         guard let kp = KeyPair(label: U2FRegistration.namespace, appLabel: appLabel, signPrompt: prompt) else { return nil }
         keyPair = kp
 
-        // Read our application parameter from the keychain and make sure it matches.
+        // Read our application parameter from the keychain and make sure it
+        // matches.
         guard let appTag = keyPair.applicationTag else { return nil }
         applicationParameter = appTag
 


    // Generate a new registration.
    init?(applicationParameter ap: Data, inSEP sep: Bool) {
        // TODO Specify applicationTag during creation. Alternatively, detect if setting tag fails.
        guard let kp = KeyPair(label: U2FRegistration.namespace, inSEP: sep) else { return nil }
        kp.applicationTag = ap


            }
        }

        // Use the highest per-registration counter value plus one as our global
        // counter value.
        if maxCtr > 0 {
            Counter.current = maxCtr + 1
        }
    }

