CODEWITHSUNDEEP
securitycachingxamarinakavache
cfl
cfl

Reputation: 1049

Akavache security override not working

As you know akavache has issues with its secure storage on iOS and Android. I am trying to override the secure storage used by Akavache.

I've been following the example given by Kent to solve this problem: http://kent-boogaart.com/blog/password-protected-encryption-provider-for-akavache

Note: I cannot use System.Security.Cryptography in my code, because we are using PCL's. Therefore I am using PCLCrypto.

I use a setup class to initialize DI: 

IPasswordProtectedEncryptionProvider providerInstance = new PasswordProtectedEncryptionProvider();
providerInstance.SetPassword("test");
Splat.Locator.CurrentMutable.Register(() => providerInstance, typeof(Akavache.IEncryptionProvider));
Container.RegisterSingleton<ICache>(new CacheManager());

I use PasswordProtectedEncryptionProvider as my custom override of IEncryptionProvider. However the methods overridden in the class, DecryptBlock EncryptBlock, do not get called!

Don't understand why its not being called.

Doesn't () => providerInstance override it?

Upvotes: 1

Views: 154

Answers (1)

rdavisau
rdavisau

Reputation: 895

Depending on the timing of your registration, and the way you get your secure cache, it may be getting LIFO'd by Akavache's default registrations.

To avoid the ambiguity (and for cleaner DI), I typically set up my encrypted caches as below:

var fsprovider = Locator.Current.GetService<IFilesystemProvider>();

var root = fsprovider.GetDefaultSecretCacheDirectory();
var dbName = "mysecrets.db";        
var path = Path.Combine(root, dbName);

var encryptionProvider = /* create + init or resolve your enc provider here */

var encryptedCache = new SQLiteEncryptedBlobCache(path, encryptionProvider);

To solve your specific issue, initialize the cache manager ahead of the DI: 

CacheManager _cache = new CacheManager();

IPasswordProtectedEncryptionProvider providerInstance = new PasswordProtectedEncryptionProvider();
providerInstance.SetPassword("test");
Splat.Locator.CurrentMutable.Register(() => providerInstance, typeof(Akavache.IEncryptionProvider));

Container.RegisterSingleton<ICache>(_cache);

Upvotes: 2

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