[PS-2358] Add kdf configuration options (#2328)

* Implement kdf configuration

* Remove unused import

* Move kdf parameters to kdfConfiguration struct

* Remove unused state migration service keys

* Revert newline changes in PCLCryptoFunctionService

* Update KdfConfiguration.cs

* Add checks for argon2, clean statemigration service

* Update constants

* Clean up code

* Further cleanup

* Change KdfType to non-nullable in SetKeyConnectorKeyRequest

---------

Co-authored-by: Kyle Spearrin <kspearrin@users.noreply.github.com>

src/App/Pages/Accounts/LockPageViewModel.cs

@@ -228,8 +228,7 @@ namespace Bit.App.Pages
             }
 
             ShowPassword = false;
-            var kdf = await _stateService.GetKdfTypeAsync();
+            var kdfConfig = await _stateService.GetActiveUserCustomDataAsync(a => new KdfConfig(a?.Profile));
-            var kdfIterations = await _stateService.GetKdfIterationsAsync();
 
             if (PinLock)
             {
@@ -239,7 +238,7 @@ namespace Bit.App.Pages
                     if (_isPinProtected)
                     {
                         var key = await _cryptoService.MakeKeyFromPinAsync(Pin, _email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000),
+                            kdfConfig,
                             await _stateService.GetPinProtectedKeyAsync());
                         var encKey = await _cryptoService.GetEncKeyAsync(key);
                         var protectedPin = await _stateService.GetProtectedPinAsync();
@@ -254,8 +253,7 @@ namespace Bit.App.Pages
                     }
                     else
                     {
-                        var key = await _cryptoService.MakeKeyFromPinAsync(Pin, _email,
+                        var key = await _cryptoService.MakeKeyFromPinAsync(Pin, _email, kdfConfig);
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000));
                         failed = false;
                         Pin = string.Empty;
                         await AppHelpers.ResetInvalidUnlockAttemptsAsync();
@@ -280,7 +278,7 @@ namespace Bit.App.Pages
             }
             else
             {
-                var key = await _cryptoService.MakeKeyAsync(MasterPassword, _email, kdf, kdfIterations);
+                var key = await _cryptoService.MakeKeyAsync(MasterPassword, _email, kdfConfig);
                 var storedKeyHash = await _cryptoService.GetKeyHashAsync();
                 var passwordValid = false;
 
@@ -314,8 +312,7 @@ namespace Bit.App.Pages
                         var protectedPin = await _stateService.GetProtectedPinAsync();
                         var encKey = await _cryptoService.GetEncKeyAsync(key);
                         var decPin = await _cryptoService.DecryptToUtf8Async(new EncString(protectedPin), encKey);
-                        var pinKey = await _cryptoService.MakePinKeyAysnc(decPin, _email,
+                        var pinKey = await _cryptoService.MakePinKeyAysnc(decPin, _email, kdfConfig);
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000));
                         await _stateService.SetPinProtectedKeyAsync(await _cryptoService.EncryptAsync(key.Key, pinKey));
                     }
                     MasterPassword = string.Empty;

src/App/Pages/Accounts/RegisterPageViewModel.cs

@@ -175,8 +175,8 @@ namespace Bit.App.Pages
 
             Name = string.IsNullOrWhiteSpace(Name) ? null : Name;
             Email = Email.Trim().ToLower();
-            var kdf = KdfType.PBKDF2_SHA256;
+            var kdfConfig = new KdfConfig(KdfType.PBKDF2_SHA256, Constants.Pbkdf2Iterations, null, null);
-            var key = await _cryptoService.MakeKeyAsync(MasterPassword, Email, kdf, Constants.KdfIterations);
+            var key = await _cryptoService.MakeKeyAsync(MasterPassword, Email, kdfConfig);
             var encKey = await _cryptoService.MakeEncKeyAsync(key);
             var hashedPassword = await _cryptoService.HashPasswordAsync(MasterPassword, key);
             var keys = await _cryptoService.MakeKeyPairAsync(encKey.Item1);
@@ -187,8 +187,10 @@ namespace Bit.App.Pages
                 MasterPasswordHash = hashedPassword,
                 MasterPasswordHint = Hint,
                 Key = encKey.Item2.EncryptedString,
-                Kdf = kdf,
+                Kdf = kdfConfig.Type,
-                KdfIterations = Constants.KdfIterations,
+                KdfIterations = kdfConfig.Iterations,
+                KdfMemory = kdfConfig.Memory,
+                KdfParallelism = kdfConfig.Parallelism,
                 Keys = new KeysRequest
                 {
                     PublicKey = keys.Item1,

