Getting Optional(“”) when trying to get value from KeyChain

Question

When I try to get my keyChain value, it return a string containing:

Optional(\"[thing in the KeyChain]\")

so, I tried to remove \"Optiona

Answer 1

Here is a Swift 2 example implementation:

import Security

class ZLKeychainService: NSObject {

    var service = "Service"
    var keychainQuery :[NSString: AnyObject]! = nil

    func save(name name: NSString, value: NSString) -> OSStatus? {
        let statusAdd :OSStatus?

        guard let dataFromString: NSData = value.dataUsingEncoding(NSUTF8StringEncoding) else {
            return nil
        }

        keychainQuery = [
            kSecClass       : kSecClassGenericPassword,
            kSecAttrService : service,
            kSecAttrAccount : name,
            kSecValueData   : dataFromString]
        if keychainQuery == nil {
            return nil
        }

        SecItemDelete(keychainQuery as CFDictionaryRef)

        statusAdd = SecItemAdd(keychainQuery! as CFDictionaryRef, nil)

        return statusAdd;
    }

    func load(name name: NSString) -> String? {
        var contentsOfKeychain :String?

        keychainQuery = [
            kSecClass       : kSecClassGenericPassword,
            kSecAttrService : service,
            kSecAttrAccount : name,
            kSecReturnData  : kCFBooleanTrue,
            kSecMatchLimit  : kSecMatchLimitOne]
        if keychainQuery == nil {
            return nil
        }

        var dataTypeRef: AnyObject?
        let status: OSStatus = SecItemCopyMatching(keychainQuery, &dataTypeRef)

        if (status == errSecSuccess) {
            let retrievedData: NSData? = dataTypeRef as? NSData
            if let result = NSString(data: retrievedData!, encoding: NSUTF8StringEncoding) {
                contentsOfKeychain = result as String
            }
        }
        else {
            print("Nothing was retrieved from the keychain. Status code \(status)")
        }

        return contentsOfKeychain
    }
}

//Test:
let userName = "TestUser"
let userValue: NSString = "TestValue"
print("userName: '\(userName)'")
print("userValue: '\(userValue)'")

let kcs = ZLKeychainService()

kcs.save(name:userName, value: userValue)
print("Keychain Query \(kcs.keychainQuery)")

if let recoveredToken = kcs.load(name:userName) {
    print("Recovered Value: '\(recoveredToken)'")
}

Output:

userName: 'TestUser'
userValue: 'TestValue'
Keychain Query [acct: TestUser, v_Data: <54657374 56616c75 65>, svce: Service, class: genp]
Recovered Value: 'TestValue'