flutter_sodium 0.0.2

  • README.md
  • Example
  • Installing
  • Versions
  • 68


With flutter_sodium you get access to the modern, easy-to-use libsodium crypto library in your Flutter apps. One set of crypto APIs supporting both Android and iOS.

API coverage

At this point in time flutter_sodium implements the following high-level libsodium APIs:

  • crypto_auth
  • crypto_box
  • crypto_generichash
  • crypto_kdf
  • crypto_kx
  • crypto_onetimeauth
  • crypto_pwhash
  • crypto_scalarmult
  • crypto_secretbox
  • crypto_shorthash
  • crypto_sign
  • randombytes
  • sodium_version


  1. A core API that maps 1:1 to libsodium functions. Should cover the entire high-level API.
  2. Proper argument checks
  3. Fix missing API functions (such as crypto_pwhash_str_needs_rehash)
  4. A Dart-friendly, opinionated API wrapping the core API. Should work with types other than Uint8List such as strings, streams, etc.

Getting Started

In your flutter project add the dependency:

  flutter_sodium: any

Usage example

import 'package:flutter_sodium/flutter_sodium.dart';

// Password hashing (using Argon)
const opslimit = crypto_pwhash_OPSLIMIT_INTERACTIVE;
const memlimit = crypto_pwhash_MEMLIMIT_INTERACTIVE;
final password = utf8.encode('my password');
final str = await Sodium.cryptoPwhashStr(password, opslimit, memlimit);

print('Password hash str: ${ascii.decode(str)}');

// verify hash str
final valid = await Sodium.cryptoPwhashStrVerify(str, password);


Current issues

  • Some APIs are not available yet in Android
  • Getting a Swift plugin to work nicely with Flutter on iOS is a painful operation. See als https://github.com/flutter/flutter/issues/16049
  • Since Flutter does not support native binaries (see also https://github.com/flutter/flutter/issues/7053), a platform channel is established to enable native function invocation. One side effect of this approach is that the entire flutter_sodium API is asynchronous. This is great for potential long-running operations such as Argon password hashing, but does not make much sense for other short-running functions.

[0.0.2] - April 12, 2018

  • Adds support for Flutter Beta 2 and Dart 2

[0.0.1] - March 20, 2018

  • Initial release with core libsodium API support.


import 'package:flutter/material.dart';
import 'examples.dart';
import 'package:flutter_sodium/flutter_sodium.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  runExamples() async {
    final version = await Sodium.sodiumVersionString();

    print('Sodium $version');

    await exampleCryptoAuth();
    await exampleCryptoBox();
    await exampleCryptoBoxDetached();
    await exampleCryptoBoxPrecalculated();
    await exampleCryptoBoxPrecalculatedDetached();
    await exampleCryptoBoxSeal();
    await exampleCryptoGenerichash();
    await exampleCryptoGenericHashNoKey();
    await exampleCryptoGenerichashMultiPart();
    await exampleCryptoKdf();
    await exampleCryptoKx();
    await exampleCryptoOnetimeauth();
    await exampleCryptoOnetimeauthMultiPart();
    await exampleCryptoPwhash();
    await exampleCryptoPwhashStr();
    await exampleCryptoScalarmult();
    await exampleCryptoSecretbox();
    await exampleCryptoSecretboxDetached();
    await exampleCryptoShorthash();
    await exampleCryptoSign();
    await exampleCryptoSignDetached();
    await exampleCryptoSignMultiPart();
    await exampleRandombytes();

    print('Examples completed');

  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Flutter Sodium'),
          body: new Center(
              child: new RaisedButton(
                  child: new Text('Run samples'), onPressed: runExamples))),

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flutter_sodium: "^0.0.2"

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter packages get

Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

      import 'package:flutter_sodium/flutter_sodium.dart';
Version Uploaded Documentation Archive
0.0.2 Apr 12, 2018 Go to the documentation of flutter_sodium 0.0.2 Download flutter_sodium 0.0.2 archive
0.0.1 Mar 20, 2018 Go to the documentation of flutter_sodium 0.0.1 Download flutter_sodium 0.0.1 archive


We analyzed this package on Jun 19, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.0.0-dev.63.0
  • pana: 0.11.3
  • Flutter: 0.5.4


Describes how popular the package is relative to other packages. [more]
37 / 100
Code health derived from static analysis. [more]
98 / 100
Reflects how tidy and up-to-date the package is. [more]
100 / 100
Overall score:
Weighted score of the above. [more]
Learn more about scoring.


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.


  • Fix analysis and formatting issues.

    Analysis or formatting checks reported 13 hints.

    Run flutter format to format lib/flutter_sodium.dart.

    Run flutter format to format lib/src/constants.dart.

  • Package is pre-v1 release.

    While there is nothing inherently wrong with versions of 0.*.*, it usually means that the author is still experimenting with the general direction API.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev <2.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.6 1.14.10
meta 1.1.5
sky_engine 0.0.99
typed_data 1.1.5
vector_math 2.0.6 2.0.7