src/App/Pages/Accounts/SetPasswordPageViewModel.cs

@@ -163,9 +163,9 @@ namespace Bit.App.Pages
                 return;
             }
 
-            var kdf = KdfType.PBKDF2_SHA256;
+            var kdfConfig = new KdfConfig(KdfType.PBKDF2_SHA256, Constants.Pbkdf2Iterations, null, null);
             var email = await _stateService.GetEmailAsync();
-            var key = await _cryptoService.MakeKeyAsync(MasterPassword, email, kdf, Constants.KdfIterations);
+            var key = await _cryptoService.MakeKeyAsync(MasterPassword, email, kdfConfig);
             var masterPasswordHash = await _cryptoService.HashPasswordAsync(MasterPassword, key, HashPurpose.ServerAuthorization);
             var localMasterPasswordHash = await _cryptoService.HashPasswordAsync(MasterPassword, key, HashPurpose.LocalAuthorization);
 
@@ -186,8 +186,10 @@ namespace Bit.App.Pages
                 MasterPasswordHash = masterPasswordHash,
                 Key = encKey.Item2.EncryptedString,
                 MasterPasswordHint = Hint,
-                Kdf = kdf,
+                Kdf = kdfConfig.Type.GetValueOrDefault(KdfType.PBKDF2_SHA256),
-                KdfIterations = Constants.KdfIterations,
+                KdfIterations = kdfConfig.Iterations.GetValueOrDefault(Constants.Pbkdf2Iterations),
+                KdfMemory = kdfConfig.Memory,
+                KdfParallelism = kdfConfig.Parallelism,
                 OrgIdentifier = OrgIdentifier,
                 Keys = new KeysRequest
                 {
@@ -201,8 +203,7 @@ namespace Bit.App.Pages
                 await _deviceActionService.ShowLoadingAsync(AppResources.CreatingAccount);
                 // Set Password and relevant information
                 await _apiService.SetPasswordAsync(request);
-                await _stateService.SetKdfTypeAsync(kdf);
+                await _stateService.SetKdfConfigurationAsync(kdfConfig);
-                await _stateService.SetKdfIterationsAsync(Constants.KdfIterations);
                 await _cryptoService.SetKeyAsync(key);
                 await _cryptoService.SetKeyHashAsync(localMasterPasswordHash);
                 await _cryptoService.SetEncKeyAsync(encKey.Item2.EncryptedString);

src/App/Pages/Accounts/UpdateTempPasswordPageViewModel.cs

@@ -43,12 +43,11 @@ namespace Bit.App.Pages
             }
 
             // Retrieve details for key generation
-            var kdf = await _stateService.GetKdfTypeAsync();
+            var kdfConfig = await _stateService.GetActiveUserCustomDataAsync(a => new KdfConfig(a?.Profile));
-            var kdfIterations = await _stateService.GetKdfIterationsAsync();
             var email = await _stateService.GetEmailAsync();
 
             // Create new key and hash new password
-            var key = await _cryptoService.MakeKeyAsync(MasterPassword, email, kdf, kdfIterations);
+            var key = await _cryptoService.MakeKeyAsync(MasterPassword, email, kdfConfig);
             var masterPasswordHash = await _cryptoService.HashPasswordAsync(MasterPassword, key);
 
