从 KeyChain 保存和加载 |斯威夫特 [重复]
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【中文标题】从 KeyChain 保存和加载 |斯威夫特 [重复]【英文标题】：Save and Load from KeyChain | Swift [duplicate] 【发布时间】：2016-09-29 03:06:33 【问题描述】：如何简单地将字符串存储在钥匙串中并在需要时加载。 有几个 SO 解决方案主要是指 Git repo。但我需要最新的 Swift 上最小和最简单的解决方案。当然，我不想添加 git 框架来简单地在我的项目中存储密码。
有类似的解决方案 Save and retrieve value via KeyChain ，这对我不起作用。厌倦了编译器错误。
【问题讨论】：
【参考方案1】：##最简单的来源##
import Foundation
import Security
// Constant Identifiers
let userAccount = "AuthenticatedUser"
let accessGroup = "SecuritySerivice"
/**
* User defined keys for new entry
* Note: add new keys for new secure item and use them in load and save methods
*/
let passwordKey = "KeyForPassword"
// Arguments for the keychain queries
let kSecClassValue = NSString(format: kSecClass)
let kSecAttrAccountValue = NSString(format: kSecAttrAccount)
let kSecValueDataValue = NSString(format: kSecValueData)
let kSecClassGenericPasswordValue = NSString(format: kSecClassGenericPassword)
let kSecAttrServiceValue = NSString(format: kSecAttrService)
let kSecMatchLimitValue = NSString(format: kSecMatchLimit)
let kSecReturnDataValue = NSString(format: kSecReturnData)
let kSecMatchLimitOneValue = NSString(format: kSecMatchLimitOne)
public class KeychainService: NSObject
/**
* Exposed methods to perform save and load queries.
*/
public class func savePassword(token: NSString)
self.save(passwordKey, data: token)
public class func loadPassword() -> NSString?
return self.load(passwordKey)
/**
* Internal methods for querying the keychain.
*/
private class func save(service: NSString, data: NSString)
let dataFromString: NSData = data.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
// Instantiate a new default keychain query
let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, dataFromString], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecValueDataValue])
// Delete any existing items
SecItemDelete(keychainQuery as CFDictionaryRef)
// Add the new keychain item
SecItemAdd(keychainQuery as CFDictionaryRef, nil)
private class func load(service: NSString) -> NSString?
// Instantiate a new default keychain query
// Tell the query to return a result
// Limit our results to one item
let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, kCFBooleanTrue, kSecMatchLimitOneValue], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecReturnDataValue, kSecMatchLimitValue])
var dataTypeRef :AnyObject?
// Search for the keychain items
let status: OSStatus = SecItemCopyMatching(keychainQuery, &dataTypeRef)
var contentsOfKeychain: NSString? = nil
if status == errSecSuccess
if let retrievedData = dataTypeRef as? NSData
contentsOfKeychain = NSString(data: retrievedData, encoding: NSUTF8StringEncoding)
else
print("Nothing was retrieved from the keychain. Status code \(status)")
return contentsOfKeychain
##调用示例##
KeychainService.savePassword("Pa55worD")
let password = KeychainService.loadPassword() // password = "Pa55worD"
##SWIFT 4：具有更新和删除密码的版本
import Cocoa
import Security
// see https://***.com/a/37539998/1694526
// Arguments for the keychain queries
let kSecClassValue = NSString(format: kSecClass)
let kSecAttrAccountValue = NSString(format: kSecAttrAccount)
let kSecValueDataValue = NSString(format: kSecValueData)
let kSecClassGenericPasswordValue = NSString(format: kSecClassGenericPassword)
let kSecAttrServiceValue = NSString(format: kSecAttrService)
let kSecMatchLimitValue = NSString(format: kSecMatchLimit)
let kSecReturnDataValue = NSString(format: kSecReturnData)
let kSecMatchLimitOneValue = NSString(format: kSecMatchLimitOne)
public class KeychainService: NSObject
class func updatePassword(service: String, account:String, data: String)
if let dataFromString: Data = data.data(using: String.Encoding.utf8, allowLossyConversion: false)
// Instantiate a new default keychain query
let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, account], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue])
let status = SecItemUpdate(keychainQuery as CFDictionary, [kSecValueDataValue:dataFromString] as CFDictionary)
if (status != errSecSuccess)
if let err = SecCopyErrorMessageString(status, nil)
print("Read failed: \(err)")
class func removePassword(service: String, account:String)
// Instantiate a new default keychain query
let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, account, kCFBooleanTrue], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecReturnDataValue])
// Delete any existing items
let status = SecItemDelete(keychainQuery as CFDictionary)
if (status != errSecSuccess)
if let err = SecCopyErrorMessageString(status, nil)
print("Remove failed: \(err)")
class func savePassword(service: String, account:String, data: String)
if let dataFromString = data.data(using: String.Encoding.utf8, allowLossyConversion: false)
// Instantiate a new default keychain query
let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, account, dataFromString], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecValueDataValue])
// Add the new keychain item
let status = SecItemAdd(keychainQuery as CFDictionary, nil)
if (status != errSecSuccess) // Always check the status
if let err = SecCopyErrorMessageString(status, nil)
print("Write failed: \(err)")
class func loadPassword(service: String, account:String) -> String?
