Add example of AES api usage
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@ -1,11 +1,11 @@
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// Copyright (c) 2020
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// Author: Hugo Pointcheval
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import 'dart:developer';
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import 'dart:typed_data';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:native_crypto/native_crypto.dart';
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import 'package:native_crypto/symmetrical_crypto.dart';
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void main() => runApp(MyApp());
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@ -17,19 +17,20 @@ class MyApp extends StatefulWidget {
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class _MyAppState extends State<MyApp> {
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final textController = TextEditingController();
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String _output = 'none';
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Uint8List aeskey;
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List<Uint8List> encryptedPayload;
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String _bench;
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AES aes = AES();
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Encrypted encrypted = Encrypted();
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Uint8List decryptedPayload;
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void generateKey() async {
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aeskey = await NativeCrypto().symKeygen();
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void _generateKey() async {
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await aes.init(KeySize.bits256);
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setState(() {
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_output = 'Key generated.';
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});
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}
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void encrypt() async {
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void _encrypt() async {
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final plainText = textController.text.trim();
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var output;
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@ -37,7 +38,7 @@ class _MyAppState extends State<MyApp> {
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output = 'Entry is empty';
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} else {
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var stringToBytes = TypeHelper().stringToBytes(plainText);
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encryptedPayload = await NativeCrypto().symEncrypt(stringToBytes, aeskey);
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encrypted = await aes.encrypt(stringToBytes);
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output = 'String successfully encrypted.';
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}
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setState(() {
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@ -45,56 +46,67 @@ class _MyAppState extends State<MyApp> {
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});
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}
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void decrypt() async {
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void _decrypt() async {
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var output;
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if (encryptedPayload == null || encryptedPayload.isEmpty) {
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if (encrypted.cipherText == null || encrypted.cipherText.isEmpty) {
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output = 'Encrypt before decrypting!';
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} else {
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decryptedPayload = await NativeCrypto().symDecrypt(encryptedPayload, aeskey);
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output = 'String successfully decrypted:\n\n${TypeHelper().bytesToString(decryptedPayload)}';
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decryptedPayload = await aes.decrypt(encrypted);
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var bytesToString = TypeHelper().bytesToString(decryptedPayload);
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output = 'String successfully decrypted:\n\n$bytesToString';
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}
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setState(() {
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_output = output;
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});
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}
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void benchmark(int megabytes) async {
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var output;
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Future<String> _benchmark(int megabytes) async {
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String output;
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var bigFile = Uint8List(megabytes * 1000000);
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var before = DateTime.now();
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var encryptedBigFile = await NativeCrypto().symEncrypt(bigFile, aeskey);
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var encryptedBigFile = await aes.encrypt(bigFile);
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var after = DateTime.now();
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var benchmark = after.millisecondsSinceEpoch - before.millisecondsSinceEpoch;
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var benchmark =
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after.millisecondsSinceEpoch - before.millisecondsSinceEpoch;
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output = '$megabytes MB\n\nAES Encryption:\n$benchmark ms\n\n';
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var beforeDec = DateTime.now();
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var decryptedBigFile = await NativeCrypto().symDecrypt(encryptedBigFile, aeskey);
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var afterDec = DateTime.now();
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before = DateTime.now();
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await aes.decrypt(encryptedBigFile);
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after = DateTime.now();
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print(bigFile.length);
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print(decryptedBigFile.length);
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benchmark = after.millisecondsSinceEpoch - before.millisecondsSinceEpoch;
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print(listEquals(bigFile, decryptedBigFile));
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output += 'AES Decryption:\n$benchmark ms\n\n\n';
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var benchmarkDec = afterDec.millisecondsSinceEpoch - beforeDec.millisecondsSinceEpoch;
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return output;
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}
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output += 'AES Decryption:\n$benchmarkDec ms';
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setState(() {
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void _testPerf({int megabytes}) async {
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var output = '';
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if (megabytes != null) {
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output = await _benchmark(megabytes);
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setState(() {
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_output = output;
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});
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} else {
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setState(() {
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_bench = 'Open the logcat!';
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});
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for (int i=1;i<100;i+=10) {
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var benchmark = await _benchmark(i);
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log(benchmark);
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}
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}
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}
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@override
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void initState() {
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// Generate AES key on init.
