Password reprompt (#1365)

* Make card number hidden

* Add support for password reprompt

* Rename PasswordPrompt to Reprompt

* Protect autofill

* Use Enums.CipherRepromptType

* Fix iOS not building

* Protect iOS autofill

* Update to match jslib

* Fix failing build

src/App/Services/MobilePasswordRepromptService.cs

@@ -0,0 +1,46 @@
+using System.Threading.Tasks;
+using Bit.Core.Abstractions;
+using Bit.App.Abstractions;
+using Bit.App.Resources;
+using System;
+
+namespace Bit.App.Services
+{
+    public class MobilePasswordRepromptService : IPasswordRepromptService
+    {
+        private readonly IPlatformUtilsService _platformUtilsService;
+        private readonly ICryptoService _cryptoService;
+
+        public MobilePasswordRepromptService(IPlatformUtilsService platformUtilsService, ICryptoService cryptoService)
+        {
+            _platformUtilsService = platformUtilsService;
+            _cryptoService = cryptoService;
+        }
+
+        public string[] ProtectedFields { get; } = { "LoginTotp", "LoginPassword", "H_FieldValue", "CardNumber", "CardCode" };
+
+        public async Task<bool> ShowPasswordPromptAsync()
+        {
+            Func<string, Task<bool>> validator = async (string password) =>
+            {
+                // Assume user has canceled.
+                if (string.IsNullOrWhiteSpace(password))
+                {
+                    return false;
+                };
+
+                var keyHash = await _cryptoService.HashPasswordAsync(password, null);
+                var storedKeyHash = await _cryptoService.GetKeyHashAsync();
+
+                if (storedKeyHash == null || keyHash == null || storedKeyHash != keyHash)
+                {
+                    return false;
+                }
+
+                return true;
+            };
+
+            return await _platformUtilsService.ShowPasswordDialogAsync(AppResources.PasswordConfirmation, AppResources.PasswordConfirmationDesc, validator);
+        }
+    }
+}