// Instantiate a new default keychain query
// Tell the query to return a result
// Limit our results to one item
let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, account, kCFBooleanTrue, kSecMatchLimitOneValue], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecReturnDataValue, kSecMatchLimitValue])
var dataTypeRef :AnyObject?
// Search for the keychain items
let status: OSStatus = SecItemCopyMatching(keychainQuery, &dataTypeRef)
var contentsOfKeychain: String?
if status == errSecSuccess
if let retrievedData = dataTypeRef as? Data
contentsOfKeychain = String(data: retrievedData, encoding: String.Encoding.utf8)
else
print("Nothing was retrieved from the keychain. Status code \(status)")
return contentsOfKeychain
您需要想象以下连接到一个文本输入字段和一个标签，然后连接四个按钮，一个用于每个方法。
class ViewController: NSViewController
@IBOutlet weak var enterPassword: NSTextField!
@IBOutlet weak var retrievedPassword: NSTextField!
let service = "myService"
let account = "myAccount"
// will only work after
@IBAction func updatePassword(_ sender: Any)
KeychainService.updatePassword(service: service, account: account, data: enterPassword.stringValue)
@IBAction func removePassword(_ sender: Any)
KeychainService.removePassword(service: service, account: account)
@IBAction func passwordSet(_ sender: Any)
let password = enterPassword.stringValue
KeychainService.savePassword(service: service, account: account, data: password)
@IBAction func passwordGet(_ sender: Any)
if let str = KeychainService.loadPassword(service: service, account: account)
retrievedPassword.stringValue = str
else retrievedPassword.stringValue = "Password does not exist"
##斯威夫特5## Kosuke 的version for swift 5
import Security
import UIKit
class KeyChain
class func save(key: String, data: Data) -> OSStatus
let query = [
kSecClass as String : kSecClassGenericPassword as String,
kSecAttrAccount as String : key,
kSecValueData as String : data ] as [String : Any]
SecItemDelete(query as CFDictionary)
return SecItemAdd(query as CFDictionary, nil)
class func load(key: String) -> Data?
let query = [
kSecClass as String : kSecClassGenericPassword,
kSecAttrAccount as String : key,
kSecReturnData as String : kCFBooleanTrue!,
kSecMatchLimit as String : kSecMatchLimitOne ] as [String : Any]
var dataTypeRef: AnyObject? = nil
let status: OSStatus = SecItemCopyMatching(query as CFDictionary, &dataTypeRef)
if status == noErr
return dataTypeRef as! Data?
else
return nil
class func createUniqueID() -> String
let uuid: CFUUID = CFUUIDCreate(nil)
let cfStr: CFString = CFUUIDCreateString(nil, uuid)
let swiftString: String = cfStr as String
return swiftString
extension Data
init<T>(from value: T)
var value = value
self.init(buffer: UnsafeBufferPointer(start: &value, count: 1))
func to<T>(type: T.Type) -> T
return self.withUnsafeBytes $0.load(as: T.self)
示例用法：
let int: Int = 555
let data = Data(from: int)
let status = KeyChain.save(key: "MyNumber", data: data)
print("status: ", status)
if let receivedData = KeyChain.load(key: "MyNumber")
let result = receivedData.to(type: Int.self)
print("result: ", result)
【讨论】：
我发现这比重复问题的答案更容易理解。我进行了编辑以包括更新，如果保存代码无法覆盖现有密码（而不是提前尝试删除），它现在会自动实现。还有一种删除密码的附加方法。你会发现在 Swift 3 中你需要对 NSString 做一些转换，这不会再自动发生，但除此之外一切都应该工作。 有人修复了删除和更新方法吗？我有同样的问题（错误代码-50） 我找到了一个更好的解决方案：github.com/dagostini/DAKeychain/blob/master/DAKeychain/Classes/…@AsiGivati 我在删除函数上遇到了 -50 OSStatus 错误，并通过在调用 SecItemDelete 之前从钥匙串查询中删除 kSecReturnDataValue 和 kSecMatchLimitValue 项来纠正它。 -50 表示传入函数的参数有问题。删除这两个为我修复了它。我假设更新函数中也存在同样的问题，但我还没有尝试过使用那个。 如果 loadPassword() 失败怎么办？我的意思是......它工作，工作，工作无数次，然后有一天它失败了（在我的例子中，一个用户每 10 天体验一次）。一个简单的重试就足够了吗？或者它可能由于需要更多参与的更严重的原因而失败？以上是关于从 KeyChain 保存和加载 |斯威夫特 [重复]的主要内容，如果未能解决你的问题，请参考以下文章
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