使用 Swift 向 iOS 钥匙串添加项目和查询

Question

我无法将所有可用于从iOS Keychain 添加数据和查询数据的Objective C 代码示例转换为Swift。我正在尝试对字符串（访问令牌）进行基本存储并将其读回。我已经查看了有关 Stack Overflow 的其他一些问题，但我无法让它发挥作用。我试图从各种来源拼凑出一个解决方案。

编辑 1： 我尝试了更基本的设置，因为我认为我的 self.defaultKeychainQuery 可能把事情搞砸了。我已将以下代码更新为最新版本。

编辑 2： 搞定了。我没有正确地将数据值添加到保存查询中。我需要将字符串转换为 NSData。我已将以下代码更新为最新的工作版本。

编辑 3： 正如 Xerxes 在下面指出的那样，由于字典的某些问题，此代码不适用于高于 Beta 1 的 Xcode 版本。如果您知道解决此问题的方法，请告诉我。

更新：我把它变成了keychain library written in Swift called Locksmith。

---

保存

class func save(service: NSString, data: NSString) {
  var dataFromString: NSData = data.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
  // Instantiate a new default keychain query
  var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPassword, service, userAccount, dataFromString], forKeys: [kSecClass, kSecAttrService, kSecAttrAccount, kSecValueData])

  // Delete any existing items
  SecItemDelete(keychainQuery as CFDictionaryRef)

  // Add the new keychain item
  var status: OSStatus = SecItemAdd(keychainQuery as CFDictionaryRef, nil)

  // Check that it worked ok
  println("Saving status code is: \(status)")
}

加载

  class func load(service: NSString) -> AnyObject? {
    // Instantiate a new default keychain query
    // Tell the query to return a result
    // Limit our results to one item
    var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPassword, service, userAccount, kCFBooleanTrue, kSecMatchLimitOne], forKeys: [kSecClass, kSecAttrService, kSecAttrAccount, kSecReturnData, kSecMatchLimit])



    // I'm not too sure what's happening here...
    var dataTypeRef :Unmanaged<AnyObject>?

    // Search for the keychain items
    let status: OSStatus = SecItemCopyMatching(keychainQuery, &dataTypeRef)


    println("Loading status code is: \(status)")

    // I'm not too sure what's happening here...
    let opaque = dataTypeRef?.toOpaque()

    if let op = opaque? {
      let retrievedData = Unmanaged<NSData>.fromOpaque(op).takeUnretainedValue()
      println("Retrieved the following data from the keychain: \(retrievedData)")
      var str = NSString(data: retrievedData, encoding: NSUTF8StringEncoding)
      println("The decoded string is \(str)")
    } else {
      println("Nothing was retrieved from the keychain.")
    }

    return nil
  }

用法（视图控制器）

KeychainService.saveToken("sometoken")
KeychainService.loadToken()

使用这些便捷方法

class func saveToken(token: NSString) {
    self.save("service", data: token)
  }

class func loadToken() {
    var token = self.load("service")
    if let t = token {
      println("The token is: \(t)")
    }
  }

这导致控制台中的输出：

Saving status code is: 0
Loading status code is: 0
Retrieved the following data from the keychain: <736f6d65 746f6b65 6e>
The decoded string is sometoken

非常感谢您的帮助。我不太确定一旦获得 dataTypeRef 后如何处理它，或者它是否有上面代码给出的任何数据。

Answer 1

为了让它工作，你需要检索钥匙串常量的保留值，然后首先像这样存储：

let kSecClassValue = kSecClass.takeRetainedValue() as NSString
let kSecAttrAccountValue = kSecAttrAccount.takeRetainedValue() as NSString
let kSecValueDataValue = kSecValueData.takeRetainedValue() as NSString
let kSecClassGenericPasswordValue = kSecClassGenericPassword.takeRetainedValue() as NSString
let kSecAttrServiceValue = kSecAttrService.takeRetainedValue() as NSString
let kSecMatchLimitValue = kSecMatchLimit.takeRetainedValue() as NSString
let kSecReturnDataValue = kSecReturnData.takeRetainedValue() as NSString
let kSecMatchLimitOneValue = kSecMatchLimitOne.takeRetainedValue() as NSString

然后您可以像这样引用 NSMutableDictionary 中的值：

var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, kCFBooleanTrue, kSecMatchLimitOneValue], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecReturnDataValue, kSecMatchLimitValue])

我写了一篇关于它的博客文章： http://rshelby.com/2014/08/using-swift-to-save-and-query-ios-keychain-in-xcode-beta-4/

希望这会有所帮助！

谢尔比

Answer 2

我为这个简单的任务编写了一个演示应用程序和辅助函数：为 Keychain 中的给定键写入/读取文本字符串。

https://github.com/marketplacer/keychain-swift

let keychain = KeychainSwift()
keychain.set("hello world", forKey: "my key")
keychain.get("my key")
keychain.delete("my key")

Answer 3

我对如何添加、获取、删除密码的解释（对于那些懒惰使用此线程中提供的库的人）：

// Saving password associated with the login and service
let userAccount = "user's login"
let service = "service name"
let passwordData: NSData = self.textfield_password.text!.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!

let keychainQuery: [NSString: NSObject] = [
        kSecClass: kSecClassGenericPassword,
        kSecAttrAccount: userAccount,
        kSecAttrService: service,
        kSecValueData: passwordData]    

SecItemDelete(keychainQuery as CFDictionaryRef) //Deletes the item just in case it already exists
let keychain_save_status: OSStatus = SecItemAdd(keychainQuery as CFDictionaryRef, nil)
print("Keychain saving code is: \(keychain_save_status)")

...