             // Create new encKey for the User

src/App/Pages/Settings/SettingsPage/SettingsPageViewModel.cs

@@ -422,12 +422,9 @@ namespace Bit.App.Pages
                             AppResources.Yes, AppResources.No);
                     }
 
-                    var kdf = await _stateService.GetKdfTypeAsync();
+                    var kdfConfig = await _stateService.GetActiveUserCustomDataAsync(a => new KdfConfig(a?.Profile));
-                    var kdfIterations = await _stateService.GetKdfIterationsAsync();
                     var email = await _stateService.GetEmailAsync();
-                    var pinKey = await _cryptoService.MakePinKeyAysnc(pin, email,
+                    var pinKey = await _cryptoService.MakePinKeyAysnc(pin, email, kdfConfig);
-                        kdf.GetValueOrDefault(Core.Enums.KdfType.PBKDF2_SHA256),
-                        kdfIterations.GetValueOrDefault(5000));
                     var key = await _cryptoService.GetKeyAsync();
                     var pinProtectedKey = await _cryptoService.EncryptAsync(key.Key, pinKey);
 

src/Core/Abstractions/ICryptoService.cs

@@ -36,11 +36,10 @@ namespace Bit.Core.Abstractions
         Task<string> HashPasswordAsync(string password, SymmetricCryptoKey key, HashPurpose hashPurpose = HashPurpose.ServerAuthorization);
         Task<bool> HasKeyAsync(string userId = null);
         Task<Tuple<SymmetricCryptoKey, EncString>> MakeEncKeyAsync(SymmetricCryptoKey key);
-        Task<SymmetricCryptoKey> MakeKeyAsync(string password, string salt, KdfType? kdf, int? kdfIterations);
+        Task<SymmetricCryptoKey> MakeKeyAsync(string password, string salt, KdfConfig config);
-        Task<SymmetricCryptoKey> MakeKeyFromPinAsync(string pin, string salt, KdfType kdf, int kdfIterations,
+        Task<SymmetricCryptoKey> MakeKeyFromPinAsync(string pin, string salt, KdfConfig config, EncString protectedKeyEs = null);
-            EncString protectedKeyEs = null);
         Task<Tuple<string, EncString>> MakeKeyPairAsync(SymmetricCryptoKey key = null);
-        Task<SymmetricCryptoKey> MakePinKeyAysnc(string pin, string salt, KdfType kdf, int kdfIterations);
+        Task<SymmetricCryptoKey> MakePinKeyAysnc(string pin, string salt, KdfConfig config);
         Task<Tuple<EncString, SymmetricCryptoKey>> MakeShareKeyAsync();
         Task<SymmetricCryptoKey> MakeSendKeyAsync(byte[] keyMaterial);
         Task<int> RandomNumberAsync(int min, int max);

src/Core/Abstractions/IStateService.cs

@@ -37,10 +37,7 @@ namespace Bit.Core.Abstractions
         Task SetPinProtectedAsync(string value, string userId = null);
         Task<EncString> GetPinProtectedKeyAsync(string userId = null);
         Task SetPinProtectedKeyAsync(EncString value, string userId = null);
-        Task<KdfType?> GetKdfTypeAsync(string userId = null);
+        Task SetKdfConfigurationAsync(KdfConfig config, string userId = null);
-        Task SetKdfTypeAsync(KdfType? value, string userId = null);
-        Task<int?> GetKdfIterationsAsync(string userId = null);
-        Task SetKdfIterationsAsync(int? value, string userId = null);
         Task<string> GetKeyEncryptedAsync(string userId = null);
         Task SetKeyEncryptedAsync(string value, string userId = null);
         Task<SymmetricCryptoKey> GetKeyDecryptedAsync(string userId = null);

