{"id":2857,"date":"2017-03-21T11:16:28","date_gmt":"2017-03-21T05:46:28","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=2857"},"modified":"2023-01-20T18:55:54","modified_gmt":"2023-01-20T13:25:54","slug":"keychain-handling-in-ios","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/keychain-handling-in-ios\/","title":{"rendered":"Keychain Handling in iOS"},"content":{"rendered":"

 <\/p>\n

What is Keychain <\/b><\/p>\n

Keychain is Apple\u2019s way to manage password in the the\u00a0device. Whether\u00a0its Mac or iOS Device they use the same Keychain system tool back inside. It stores all your passwords for applications, sensitive information relating to website’s credentials and credit card\/ debit card numbers. The main objective of existence is to <\/span>secure password & sensitive information<\/span><\/i> of the\u00a0device.<\/span><\/p>\n

\"Keychain\"<\/a><\/p>\n

Objective<\/b><\/p>\n

Say, we have an app where you want to store username and password. Now, in such scenario, you will store these credentials (username and password) in NSUserDefaults. <\/span><\/p>\n

Notably, it’s a great option to achieve the requirement but, it won\u2019t give the utmost security to your password. As\u00a0every app maintains a .plist file to save NSUserDefault value which can be extracted. And, it seems it\u2019s not a reliable process to do so. <\/span><\/p>\n

So, We will store the password in Keychain rather in NSUserDefault.<\/span><\/p>\n

Prerequisite<\/b><\/p>\n

    \n
  1. You need a <\/span>Keychain Wrapper reusable <\/span><\/i>files, which will handle your read-write operations. <\/span><\/li>\n
  2. Then, You need a <\/span>KeychainManager.swift <\/span><\/i>which is app specific and handles all the read & write keychain request. Most of the time we use keychain manager to set & get the\u00a0password.<\/span><\/li>\n<\/ol>\n

    Demonstration<\/b><\/p>\n

    Step1.<\/b><\/p>\n

    First, you import the <\/span>Keychain Wrapper<\/b> files in your Project. <\/span><\/p>\n

    \"Screen<\/a><\/p>\n

    And, then import <\/span>KeychainManager.swift <\/b>which will behave as a middle layer between your View Controller(s) and KeychainWrapper Library. <\/span><\/p>\n

    Step2.<\/b><\/p>\n

    I\u2019m assuming that, there is a requirement of storing <\/span>password. <\/b>So, we have a getter & setter methods belong to password.<\/span><\/p>\n

      \n
    1. getPasswordFromKeychain()->String?<\/span><\/li>\n
    2. setPasswordInKeychain(passedValue:)->Bool<\/span><\/li>\n<\/ol>\n

      First method is a getter method which returns <\/span>String?<\/b> (String Optional type) which suggest the method will either return <\/span>String<\/b> or <\/span>nil<\/b>.<\/span><\/p>\n

      Second method is a setter-method which accepts <\/span>String<\/b> type value as a\u00a0parameter. It will return a BOOL status after completing the operation. <\/span><\/p>\n

      Step3.<\/b><\/p>\n

      On View Controller level, whenever you want to persist data into Keychain, you would call setter method (<\/span>setPasswordInKeychain(passedValue:)<\/b>) with the string parameter which you want to store. <\/span><\/p>\n

