Fixed setting LAContext (may only be set when saving item)

ui/BankingiOSApp/BankingiOSApp/Security/AuthenticationService.swift

@@ -160,9 +160,8 @@ class AuthenticationService {
                                                             .userPresence,
                                                             nil) // Ignore any error.
             
-            // TODO: this does not work yet, setting LAContext results in a "unexpectedPasswordData" error
-//            context = LAContext()
-//            context?.touchIDAuthenticationAllowableReuseDuration = 45
+            context = LAContext()
+            context?.touchIDAuthenticationAllowableReuseDuration = 45
         }
         
         return KeychainPasswordItem(service: Self.DefaultPasswordKeychainAccountName, account: nil, accessGroup: nil, secAccessControl: accessControl, authenticationContext: context)

ui/BankingiOSApp/BankingiOSApp/Security/KeychainPasswordItem.swift

@@ -135,7 +135,12 @@ struct KeychainPasswordItem {
             var attributesToUpdate = [String : AnyObject]()
             attributesToUpdate[kSecValueData as String] = encodedPassword as AnyObject?
 
-            let query = keychainQuery()
+            var query = keychainQuery()
+            
+            if let authenticationContext = authenticationContext {
+                query[kSecUseAuthenticationContext as String] = authenticationContext
+            }
+            
             let status = SecItemUpdate(query as CFDictionary, attributesToUpdate as CFDictionary)
             
             // Throw an error if an unexpected status was returned.
@@ -198,10 +203,6 @@ struct KeychainPasswordItem {
             query[kSecAttrAccessControl as String] = accessControl as AnyObject?
         }
         
-        if let authenticationContext = authenticationContext {
-            query[kSecUseAuthenticationContext as String] = authenticationContext
-        }
-        
         return query
     }