     let keyPair: KeyPair
     let applicationParameter: Data
 
-    // Key handle is application label plus 50 bytes of padding. Conformance tests require key handle to be >64 bytes.
+    // Key handle is application label plus 50 bytes of padding. Conformance
+    // tests require key handle to be >64 bytes.
     var keyHandle: Data {
         return padKeyHandle(keyPair.applicationLabel)
     }

            }
        }

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


        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.
        guard let appTag = keyPair.applicationTag else { return nil }
        applicationParameter = appTag

