(Swift 3,4,5...) Sign String to create a CAdES-T Signature

This example will sign a string to create a CAdEST-T signature.

Note: This example requires Chilkat v9.5.0.78 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.

    let crypt = CkoCrypt2()!

    // This example will use the certificate + private key currently inserted into a smartcard reader.
    let cert = CkoCert()!

    // If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
    cert.smartCardPin = "000000"
    var success: Bool = cert.load(fromSmartcard: "")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    // Note: It is also possible to use certs from .pfx/.p12, .pem, or other sources such as 
    // pre-installed Windows certificates.

    success = crypt.setSigning(cert)

    // Use SHA-256 rather than the default of SHA-1
    crypt.hashAlgorithm = "sha256"

    // Create JSON that tells Chilkat what signing attributes to include:
    let attrs = CkoJsonObject()!
    attrs.updateBool("contentType", value: true)
    attrs.updateBool("signingTime", value: true)
    attrs.updateBool("messageDigest", value: true)
    attrs.updateBool("signingCertificateV2", value: true)

    // A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
    // We must include the TSA's URL, as well as a few options to indicate what is desired.
    // Except for the TSA URL, the options shown here are typically what you would need.
    attrs.updateBool("timestampToken.enabled", value: true)
    attrs.update("timestampToken.tsaUrl", value: "https://freetsa.org/tsr")
    attrs.updateBool("timestampToken.addNonce", value: false)
    attrs.updateBool("timestampToken.requestTsaCert", value: true)
    attrs.update("timestampToken.hashAlg", value: "sha256")

    crypt.signingAttributes = attrs.emit()

    var strToSign: String? = "THIS IS MY ID"

    let bd = CkoBinData()!
    bd.append(strToSign, charset: "utf-8")

    // This creates the CAdES-T signature.  During the signature creation, it
    // communicates with the TSA to get a timestampToken.
    // The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
    success = crypt.opaqueSignBd(bd)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Get the signature in base64 format:
    print("\(bd.getEncoded("base64_mime")!)")

    // Or save the signature to a file.
    bd.writeFile("qa_output/cades-t_sample.p7m")

    print("Success.")

}