static Task <string> PlatformGetAsync(string key)
{
var context = Platform.CurrentContext;
string encStr;
using (var prefs = context.GetSharedPreferences(Alias, FileCreationMode.Private))
encStr = prefs.GetString(Utils.Md5Hash(key), null);
var encData = Convert.FromBase64String(encStr);
var ks = new AndroidKeyStore(context, Alias, AlwaysUseAsymmetricKeyStorage);
var decryptedData = ks.Decrypt(encData);
return(Task.FromResult(decryptedData));
}
static Task PlatformSetAsync(string key, string data)
{
var context = Platform.CurrentContext;
var ks = new AndroidKeyStore(context, Alias, AlwaysUseAsymmetricKeyStorage);
var encryptedData = ks.Encrypt(data);
using (var prefs = context.GetSharedPreferences(Alias, FileCreationMode.Private))
using (var prefsEditor = prefs.Edit())
{
var encStr = Convert.ToBase64String(encryptedData);
prefsEditor.PutString(Utils.Md5Hash(key), encStr);
prefsEditor.Commit();
}
return(Task.CompletedTask);
}