swift之保存数据到keychain
访问KeyChain
1.在mac上按下 Command+Space 输入Keychain Access
2.在终端输入security find-generic-password -help
读取配置文件授权
cd ~/Desktop
//ios产看应用的授权来发现他需要的访问类型，应用的授权以编码的形式保存在对应的签名的配置文件中，嘉定已经创建一个配置文件，名为KeycahinTest_Dev.mobileprovision并且保存在桌面
security cms -D -i KeychainTest_Dev.mobileprovision | grep -A12 “Entitlements”
keychain-acess-groups 定义同一开发者开发的应用所共享的钥匙串群组标识
在ios应用中使用key-chain
1.引入框架 import Security 修改Build Setting中Capabilities支持
使用Touch ID验证用户
1.引入LocalAuthentication框架
2.创建LAContext类的实例
3.调用LAContext实例的canEvaluatePolicy:（LAPolicyDeviceOwnerAuthenticaitonWithBiometrics）error:方法确认Touch Id是否可用
4.Touchid可用则使用LAContext的evaluatePolicy:localizedReason:reply:方法验证TouchID的用户
import UIKit
import LocalAuthentication
class ViewController: UIViewController {
@IBOutlet weak var buttonCheckTouchId: UIButton!
@IBOutlet weak var buttonUseTouchId: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
}
//touchId是否可用
func checkTouchIdAvailability(sender: AnyObject) {
let context = LAContext()
var error: NSError?
let isTouchIdAvailable = context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error)
buttonUseTouchId.isEnabled = isTouchIdAvailable
//Touch ID不可用的
if isTouchIdAvailable == false {
let alertController = UIAlertController(title: "Touch Id", message: "TocuhId is not available", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
present(alertController, animated: true, completion: nil)
}
}
@IBAction func userTouchId(sender: AnyObject) {
let context = LAContext()
var error: NSError?
//localizedReason标识在应用中请求用户提供指纹进行验证的文本提示内容
let reason = "please authenticate with Touch id to access your private information"
context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason, reply: { (success: Bool, error: NSError!) in
if success{
//用户已经通过验证
}else{
//用户为通过验证
}
} as! (Bool, Error?) -> Void)
}
}
在钥匙串中存储数据是以键值对方式存储的
kSecCalss 安全存储字符串数据
kSecClassGenericPassword
kSecAttrService 应用bundle标识字符窜
kSecAttrAcount 存储数据的对应键，可以是任意有意义的字符串
kSecValueData 该键的值是一个NSData实例，存放kSecAttrAccount对应的数据
OSStatus类型在xcode中Commond+ shilft + O 输入SecBase 查找errSecSucces，可以看到OSStatus类型
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
//保存到钥匙串
func savetoKeyChain() {
let key = "Full Name"
let value = "Steve Jobs"
let valueData = value.data(using: .utf8, allowLossyConversion: false)
let service = Bundle.main.bundleIdentifier!
let secItem = [
kSecClass as NSString : kSecClassGenericPassword as NSString,
kSecAttrService as NSString : service,
kSecAttrAccount as NSString : key,
kSecValueData as NSString : valueData!
] as NSDictionary
var result:CFTypeRef?
let status = Int(SecItemAdd(secItem, &result))
switch status {
case Int(errSecSuccess):
print("Successfully stored the value")
case Int(errSecDuplicateItem):
print("this item is already saved, Cannot duplicate it")
default:
print("An error occurred with code\(status)")
}
}
//在钥匙串中查找数据
/****查找钥匙串h中的值
SecItemCopyMatching(CFDictionary, UnsafeMutablePointer<CFTypeRef?>?)
1.构建一个字典，天剑kSecClass键，设置键的值来标识查找项的类型。 例如：kSecClassGenericPassword
2.添加kSecAttrService键。取值为查找项服务的字符串，所有应用应采用相同的值，这样任意应用写到钥匙串的数据，其他应用可以访问
3.添加kSecAttrAccount键，取值为钥匙串已存储项对应的键
4.获取特定属性的值：创建修改日期，需要向字典中添加kSecReturnAttributes,并将其值设置为kCFBooleanTrue
如果设置CFDictionary键为 kSecReturnAttributes键，则返回值为nil或CFDictionaryRef隐含类型
如果为kSecReturnData添加到字典，返回类型是CDDataRef
**/
func queryFromKeyChain(){
let keyToSearchfor = "Full Name"
let service = Bundle.main.bundleIdentifier
let query = [kSecClass as NSString : kSecClassGenericPassword as NSString,
kSecAttrAccount as NSString : keyToSearchfor,
kSecAttrService as NSString : service,
kSecReturnAttributes as NSString : kCFBooleanTrue
] as NSDictionary
var valueAttributes : CFTypeRef?
let results = Int(SecItemCopyMatching(query, &valueAttributes))
if results == Int(errSecSuccess) {
let attributes = valueAttributes! as! NSDictionary
let key = attributes[kSecAttrAccount as NSString] as! String
let accessGroup = attributes[kSecAttrAccessGroup as NSString] as! String
let createDate = attributes[kSecAttrCreationDate as NSString] as! NSDate
let modifiedDate = attributes[kSecAttrModificationDate as NSString] as! NSDate
let serviceValue = attributes[kSecAttrService as NSString] as! String
}else{
print("Error happened with code:\(results)")
}
}
func queryDataFromKeyChain(){
let keyToSearchfor = "Full Name"
let service = Bundle.main.bundleIdentifier
let query = [kSecClass as NSString : kSecClassGenericPassword as NSString,
kSecAttrAccount as NSString : keyToSearchfor,
kSecAttrService as NSString : service,
kSecReturnData as NSString : kCFBooleanTrue
] as NSDictionary
var returnedData : CFTypeRef?
let results = Int(SecItemCopyMatching(query, &returnedData))
if results == Int(errSecSuccess) {
let data = returnedData! as! Data
let value = String(data: data, encoding: .utf8)
}else{
print("Error happened with code:\(results)")
}
}
func updateKeyChain() {
let keyToSearchFor = "Full Name"
let service = Bundle.main.bundleIdentifier
let query = [kSecClass as NSString:
kSecClassGenericPassword as NSString,
kSecAttrService as NSString: service,
kSecAttrAccount as NSString : keyToSearchFor,] as NSDictionary
var result: CFTypeRef?
let found = Int(SecItemCopyMatching(query, &result))
if found == Int(errSecSuccess){
let newData = "Mark tremonti".data(using: .utf8, allowLossyConversion: false)
let update = [kSecValueData as NSString: newData!,
kSecAttrComment as NSString : "my comments"] as NSDictionary
let updated = Int(SecItemUpdate(query, update))
if updated == Int(errSecSuccess){
print("Successfully updated the existing value")
readExistingValue();
} else {
print("failed to update the value. error = \(updated)")
}
}else{
print("error happened. Code=\(found)")
}
}
//更新多个值
func readExistingValue() {
}
