using CryptoSwift for sha1, getting rid of a few warnings

Podfile

@@ -11,4 +11,7 @@ target 'xdrip' do
   use_frameworks!
   pod 'SwiftCharts', '~> 0.6.5'
   
+  use_frameworks!
+  pod 'CryptoSwift', '~> 1.0'
+  
 end

Podfile.lock

@@ -1,14 +1,18 @@
 PODS:
   - ActionClosurable (1.2.0)
+  - CryptoSwift (1.2.0)
   - SwiftCharts (0.6.5)
 
 DEPENDENCIES:
   - ActionClosurable (from `https://github.com/takasek/ActionClosurable.git`)
+  - CryptoSwift (~> 1.0)
   - SwiftCharts (~> 0.6.5)
 
 SPEC REPOS:
   https://github.com/CocoaPods/Specs.git:
     - SwiftCharts
+  trunk:
+    - CryptoSwift
 
 EXTERNAL SOURCES:
   ActionClosurable:
@@ -21,8 +25,9 @@ CHECKOUT OPTIONS:
 
 SPEC CHECKSUMS:
   ActionClosurable: ff826688551b031c6bd936cb4928ebf63571893a
+  CryptoSwift: 40e374e45291d8dceedcb0d6184da94533eaabdf
   SwiftCharts: 2e755ea292f0b87d3e4b2c1eb5afc080a20cdc15
 
-PODFILE CHECKSUM: 9dee35b1fb05f0e2bf7a6c38eb6213635af56273
+PODFILE CHECKSUM: ce8e284b6b6051e2df3dac5666c212b8cf16b9f0
 
 COCOAPODS: 1.8.4

xdrip/Extensions/String.swift

@@ -1,5 +1,5 @@
 import UIKit
-import CommonCrypto
+import CryptoSwift
 
 extension String {
     //https://stackoverflow.com/questions/39677330/how-does-string-substring-work-in-swift
@@ -68,13 +68,8 @@ extension String {
 
 extension String {
     func sha1() -> String {
-        let data = Data(self.utf8)
-        var digest = [UInt8](repeating: 0, count:Int(CC_SHA1_DIGEST_LENGTH))
-        data.withUnsafeBytes {
-            _ = CC_SHA1($0, CC_LONG(data.count), &digest)
-        }
-        let hexBytes = digest.map { String(format: "%02hhx", $0) }
-        return hexBytes.joined()
+        // sha1() here is a function in CryptoSwift Library
+        return Data(self.utf8).sha1().hexEncodedString()
     }
 }
 

xdrip/View Controllers/SettingsNavigationController/SettingsViewController/M5StackSettingsViewController/M5StackSettingsViewModels/SettingsViewM5StackWiFiSettingsViewModel.swift

@@ -145,9 +145,6 @@ struct SettingsViewM5StackWiFiSettingsViewModel: SettingsViewModelProtocol {
             text = UserDefaults.standard.m5StackWiFiPassword3
             actionHandler = {(password:String) in UserDefaults.standard.m5StackWiFiPassword3 = password.toNilIfLength0()}
             titlePart = Texts_Common.password
-        default:
-            // keep the default even if it gives a warning, just in case we add cases which are not processed here but which need processing
-            fatalError("createSettingsSelectedRowActionForWifiName, invalid wifiNumber")
         }
         
         return SettingsSelectedRowAction.askText(title: Texts_Common.WiFi + " " + titlePart + " " + wifiNumberAsInt!.description, message: nil, keyboardType: .default, text: text, placeHolder: "", actionTitle: nil, cancelTitle: nil, actionHandler: actionHandler!, cancelHandler: nil)