src/Core/Constants.cs

@@ -46,7 +46,10 @@
         public const int SaveFileRequestCode = 44;
         public const int TotpDefaultTimer = 30;
         public const int PasswordlessNotificationTimeoutInMinutes = 15;
-        public const int KdfIterations = 600000;
+        public const int Pbkdf2Iterations = 600000;
+        public const int Argon2Iterations = 3;
+        public const int Argon2MemoryInMB = 64;
+        public const int Argon2Parallelism = 4;
         public const int MasterPasswordMinimumChars = 8;
 
         public static readonly string[] AndroidAllClearCipherCacheKeys =

src/Core/Models/Domain/Account.cs

@@ -46,6 +46,8 @@ namespace Bit.Core.Models.Domain
                 OrgIdentifier = copy.OrgIdentifier;
                 KdfType = copy.KdfType;
                 KdfIterations = copy.KdfIterations;
+                KdfMemory = copy.KdfMemory;
+                KdfParallelism = copy.KdfParallelism;
                 EmailVerified = copy.EmailVerified;
                 HasPremiumPersonally = copy.HasPremiumPersonally;
                 AvatarColor = copy.AvatarColor;
@@ -59,6 +61,8 @@ namespace Bit.Core.Models.Domain
             public string AvatarColor;
             public KdfType? KdfType;
             public int? KdfIterations;
+            public int? KdfMemory;
+            public int? KdfParallelism;
             public bool? EmailVerified;
             public bool? HasPremiumPersonally;
         }

src/Core/Models/Domain/KdfConfiguration.cs

@@ -0,0 +1,27 @@
+using Bit.Core;
+using Bit.Core.Enums;
+using Bit.Core.Models.Domain;
+public struct KdfConfig
+{
+    public static KdfConfig Default = new KdfConfig(KdfType.PBKDF2_SHA256, 5000, null, null);
+    public KdfConfig(KdfType? type, int? iterations, int? memory, int? parallelism)
+    {
+        Type = type;
+        Iterations = iterations;
+        Memory = memory;
+        Parallelism = parallelism;
+    }
+
+    public KdfConfig(Account.AccountProfile profile)
+    {
+        Type = profile.KdfType;
+        Iterations = profile.KdfIterations;
+        Memory = profile.KdfMemory;
+        Parallelism = profile.KdfParallelism;
+    }
+
+    public KdfType? Type { get; set; }
+    public int? Iterations { get; set; }
+    public int? Memory { get; set; }
+    public int? Parallelism { get; set; }
+}

src/Core/Models/Request/RegisterRequest.cs

@@ -15,6 +15,8 @@ namespace Bit.Core.Models.Request
         public Guid? OrganizationUserId { get; set; }
         public KdfType? Kdf { get; set; }
         public int? KdfIterations { get; set; }
+        public int? KdfMemory { get; set; }
+        public int? KdfParallelism { get; set; }
         public string CaptchaResponse { get; set; }
     }
 }

src/Core/Models/Request/SetKeyConnectorKeyRequest.cs

@@ -9,15 +9,18 @@ namespace Bit.Core.Models.Request
         public KeysRequest Keys { get; set; }
         public KdfType Kdf { get; set; }
         public int? KdfIterations { get; set; }
+        public int? KdfMemory { get; set; }
+        public int? KdfParallelism { get; set; }
         public string OrgIdentifier { get; set; }
 
-        public SetKeyConnectorKeyRequest(string key, KeysRequest keys,
+        public SetKeyConnectorKeyRequest(string key, KeysRequest keys, KdfConfig kdfConfig, string orgIdentifier)
-            KdfType kdf, int? kdfIterations, string orgIdentifier)
         {
             this.Key = key;
             this.Keys = keys;
-            this.Kdf = kdf;
+            this.Kdf = kdfConfig.Type.GetValueOrDefault(KdfType.PBKDF2_SHA256);
-            this.KdfIterations = kdfIterations;
+            this.KdfIterations = kdfConfig.Iterations;
+            this.KdfMemory = kdfConfig.Memory;
+            this.KdfParallelism = kdfConfig.Parallelism;
             this.OrgIdentifier = orgIdentifier;
         }
     }

