(Swift) Create CAdES p7m using USB Token or Smartcard on iOS iPhone

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Note: This example requires Chilkat v10.0.0 or greater.

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

    // When signing with a USB token or smartcard, the only coding difference is how the certificate
    // gets loaded.  To load the default certificate from the connected USB token or smartcard, just call
    // LoadFromSmartcard with an empty string argument.
    // 
    // This requires Chilkat v10.0.0 or later.
    // 
    // ------------------------------------------------------------------------------------------------------------------------------------------------------
    // Important: In your Xcode project, you'll need to add the "com.apple.token" entitlement.
    // Also, adding the com.apple.token in the "Project > Signing & Capabilities" will actually add $(AppIdentifierPrefix)com.apple.token, which does not work. 
    // Edit the entitlements file directly and add only com.apple.token
    // If using a Yubikey, you'll only find the certificate if it is added in the Yubikey app as Public.
    // ------------------------------------------------------------------------------------------------------------------------------------------------------
    let cert = CkoCert()!
    var success: Bool = cert.load(fromSmartcard: "")
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    let crypt = CkoCrypt2()!

    success = crypt.setSigning(cert)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true.
    crypt.cadesEnabled = true

    crypt.hashAlgorithm = "sha256"

    let signedAttrs = CkoJsonObject()!
    signedAttrs.updateInt("contentType", value: 1)
    signedAttrs.updateInt("signingTime", value: 1)
    signedAttrs.updateInt("messageDigest", value: 1)
    signedAttrs.updateInt("signingCertificateV2", value: 1)
    crypt.signingAttributes = signedAttrs.emit()

    // You can sign any type of file..
    // ----------------------------------------------------------
    // Update to specify the paths to your input and output files.
    // ----------------------------------------------------------
    var inputXmlPath: String? = "...."
    var outputP7mPath: String? = "... signed.p7m"

    // Create the CAdES-BES attached signature, which contains the original data.
    // Chilkat will build the .p7m locally, but will (internally) use ARSS
    // to do the RSA signing remotely.
    success = crypt.createP7M(inputXmlPath, p7mPath: outputP7mPath)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success.")

}