79 lines
2.2 KiB
Dart
79 lines
2.2 KiB
Dart
// Copyright (c) 2020
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// Author: Hugo Pointcheval
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import 'dart:async';
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import 'dart:developer';
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import 'dart:typed_data';
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import 'package:flutter/services.dart';
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class NativeCrypto {
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static const String _tag = 'fr.pointcheval.native_crypto';
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static const MethodChannel _channel =
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const MethodChannel('native.crypto.helper');
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/// Generates AES key.
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///
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/// Size of **256 bits** by design.
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/// And returns `Uint8List`.
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Future<Uint8List> symKeygen() async {
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final Uint8List aesKey = await _channel.invokeMethod('symKeygen');
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log('AES Key Length: ${aesKey.length}', name: _tag);
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print('AES Key: $aesKey');
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return aesKey;
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}
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/// Encrypts passed data with a given AES key.
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///
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/// Generates a random **IV**. Returns a list
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/// of `Uint8List` with encrypted cipher as first
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/// and IV as second member.
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Future<List<Uint8List>> symEncrypt(
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Uint8List payloadbytes, Uint8List aesKey) async {
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final List<Uint8List> encryptedPayload =
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await _channel.invokeListMethod('symEncrypt', <String, dynamic>{
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'payload': payloadbytes,
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'aesKey': aesKey,
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});
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log('Payload Length: ${payloadbytes.length}', name: _tag);
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log('Cipher Length: ${encryptedPayload.first.length}', name: _tag);
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print('Cipher: ${encryptedPayload.first}');
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log('IV Length: ${encryptedPayload.last.length}', name: _tag);
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print('IV: ${encryptedPayload.last}');
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return encryptedPayload;
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}
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/// Decrypts a passed payload with a given AES key.
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///
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/// The payload must be a list of `Uint8List`
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/// with encrypted cipher as first and IV as second member.
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Future<Uint8List> symDecrypt(
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List<Uint8List> payloadbytes, Uint8List aesKey) async {
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final Uint8List decryptedPayload =
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await _channel.invokeMethod('symDecrypt', <String, dynamic>{
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'payload': payloadbytes,
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'aesKey': aesKey,
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});
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return decryptedPayload;
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}
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}
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class TypeHelper {
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/// Returns bytes `Uint8List` from a `String`.
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Uint8List stringToBytes(String source) {
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var list = source.codeUnits;
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var bytes = Uint8List.fromList(list);
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return bytes;
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}
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/// Returns a `String` from bytes `Uint8List`.
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String bytesToString(Uint8List bytes) {
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var string = String.fromCharCodes(bytes);
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return string;
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}
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}
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