An implementation for flutter secure file storage

Last update: Oct 29, 2022

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Overview

Flutter secure file storage

An implementation for flutter secure file storage. For example keychain has a soft limit of 4kb. Using the file system instead we can store much larger content.

AES/GCM/NoPadding encryption is used to encrypt the data. The keys are generated using Random.secureand stored using the flutter_secure_storage package, the values are encrypted by the pointycastle package or native for Android

Usage

It's implemented to use the same structure as FlutterSecureStorage and therefore you can switch easily between them. But we also support Uint8List as input/output

import 'package:flutter_secure_file_storage/flutter_secure_file_storage.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';

// Create storage
final storage = FlutterSecureFileStorage(FlutterSecureStorage());

// Read value
final value = await storage.read<String>(key: key);

// Read all values
Map<String, String> allValues = await storage.readAll();

// Delete value
await storage.delete(key: key);

// Delete all
await storage.deleteAll();

// Write value
await storage.write(key: key, value: value);

Configure Android version

In [project]/android/app/build.gradle set minSdkVersion to >= 18.

android {
    ...

    defaultConfig {
        ...
        minSdkVersion 18
        ...
    }

}

Comments

Mismatch in encoding and decoding of String

The code found in: https://github.com/icapps/flutter_secure_file_storage/blob/d0317a33cf51faeaf00fd465df934341979b52f1/lib/src/encryption_util.dart#L19-L27

Is problematic since string.codeUnits (used when encrypting) returns UTF-16 code units:

An unmodifiable list of the UTF-16 code units of this string.

https://api.dart.dev/stable/2.15.1/dart-core/String/codeUnits.html

While the decryption logic uses utf8.decode which is used to decode UTF-8.

You should use utf8.encode to encode your String if your intension is to use UTF-8.

opened by julemand101 2
Delete throws an error when file not found
If we don't have the file or a specific value, we should ignore the error and return a success, since the file does not exists and that's the point of deleting it 😁

I/flutter (25796): 11:20:23.674 FileSystemException: Cannot delete file, path = '/data/user/0/package_name/app_flutter/cmatc3RlXaNvb4ZpZ19vdmVycmlkZQ==.enc' (OS Error: No such file or directory, errno = 2)
bug P0
opened by ikbendewilliam 1
Code improvements
Use a platform channel to check if ios is supported. Fixes #3

Rename platform channel from be.icapps to com.icapps. Fixes #11

Use compute when on non-supported platform. Fixes #4

Remove unwanted files from git. Fixes #19
opened by NicolaVerbeeck 0
_keys should be saved somewhere.

Right now the _keys field is always empty until you save something.

We should save all the keys. So we always know what is saved and what is not saved.
bug P0

opened by vanlooverenkoen 0
Specify output folder

The output directory is just /Documents we should add an option to specify a specific output folder inside the Documents folder.

example: /Documents/cache/customcache/2020
enhancement P1

opened by vanlooverenkoen 0
Use method channel to check for >= iOS 13

Now we use the device_info_plus package, but we only need the one check. So it would be better to do the check native and return a bool.

AS IS: It just checks != 12 so it would also match below 12!
P0 improve code

opened by ikbendewilliam 0

Releases(0.0.5)

0.0.5(Jan 10, 2022)

Source code(tar.gz)
Source code(zip)

An implementation for flutter secure file storage

Related tags

Overview

Flutter secure file storage

Usage

Configure Android version

Comments

Mismatch in encoding and decoding of String

Delete throws an error when file not found

Code improvements

_keys should be saved somewhere.

Specify output folder

Use method channel to check for >= iOS 13

Releases(0.0.5)

0.0.5(Jan 10, 2022)

Owner

icapps

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