Open Radar

 
n some rare situations the Local Authentication Framework API doesn't return the key data from the key chain.


example code:

    NSDictionary *query = @{
                            (__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
                            (__bridge id)kSecAttrService:keydata_keyname,
                            (__bridge id)kSecReturnData: @YES,
                            (__bridge id)kSecUseOperationPrompt: NSLocalizedString(@"unlock app", nil)
                            };
    
    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        CFTypeRef dataTypeRef = NULL;
        
        OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)(query), &dataTypeRef);
        if (status == errSecSuccess)


When touchID is working properly, status == errSecSuccess.  However, if it is not working properly errSecAuthFailed is returned and the user is not prompted to use touch ID.

Note: The problem went away when we rebooted the ipPhone 5s running IOS 8.1.2.

Steps to Reproduce:
Don't know.  It may be related to having the users finger on the touchID sensor prior to launching the app.

Expected Results:
When using secItemCopyMatching the OS should display the touchID authentication screen.  It does not.

Actual Results:
The touchID authentication screen was not presented.