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generateKey();
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// Generate AES instance on init.
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_generateKey();
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super.initState();
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}
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@ -113,63 +125,87 @@ class _MyAppState extends State<MyApp> {
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centerTitle: true,
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title: const Text('Native Crypto'),
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),
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body: Padding(
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padding: const EdgeInsets.fromLTRB(20, 10, 10, 20),
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child: Center(
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child: Column(
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children: <Widget>[
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TextField(
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controller: textController,
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decoration: InputDecoration(
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hintText: 'Text to encrypt.',
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body: SingleChildScrollView(
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child: Padding(
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padding: const EdgeInsets.fromLTRB(20, 10, 10, 20),
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child: Center(
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child: Column(
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children: <Widget>[
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TextField(
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controller: textController,
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decoration: InputDecoration(
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hintText: 'Text to encrypt.',
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),
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),
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),
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SizedBox(height: 20),
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FlatButton(
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onPressed: encrypt,
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color: Colors.blue,
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child: Text(
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'Encrypt String',
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style: TextStyle(color: Colors.white),
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)),
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(encryptedPayload != null && encryptedPayload.isNotEmpty)
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? Text(encryptedPayload.first.toList().toString())
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: Container(),
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FlatButton(
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onPressed: decrypt,
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color: Colors.blue,
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child: Text(
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'Decrypt String',
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style: TextStyle(color: Colors.white),
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)),
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SizedBox(height: 20),
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// Output
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Text(_output,
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textAlign: TextAlign.center,
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style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),),
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SizedBox(height: 20),
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FlatButton(
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onPressed: () {benchmark(1);},
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color: Colors.blue,
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child: Text(
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'Benchmark 1 MB',
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style: TextStyle(color: Colors.white),
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)),
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FlatButton(
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onPressed: () {benchmark(10);},
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color: Colors.blue,
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child: Text(
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'Benchmark 10 MB',
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style: TextStyle(color: Colors.white),
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)),
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FlatButton(
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onPressed: () {benchmark(50);},
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color: Colors.blue,
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child: Text(
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'Benchmark 50 MB',
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style: TextStyle(color: Colors.white),
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)),
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],
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SizedBox(height: 20),
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FlatButton(
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onPressed: _encrypt,
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color: Colors.blue,
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child: Text(
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'Encrypt String',
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style: TextStyle(color: Colors.white),
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)),
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(encrypted.cipherText != null && encrypted.cipherText.isNotEmpty)
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? Text(encrypted.cipherText.toString())
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: Container(),
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FlatButton(
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onPressed: _decrypt,
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color: Colors.blue,
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child: Text(
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'Decrypt String',
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style: TextStyle(color: Colors.white),
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)),
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SizedBox(height: 20),
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// Output
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Text(
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_output,
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textAlign: TextAlign.center,
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style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
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),
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SizedBox(height: 20),
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FlatButton(
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onPressed: () {
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_testPerf(megabytes: 1);
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},
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color: Colors.blue,
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child: Text(
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'Benchmark 1 MB',
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style: TextStyle(color: Colors.white),
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)),
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FlatButton(
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onPressed: () {
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_testPerf(megabytes: 10);
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},
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color: Colors.blue,
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child: Text(
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'Benchmark 10 MB',
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style: TextStyle(color: Colors.white),
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)),
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FlatButton(
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onPressed: () {
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_testPerf(megabytes: 50);
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},
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color: Colors.blue,
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child: Text(
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'Benchmark 50 MB',
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style: TextStyle(color: Colors.white),
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)),
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SizedBox(height: 20),
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FlatButton(
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onPressed: () {
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_testPerf();
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},
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color: Colors.blue,
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child: Text(
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'Full benchmark',
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style: TextStyle(color: Colors.white),
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)),
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(_bench != null && _bench.isNotEmpty)
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? Text(_bench)
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: Container(),
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],
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),
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),
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),
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),
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@ -177,3 +213,19 @@ class _MyAppState extends State<MyApp> {
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);
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}
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}
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/// Contains some useful functions.
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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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