpdateString("signingAlgorithm", value: "pss")
    json.UpdateString("hashAlgorithm", value: "sha256")

    var i: Int = 0
    json.I = i
    json.UpdateString("appearance.text[i]", value: "Digitaly signed by: Xyz Widgets, Inc.")
    i = i + 1
    json.I = i
    json.UpdateString("appearance.text[i]", value: "current_dt")
    i = i + 1
    json.I = i
    json.UpdateString("appearance.text[i]", value: "blah blah blah")

    // The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
    success = pdf.SetSigningCert(cert)

    success = pdf.SignPdf(json, outFilePath: "qa_output/out.pdf")
    if success == false {
        print("\(pdf.LastErrorText)")
        success = pkcs11.CloseSession()
        return
    }

    // --------------------------------------------------------------------------

    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.Logout()
    if success == false {
        print("\(pkcs11.LastErrorText)")
        success = pkcs11.CloseSession()
        return
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = pkcs11.CloseSession()
    if success == false {
        print("\(pkcs11.LastErrorText)")
        return
    }

    print("Success.")

}