// Getting the password associated with the login and service
let userAccount = "user's login"
let service = "service name"
let keychainQuery: [NSString: NSObject] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: service,
    kSecAttrAccount: userAccount,
    kSecReturnData: kCFBooleanTrue,
    kSecMatchLimit: kSecMatchLimitOne]

var rawResult: AnyObject?
let keychain_get_status: OSStatus = SecItemCopyMatching(keychainQuery, &rawResult)
print("Keychain getting code is: \(keychain_get_status)")

if (keychain_get_status == errSecSuccess) {
    let retrievedData = rawResult as? NSData
    let pass = NSString(data: retrievedData!, encoding: NSUTF8StringEncoding)
    print("Username: \(userAccount), password: \(pass!)")
    // Do your work with the retrieved password here
} else {
    print("No login data found in Keychain.")

...

//Deleting user's credentials from Keychain. Password is optional for the query when you delete, in most cases you won't know it after all.
let userAccount = "user's login"
let service = "service name"

let keychainQuery: [NSString: NSObject] = [
        kSecClass: kSecClassGenericPassword,
        kSecAttrAccount: userAccount,
        kSecAttrService: service]
let keychain_delete_status: OSStatus = SecItemDelete(keychainQuery as CFDictionaryRef)
print("Keychain deleting code is: \(keychain_delete_status)")

结果代码和其他有用信息可以在官方文档中找到：https://developer.apple.com/library/ios/documentation/Security/Reference/keychainservices/

Answer 4

对于 Swift 用户

在钥匙串中添加/检索/更新字段的单行代码：
https://github.com/jrendel/SwiftKeychainWrapper

用法

将字符串值添加到钥匙串：

let saveSuccessful: Bool = KeychainWrapper.setString("Some String", forKey: "myKey")  

从钥匙串中检索字符串值：

let retrievedString: String? = KeychainWrapper.stringForKey("myKey")

从钥匙串中移除一个字符串值：

let removeSuccessful: Bool = KeychainWrapper.removeObjectForKey("myKey")

Answer 5

我想我已经找到了解决方案。我在上面编辑了我的帖子以包含有效的代码（至少对我而言）。我也在这里写过博客：using the iOS Keychain with Swift (example code)。

8 月 11 日更新：我已根据 rshelby 的 cmets 更新了博客文章中的代码。看看吧。

更新：我把它变成了keychain library written in Swift called Locksmith。

---

保存

class func save(service: NSString, data: NSString) {
  var dataFromString: NSData = data.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
  // Instantiate a new default keychain query
  var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPassword, service, userAccount, dataFromString], forKeys: [kSecClass, kSecAttrService, kSecAttrAccount, kSecValueData])

  // Delete any existing items
  SecItemDelete(keychainQuery as CFDictionaryRef)

  // Add the new keychain item
  var status: OSStatus = SecItemAdd(keychainQuery as CFDictionaryRef, nil)

  // Check that it worked ok
  println("Saving status code is: \(status)")
}

加载

  class func load(service: NSString) -> AnyObject? {
    // Instantiate a new default keychain query
    // Tell the query to return a result
    // Limit our results to one item
    var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPassword, service, userAccount, kCFBooleanTrue, kSecMatchLimitOne], forKeys: [kSecClass, kSecAttrService, kSecAttrAccount, kSecReturnData, kSecMatchLimit])



    // I'm not too sure what's happening here...
    var dataTypeRef :Unmanaged<AnyObject>?

    // Search for the keychain items
    let status: OSStatus = SecItemCopyMatching(keychainQuery, &dataTypeRef)


    println("Loading status code is: \(status)")

    // I'm not too sure what's happening here...
    let opaque = dataTypeRef?.toOpaque()

    if let op = opaque? {
      let retrievedData = Unmanaged<NSData>.fromOpaque(op).takeUnretainedValue()
      println("Retrieved the following data from the keychain: \(retrievedData)")
      var str = NSString(data: retrievedData, encoding: NSUTF8StringEncoding)
      println("The decoded string is \(str)")
    } else {
      println("Nothing was retrieved from the keychain.")
    }

    return nil
  }

用法（视图控制器）

KeychainService.saveToken("sometoken")
KeychainService.loadToken()

使用这些便捷方法

class func saveToken(token: NSString) {
    self.save("service", data: token)
  }

class func loadToken() {
    var token = self.load("service")
    if let t = token {
      println("The token is: \(t)")
    }
  }

这导致控制台中的输出：

Saving status code is: 0
Loading status code is: 0
Retrieved the following data from the keychain: <736f6d65 746f6b65 6e>
The decoded string is sometoken