Пример работы с цифровой подписью

import UIKit
 
class ViewController: UIViewController {
 
    // Определим выходные переменные
    @IBOutlet weak var signatureIDTextField: UITextField!
    @IBOutlet weak var resultTextView: UITextView!
    @IBOutlet weak var getCertificatesButton: UIButton!
    @IBOutlet weak var signButton: UIButton!
    @IBOutlet weak var getSignsButton: UIButton!
    @IBOutlet weak var removeSignButton: UIButton!
 
    // Переопределим метод
    override func viewDidLoad() {
        super.viewDidLoad()
        self.deactivateButtons()
        self.initializeFramework()
        self.auth {
            self.activateButtons()
            self.resultTextView.text = "Authentication success"
        }
    }
 
    // Зададим метод, который будет выполняться при нажатии на кнопку
    @IBAction func getCertificatesPressed(_ sender: UIButton) {
        self.getCertificatesDSS { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func signPressed(_ sender: UIButton) {
        self.signDSS { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
            if let signatureId = self.getSignatureId(from: jsonResult) {
                self.signatureIDTextField.text = String(signatureId)
            } else {
                self.signatureIDTextField.text = ""
            }
        }
    }
 
    @IBAction func getSignsPressed(_ sender: UIButton) {
        self.getSignsDSS { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func removeSignPressed(_ sender: UIButton) {
        if let signatureId = Int(self.signatureIDTextField.text ?? "") {
            self.removeSign(signatureId) { (jsonResult) in
                self.resultTextView.text = String(format: "%@", jsonResult)
            }
        }
    }
 
    // Выполним инициализацию фреймворка
    private func initializeFramework() {
        let apiVersion: String = "v1"
        let host: String = "http://testmasterfmp.fsight.cloud/"
        let environment: String = "Leonid_environment"
        let project: String = "Leonid_project"
        let device: String = (UIDevice.current.identifierForVendor?.uuidString)!
        HHFWController.sharedInstance().initWithCredentials(
            apiVersion,
            host: host,
            environment: environment,
            project: project,
            device: device
        )
    }
 
    // Выполним аутентификацию
     private func auth(completion: @escaping ()->()) {
        let username: String = "Leonid"
        let password: String = "123123"
        HHFWController.sharedInstance().auth(username, password: password){ (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Auth success")
                completion()
            } else {
                print("Auth error")
            }
        }
    }
 
    // Получим список доступных сертификатов
    private func getCertificatesDSS(completion: @escaping (NSDictionary)->()) {
        let dssPassword = "Saprun123"
        HHFWController.sharedInstance().getCertificatesWithPassword(dssPassword) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Get certificates success")
                completion(jsonDict)
            } else {
                print("Get certificates error")
            }
        }
    }
 
    // Подпишем ресурс сертификатом
    private func signDSS(completion: @escaping (NSDictionary)->()) {
        let resourceName = "GetBudgetPlanning"
        let tableName = "ПланированиеБюджета"
        let params = "{}"
        let column = "Номер"
        let hhiveId = "1"
        let dssPassword = "Saprun123"
        let certificateId = "12831"
        let certificatePin = "123"
        HHFWController.sharedInstance().signCertificate(
            withResource: resourceName,
            table: tableName,
            params: params,
            column: column,
            hhiveId: hhiveId,
            password: dssPassword,
            certificateId: certificateId,
            certificatePin: certificatePin
        ) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Sign resource success")
                completion(jsonDict)
            } else {
                print("Sign resource error")
            }
        }
    }
 
    // Получим подписи
    private func getSignsDSS(completion: @escaping (NSDictionary)->()) {
        HHFWController.sharedInstance().signs { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Signs success")
                completion(jsonDict)
            } else {
                print("Signs error")
            }
        }
    }
 
    // Удалим подпись
    private func removeSign(_ signatureId: Int, completion: @escaping (NSDictionary)->()) {
        HHFWController.sharedInstance().remove(withSignId: signatureId) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Remove sign success")
                completion(jsonDict)
            } else {
                print("Remove sign error")
            }
        }
    }
 
    // Вызовем вспомогательные классы
    private func getSignatureId(from json: NSDictionary) -> Int? {
        var resultSignatureId: Int? = nil
        let jsonDict = parseServerJSONResponse(json: json)
        if self.getResponseStatus(from: jsonDict) == "ok" {
            if let result = jsonDict?["result"] as? [String: Any],
                let raw = result["raw"] as? [String:Any],
                let signatureId = raw["signature_id"] as? Int {
                resultSignatureId = signatureId
            }
        }
        return resultSignatureId
    }
 
    func parseServerJSONResponse(json: NSDictionary) -> [String: Any]? {
        return json as? [String: Any]
    }
 
    func getResponseStatus(from json: [String: Any]?) -> String? {
        return json?["status"] as? String
    }
 
    // Зададим методы для отображения элементов пользовательского интерфейса приложения
    private func deactivateButtons() {
        self.getCertificatesButton.isEnabled = false
        self.signButton.isEnabled = false
        self.getSignsButton.isEnabled = false
        self.removeSignButton.isEnabled = false
    }
 
    private func activateButtons() {
        self.getCertificatesButton.isEnabled = true
        self.signButton.isEnabled = true
        self.getSignsButton.isEnabled = true
        self.removeSignButton.isEnabled = true
    }
}