(Swift 3,4,5...) PKCS11 Sign PDF using Certificate and Private Key on Smart Card / USB Token

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Sample code showing how to use PKCS11 to sign a PDF with a certificate and private key stored on a smart card or USB token.

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

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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()!

    pkcs11.sharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll"
    var pin: String? = "0000"
    var userType: Int = 1

    // Establish a PKCS11 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
    }

    // Get the certificate (on the smart card) that has a private key.
    // There are other ways to locate a certificate on the HSM.
    // This example assumes there is a single certificate w/ private key.
    let cert = CkoCert()!
    success = pkcs11.findCert("privateKey", partValue: "", cert: cert)
    if success == true {
        print("Cert with private key: \(cert.subjectCN!)")
    }
    else {
        print("No certificates having a private key were found.")
        success = pkcs11.closeSession()
        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.update("appearance.y", value: "top")
    json.update("appearance.x", value: "left")
    json.update("appearance.fontScale", value: "10.0")
    json.update("signingAlgorithm", value: "pss")
    json.update("hashAlgorithm", value: "sha256")

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

    success = pdf.sign(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.")

}