keychain-swift/keychain/TegKeychain.swift

//
//  TegKeychain.swift
//  keychain
//
//  Created by Evgenii Neumerzhitckii on 5/02/2015.
//  Copyright (c) 2015 The Exchange Group Pty Ltd. All rights reserved.
//

import UIKit
import Security

class Keychain {
  
  class func save(key: String, data: NSData) -> Bool {
    let query = [
      kSecClass as String       : kSecClassGenericPassword as String,
      kSecAttrAccount as String : key,
      kSecValueData as String   : data ]
    
    SecItemDelete(query as CFDictionaryRef)
    
    let status: OSStatus = SecItemAdd(query as CFDictionaryRef, nil)
    
    return status == noErr
  }
  
  class func load(key: String) -> NSData? {
    let query = [
      kSecClass as String       : kSecClassGenericPassword,
      kSecAttrAccount as String : key,
      kSecReturnData as String  : kCFBooleanTrue,
      kSecMatchLimit as String  : kSecMatchLimitOne ]
    
    var dataTypeRef :Unmanaged<AnyObject>?
    
    let status: OSStatus = SecItemCopyMatching(query, &dataTypeRef)
    
    if status == noErr {
      return (dataTypeRef!.takeRetainedValue() as NSData)
    } else {
      return nil
    }
  }
  
  class func delete(key: String) -> Bool {
    let query = [
      kSecClass as String       : kSecClassGenericPassword,
      kSecAttrAccount as String : key ]
    
    let status: OSStatus = SecItemDelete(query as CFDictionaryRef)
    
    return status == noErr
  }
  
  
  class func clear() -> Bool {
    let query = [ kSecClass as String : kSecClassGenericPassword ]
    
    let status: OSStatus = SecItemDelete(query as CFDictionaryRef)
    
    return status == noErr
  }
  
}