src/Core/Models/Request/SetPasswordRequest.cs

@@ -10,6 +10,8 @@ namespace Bit.Core.Models.Request
         public KeysRequest Keys { get; set; }
         public KdfType Kdf { get; set; }
         public int KdfIterations { get; set; }
+        public int? KdfMemory { get; set; }
+        public int? KdfParallelism { get; set; }
         public string OrgIdentifier { get; set; }
     }
 }

src/Core/Models/Response/IdentityTokenResponse.cs

@@ -20,7 +20,11 @@ namespace Bit.Core.Models.Response
         public string TwoFactorToken { get; set; }
         public KdfType Kdf { get; set; }
         public int? KdfIterations { get; set; }
+        public int? KdfMemory { get; set; }
+        public int? KdfParallelism { get; set; }
         public bool ForcePasswordReset { get; set; }
         public string KeyConnectorUrl { get; set; }
+        [JsonIgnore]
+        public KdfConfig KdfConfig => new KdfConfig(Kdf, KdfIterations, KdfMemory, KdfParallelism);
     }
 }

src/Core/Models/Response/PreloginResponse.cs

@@ -1,4 +1,5 @@
 using Bit.Core.Enums;
+using Newtonsoft.Json;
 
 namespace Bit.Core.Models.Response
 {
@@ -6,5 +7,9 @@ namespace Bit.Core.Models.Response
     {
         public KdfType Kdf { get; set; }
         public int KdfIterations { get; set; }
+        public int? KdfMemory { get; set; }
+        public int? KdfParallelism { get; set; }
+        [JsonIgnore]
+        public KdfConfig KdfConfig => new KdfConfig(Kdf, KdfIterations, KdfMemory, KdfParallelism);
     }
 }

src/Core/Services/AuthService.cs

@@ -276,15 +276,13 @@ namespace Bit.Core.Services
         private async Task<SymmetricCryptoKey> MakePreloginKeyAsync(string masterPassword, string email)
         {
             email = email.Trim().ToLower();
-            KdfType? kdf = null;
+            KdfConfig kdfConfig = KdfConfig.Default;
-            int? kdfIterations = null;
             try
             {
                 var preloginResponse = await _apiService.PostPreloginAsync(new PreloginRequest { Email = email });
                 if (preloginResponse != null)
                 {
-                    kdf = preloginResponse.Kdf;
+                    kdfConfig = preloginResponse.KdfConfig;
-                    kdfIterations = preloginResponse.KdfIterations;
                 }
             }
             catch (ApiException e)
@@ -294,7 +292,7 @@ namespace Bit.Core.Services
                     throw;
                 }
             }
-            return await _cryptoService.MakeKeyAsync(masterPassword, email, kdf, kdfIterations);
+            return await _cryptoService.MakeKeyAsync(masterPassword, email, kdfConfig);
         }
 
         private async Task<AuthResult> LogInHelperAsync(string email, string hashedPassword, string localHashedPassword,
@@ -442,7 +440,7 @@ namespace Bit.Core.Services
                 {
                     // SSO Key Connector Onboarding
                     var password = await _cryptoFunctionService.RandomBytesAsync(64);
-                    var k = await _cryptoService.MakeKeyAsync(Convert.ToBase64String(password), _tokenService.GetEmail(), tokenResponse.Kdf, tokenResponse.KdfIterations);
+                    var k = await _cryptoService.MakeKeyAsync(Convert.ToBase64String(password), _tokenService.GetEmail(), tokenResponse.KdfConfig);
                     var keyConnectorRequest = new KeyConnectorUserKeyRequest(k.EncKeyB64);
                     await _cryptoService.SetKeyAsync(k);
 
