Adding item to keychain using Swift

Question

I\'m trying to add an item to the iOS keychain using Swift but can\'t figure out how to type cast properly. From WWDC 2013 session 709, given the following Objective-C code:

Answer 1

This seemed to work fine or at least compiler didn't have kittens - UNTESTED beyond that

        var secret: NSData = "Top Secret".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
        var array1 = NSArray(objects:"\(kSecClassGenericPassword)", "MyService", "Some account", secret)
        var array2 = NSArray(objects:"\(kSecClass)","\(kSecAttrService)", "\(kSecAttrAccount)","\(kSecValueData)")
        let query = NSDictionary(objects: array1, forKeys: array2)
        println(query)
        let status  = SecItemAdd(query as CFDictionaryRef, nil)

Seems to work fine in Beta 2

Answer 2

Swift 3

let kSecClassKey = String(kSecClass)
let kSecAttrAccountKey = String(kSecAttrAccount)
let kSecValueDataKey = String(kSecValueData)
let kSecClassGenericPasswordKey = String(kSecClassGenericPassword)
let kSecAttrServiceKey = String(kSecAttrService)
let kSecMatchLimitKey = String(kSecMatchLimit)
let kSecReturnDataKey = String(kSecReturnData)
let kSecMatchLimitOneKey = String(kSecMatchLimitOne)

you can also do it inside the dictionary itself alá:

var query: [String: Any] = [
    String(kSecClass): kSecClassGenericPassword,
    String(kSecAttrService): "MyService",
    String(kSecAttrAccount): "Some account",
    String(kSecValueData): secret
]

however, this is more expensive for the compiler, even more so since you're probably using the query in multiple places.

Answer 3

In the xcode 6.0.1 you must do this!!

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)

Answer 4

You simply need to downcast the literal:

let dict = ["hi": "Pasan"] as NSDictionary

Now dict is an NSDictionary. To make a mutable one, it's very similar to Objective-C:

let mDict = dict.mutableCopy() as NSMutableDictionary
mDict["hola"] = "Ben"

Answer 5

In order to get this to work, you need to access the retained values of the keychain constants instead. For example:

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

You can then reference the values in the MSMutableDictionary like so:

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

I wrote a blog post about it at: http://rshelby.com/2014/08/using-swift-to-save-and-query-ios-keychain-in-xcode-beta-4/

Hope this helps!

rshelby

Answer 6

more convenient to use the cocoa pods SSKeychain

+ (NSArray *)allAccounts;
+ (NSArray *)accountsForService:(NSString *)serviceName;
+ (NSString *)passwordForService:(NSString *)serviceName account:(NSString *)account;
+ (BOOL)deletePasswordForService:(NSString *)serviceName account:(NSString *)account;
+ (BOOL)setPassword:(NSString *)password forService:(NSString *)serviceName account:(NSString *)account;