KeyChainからの保存と読み込み| Swift
単純に文字列をキーチェーンに保存し、必要なときにロードする方法。いくつかのSOソリューションは主にGitリポジトリを参照します。しかし、最新のSwiftで最小かつ最も簡単なソリューションが必要です。確かに、単にパスワードを保存するためのgitフレームワークを追加したくない私のプロジェクトで。
同様の解決策があります KeyChain経由で値を保存および取得 、これは私にとってはうまくいきませんでした。コンパイラエラーでうんざり。
最も単純なソース
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
}
}
呼び出しの例
KeychainService.savePassword("Pa55Word")
let password = KeychainService.loadPassword() // password = "Pa55Word"
Swift 4：バージョンの更新とパスワードの削除
import Cocoa
import Security
// see https://stackoverflow.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
}
}
テキスト入力フィールドとラベルに配線された次のものを想像し、各メソッドに1つずつ、4つのボタンが配線されていることを想像する必要があります。
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" }
}
}