@@ -465,7 +463,7 @@ namespace Bit.Core.Services
                         EncryptedPrivateKey = keyPair.Item2.EncryptedString
                     };
                     var setPasswordRequest = new SetKeyConnectorKeyRequest(
-                        encKey.Item2.EncryptedString, keys, tokenResponse.Kdf, tokenResponse.KdfIterations, orgId
+                        encKey.Item2.EncryptedString, keys, tokenResponse.KdfConfig, orgId
                     );
                     await _apiService.PostSetKeyConnectorKey(setPasswordRequest);
                 }

src/Core/Services/CryptoService.cs

@@ -389,30 +389,46 @@ namespace Bit.Core.Services
             await SetKeyAsync(key);
         }
 
-        public async Task<SymmetricCryptoKey> MakeKeyAsync(string password, string salt,
+        public async Task<SymmetricCryptoKey> MakeKeyAsync(string password, string salt, KdfConfig kdfConfig)
-            KdfType? kdf, int? kdfIterations)
         {
             byte[] key = null;
-            if (kdf == null || kdf == KdfType.PBKDF2_SHA256)
+            if (kdfConfig.Type == null || kdfConfig.Type == KdfType.PBKDF2_SHA256)
             {
-                if (kdfIterations == null)
+                var iterations = kdfConfig.Iterations.GetValueOrDefault(5000);
-                {
+                if (iterations < 5000)
-                    kdfIterations = 5000;
-                }
-                if (kdfIterations < 5000)
                 {
                     throw new Exception("PBKDF2 iteration minimum is 5000.");
                 }
                 key = await _cryptoFunctionService.Pbkdf2Async(password, salt,
-                    CryptoHashAlgorithm.Sha256, kdfIterations.Value);
+                    CryptoHashAlgorithm.Sha256, iterations);
             }
-            else if (kdf == KdfType.Argon2id)
+            else if (kdfConfig.Type == KdfType.Argon2id)
             {
-                var iterations = kdfIterations.Value;
+                var iterations = kdfConfig.Iterations.GetValueOrDefault(Constants.Argon2Iterations);
-                const int parallelism = 1;
+                var memory = kdfConfig.Memory.GetValueOrDefault(Constants.Argon2MemoryInMB) * 1024;
-                const int memory = 1024 * 16; // 16 MiB
+                var parallelism = kdfConfig.Parallelism.GetValueOrDefault(Constants.Argon2Parallelism);
 
-                key = await _cryptoFunctionService.Argon2Async(password, salt, iterations, memory, parallelism);
+                if (kdfConfig.Iterations < 2)
+                {
+                    throw new Exception("Argon2 iterations minimum is 2");
+                }
+
+                if (kdfConfig.Memory < 16)
+                {
+                    throw new Exception("Argon2 memory minimum is 16 MB");
+                }
+                else if (kdfConfig.Memory > 1024)
+                {
+                    throw new Exception("Argon2 memory maximum is 1024 MB");
+                }
+
+                if (kdfConfig.Parallelism < 1)
+                {
+                    throw new Exception("Argon2 parallelism minimum is 1");
+                }
+
+                var saltHash = await _cryptoFunctionService.HashAsync(salt, CryptoHashAlgorithm.Sha256);
+                key = await _cryptoFunctionService.Argon2Async(password, saltHash, iterations, memory, parallelism);
             }
             else
             {
@@ -422,7 +438,7 @@ namespace Bit.Core.Services
         }
 
         public async Task<SymmetricCryptoKey> MakeKeyFromPinAsync(string pin, string salt,
-            KdfType kdf, int kdfIterations, EncString protectedKeyCs = null)
+            KdfConfig config, EncString protectedKeyCs = null)
         {
             if (protectedKeyCs == null)
             {
@@ -433,7 +449,7 @@ namespace Bit.Core.Services
                 }
                 protectedKeyCs = new EncString(pinProtectedKey);
             }
-            var pinKey = await MakePinKeyAysnc(pin, salt, kdf, kdfIterations);
+            var pinKey = await MakePinKeyAysnc(pin, salt, config);
             var decKey = await DecryptToBytesAsync(protectedKeyCs, pinKey);
             return new SymmetricCryptoKey(decKey);
         }
@@ -454,9 +470,9 @@ namespace Bit.Core.Services
             return new Tuple<string, EncString>(publicB64, privateEnc);
         }
 