      if KeychainManager.setPasswordInKeychain(passedValue: \"Hello@1234\") == true{\r\n\r\n\u00a0\u00a0\/\/ After Success\r\n}<\/pre>\n
      If <\/span>setPasswordInKeychain(passedValue:) <\/b>acknowledge true or false. If it is true then, it has successfully inserted data into Keychain.<\/span><\/p>\n
      Now, it\u2019s time to retrieve data from Keychain. So, we will call another method <\/span>getPasswordFromKeychain()->String?<\/b><\/p>\n
      if let val = KeychainManager.getPasswordFromKeychain(){\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0print(\"Saved Value is : \\(val)\")\r\n\r\n}<\/pre>\n
       <\/p>\n
      Extra Features<\/b><\/p>\n
        \n
      1. Say, you want to store some private into Keychain apart from password.<\/span><\/li>\n<\/ol>\n
        Approach :<\/b><\/p>\n
        Then, you need to modify <\/span>Keychain Manager <\/b>file according to your need. <\/span><\/p>\n
        private enum Keys:String{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0case Password = \"kPassword\"\r\n\u00a0\u00a0\u00a0}<\/pre>\n
        First, you need to add Key Name in your enum Keys. \u00a0Say, you want to add <\/span>token <\/b>then, it would look like<\/span><\/p>\n
        \u00a0\u00a0\u00a0private enum Keys:String{\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0case Password = \"kPassword\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0case Token = \"kToken\"\r\n\u00a0\u00a0\u00a0}<\/pre>\n
        Second, write a getter and Setter methods.<\/p>\n
        In both the methods, you just need to change the Key name and method\u2019s name.<\/span><\/p>\n
         <\/p>\n
        \/\/ Get Token\r\nstatic func getTokenFromKeychain()->String?{\r\n\r\n\u00a0\u00a0\u00a0\u00a0return self.read(key: Keys.Token.rawValue) ?? nil\r\n}\u00a0 \u00a0\r\n\r\n\/\/Set Token\r\nstatic func setTokenInKeychain(passedValue:String)->Bool{\r\n\r\n\u00a0\u00a0\u00a0\u00a0return self.write(value: passedValue, key: Keys.Token.rawValue)\r\n}<\/pre>\n
          \n
        1. Say, you have a logout feature and you want to clear Keychain data of your app. <\/span><\/li>\n<\/ol>\n
          Approach<\/b>:<\/span><\/p>\n
          You need to call <\/span>clearKeychainData() <\/b>on logout button click. <\/span><\/p>\n
            \n
          1. What if, User uninstall your app. And, then you want to delete the existing data from Keychain with it. <\/span><\/li>\n<\/ol>\n
            Approach:<\/b><\/p>\n
            In This case, you need to use NSUserDefault to check whether your app is launching for first time. If it is <\/span>true <\/b>then you should clear Keychain data.<\/span><\/p>\n
            \u00a0<\/b><\/p>\n
            func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if(PersistenceManager.shared.getOpenForFirstTime(key: PersistenceKeys.isFirstTime)){\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/Clear Keychain Data\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0let _ = KeychainManager.clearKeychainData()\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/Set To \"False\"\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0PersistenceManager.shared.setOpenForFirstTime(value: false, key: PersistenceKeys.isFirstTime)\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return true\r\n\r\n\u00a0\u00a0\u00a0}<\/pre>\n
            Note<\/b>: Please refer to KeychainDemo for better understanding.<\/span><\/p>\n
            Conclusion<\/b><\/p>\n
            Whenever you want to save any piece of data into your keychain. You should add <\/span>Keychain Wrapper <\/b>files into your project. And then, modify <\/span>Keychain Manager<\/span><\/i> according to your requirement. And, that\u2019s it. \u00a0You are good to go \ud83d\ude42<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
              What is Keychain Keychain is Apple\u2019s way to manage password in the the\u00a0device. Whether\u00a0its Mac or iOS Device they use the same Keychain system tool back inside. It stores all your passwords for applications, sensitive information relating to website’s credentials and credit card\/ debit card numbers. The main objective of existence is to secure […]<\/p>\n","protected":false},"author":1,"featured_media":2859,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,71],"tags":[16,194,193,192],"class_list":["post-2857","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ios","category-mobile","tag-keychain","tag-password-manager","tag-save-password","tag-security-in-ios"],"yoast_head":"\nKeychain Handling in iOS | InnovationM Blog<\/title>\n<meta name=\"description\" content=\"Learn to manage Password in iOS using Keychain handling.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/keychain-handling-in-ios\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Keychain Handling in iOS | InnovationM Blog\" \/>\n<meta property=\"og:description\" content=\"Learn to manage Password in iOS using Keychain handling.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.innovationm.com\/blog\/keychain-handling-in-ios\/\" \/>\n<meta property=\"og:site_name\" content=\"InnovationM - 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