-        public async Task<SymmetricCryptoKey> MakePinKeyAysnc(string pin, string salt, KdfType kdf, int kdfIterations)
+        public async Task<SymmetricCryptoKey> MakePinKeyAysnc(string pin, string salt, KdfConfig config)
         {
-            var pinKey = await MakeKeyAsync(pin, salt, kdf, kdfIterations);
+            var pinKey = await MakeKeyAsync(pin, salt, config);
             return await StretchKeyAsync(pinKey);
         }
 

src/Core/Services/StateService.cs

@@ -339,35 +339,15 @@ namespace Bit.Core.Services
             await SaveAccountAsync(account, reconciledOptions);
         }
 
-        public async Task<KdfType?> GetKdfTypeAsync(string userId = null)
+        public async Task SetKdfConfigurationAsync(KdfConfig config, string userId = null)
-        {
-            return (await GetAccountAsync(
-                ReconcileOptions(new StorageOptions { UserId = userId }, await GetDefaultStorageOptionsAsync())
-            ))?.Profile?.KdfType;
-        }
-
-        public async Task SetKdfTypeAsync(KdfType? value, string userId = null)
         {
             var reconciledOptions = ReconcileOptions(new StorageOptions { UserId = userId },
                 await GetDefaultStorageOptionsAsync());
             var account = await GetAccountAsync(reconciledOptions);
-            account.Profile.KdfType = value;
+            account.Profile.KdfType = config.Type;
-            await SaveAccountAsync(account, reconciledOptions);
+            account.Profile.KdfIterations = config.Iterations;
-        }
+            account.Profile.KdfMemory = config.Memory;
-
+            account.Profile.KdfParallelism = config.Parallelism;
-        public async Task<int?> GetKdfIterationsAsync(string userId = null)
-        {
-            return (await GetAccountAsync(
-                ReconcileOptions(new StorageOptions { UserId = userId }, await GetDefaultStorageOptionsAsync())
-            ))?.Profile?.KdfIterations;
-        }
-
-        public async Task SetKdfIterationsAsync(int? value, string userId = null)
-        {
-            var reconciledOptions = ReconcileOptions(new StorageOptions { UserId = userId },
-                await GetDefaultStorageOptionsAsync());
-            var account = await GetAccountAsync(reconciledOptions);
-            account.Profile.KdfIterations = value;
             await SaveAccountAsync(account, reconciledOptions);
         }
 

src/iOS.Core/Controllers/BaseLockPasswordViewController.cs

@@ -221,8 +221,7 @@ namespace Bit.iOS.Core.Controllers
             }
 
             var email = await _stateService.GetEmailAsync();
-            var kdf = await _stateService.GetKdfTypeAsync();
+            var kdfConfig = await _stateService.GetActiveUserCustomDataAsync(a => new KdfConfig(a?.Profile));
-            var kdfIterations = await _stateService.GetKdfIterationsAsync();
             var inputtedValue = MasterPasswordCell.TextField.Text;
 
             if (_pinLock)
@@ -233,7 +232,7 @@ namespace Bit.iOS.Core.Controllers
                     if (_isPinProtected)
                     {
                         var key = await _cryptoService.MakeKeyFromPinAsync(inputtedValue, email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000),
+                            kdfConfig,
                             await _stateService.GetPinProtectedKeyAsync());
                         var encKey = await _cryptoService.GetEncKeyAsync(key);
                         var protectedPin = await _stateService.GetProtectedPinAsync();
@@ -248,7 +247,7 @@ namespace Bit.iOS.Core.Controllers
                     else
                     {
                         var key2 = await _cryptoService.MakeKeyFromPinAsync(inputtedValue, email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000));
+                            kdfConfig);
                         failed = false;
                         await AppHelpers.ResetInvalidUnlockAttemptsAsync();
                         await SetKeyAndContinueAsync(key2);
@@ -265,7 +264,7 @@ namespace Bit.iOS.Core.Controllers
             }
             else
             {
-                var key2 = await _cryptoService.MakeKeyAsync(inputtedValue, email, kdf, kdfIterations);
+                var key2 = await _cryptoService.MakeKeyAsync(inputtedValue, email, kdfConfig);
 
                 var storedKeyHash = await _cryptoService.GetKeyHashAsync();
                 if (storedKeyHash == null)
@@ -287,7 +286,7 @@ namespace Bit.iOS.Core.Controllers
                         var encKey = await _cryptoService.GetEncKeyAsync(key2);
                         var decPin = await _cryptoService.DecryptToUtf8Async(new EncString(protectedPin), encKey);
                         var pinKey = await _cryptoService.MakePinKeyAysnc(decPin, email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000));
+                            kdfConfig);
                         await _stateService.SetPinProtectedKeyAsync(await _cryptoService.EncryptAsync(key2.Key, pinKey));
                     }
                     await AppHelpers.ResetInvalidUnlockAttemptsAsync();

src/iOS.Core/Controllers/LockPasswordViewController.cs

@@ -210,8 +210,7 @@ namespace Bit.iOS.Core.Controllers
             }
 
             var email = await _stateService.GetEmailAsync();
-            var kdf = await _stateService.GetKdfTypeAsync();
+            var kdfConfig = await _stateService.GetActiveUserCustomDataAsync(a => new KdfConfig(a?.Profile));
-            var kdfIterations = await _stateService.GetKdfIterationsAsync();
             var inputtedValue = MasterPasswordCell.TextField.Text;
 
             if (_pinLock)
@@ -222,7 +221,7 @@ namespace Bit.iOS.Core.Controllers
                     if (_isPinProtected)
                     {
                         var key = await _cryptoService.MakeKeyFromPinAsync(inputtedValue, email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000),
+                            kdfConfig,
                             await _stateService.GetPinProtectedKeyAsync());
                         var encKey = await _cryptoService.GetEncKeyAsync(key);
                         var protectedPin = await _stateService.GetProtectedPinAsync();
@@ -237,7 +236,7 @@ namespace Bit.iOS.Core.Controllers
                     else
                     {
                         var key2 = await _cryptoService.MakeKeyFromPinAsync(inputtedValue, email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000));
+                            kdfConfig);
                         failed = false;
                         await AppHelpers.ResetInvalidUnlockAttemptsAsync();
                         await SetKeyAndContinueAsync(key2);
@@ -260,7 +259,7 @@ namespace Bit.iOS.Core.Controllers
             }
             else
             {
-                var key2 = await _cryptoService.MakeKeyAsync(inputtedValue, email, kdf, kdfIterations);
+                var key2 = await _cryptoService.MakeKeyAsync(inputtedValue, email, kdfConfig);
                 
                 var storedKeyHash = await _cryptoService.GetKeyHashAsync();
                 if (storedKeyHash == null)
@@ -282,7 +281,7 @@ namespace Bit.iOS.Core.Controllers
                         var encKey = await _cryptoService.GetEncKeyAsync(key2);
                         var decPin = await _cryptoService.DecryptToUtf8Async(new EncString(protectedPin), encKey);
                         var pinKey = await _cryptoService.MakePinKeyAysnc(decPin, email,
-                            kdf.GetValueOrDefault(KdfType.PBKDF2_SHA256), kdfIterations.GetValueOrDefault(5000));
+                           kdfConfig);
                         await _stateService.SetPinProtectedKeyAsync(await _cryptoService.EncryptAsync(key2.Key, pinKey));
                     }
                     await AppHelpers.ResetInvalidUnlockAttemptsAsync();