packages/native_crypto/example/android/build.gradle

@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = "1.6.21"
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath 'com.android.tools.build:gradle:7.2.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

packages/native_crypto/example/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-all.zip

packages/native_crypto/example/lib/pages/benchmark_page.dart

@@ -3,7 +3,7 @@
 // -----
 // File: benchmark_page.dart
 // Created Date: 28/12/2021 15:12:39
-// Last Modified: 28/12/2021 17:01:41
+// Last Modified: 24/05/2022 17:23:33
 // -----
 // Copyright (c) 2021
 
@@ -12,6 +12,7 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:native_crypto/native_crypto.dart';
+import 'package:native_crypto_example/pointycastle/aes_gcm.dart';
 import 'package:native_crypto_example/widgets/button.dart';
 
 import '../session.dart';
@@ -23,37 +24,10 @@ class BenchmarkPage extends ConsumerWidget {
   final Output keyContent = Output();
   final Output benchmarkStatus = Output(large: true);
 
-  Future<void> _test(WidgetRef ref, Cipher cipher) async {
+  Future<void> _benchmark(WidgetRef ref, Cipher cipher,
-    Session state = ref.read(sessionProvider.state).state;
+      {bool usePc = false}) async {
-
-    if (state.secretKey.bytes.isEmpty) {
-      benchmarkStatus
-          .print('No SecretKey!\nGo in Key tab and generate or derive one.');
-      return;
-    }
-
-    int size = 64;
-    benchmarkStatus.print("Benchmark Test\n");
-
-    // Encryption
-    var before = DateTime.now();
-    var encryptedBigFile = await cipher.encrypt(Uint8List(size * 1000000));
-    var after = DateTime.now();
-    var benchmark =
-        after.millisecondsSinceEpoch - before.millisecondsSinceEpoch;
-    benchmarkStatus.append('[$size MB] Encryption took $benchmark ms\n');
-
-    // Decryption
-    var befored = DateTime.now();
-    await cipher.decrypt(encryptedBigFile);
-    var afterd = DateTime.now();
-    var benchmarkd =
-        afterd.millisecondsSinceEpoch - befored.millisecondsSinceEpoch;
-    benchmarkStatus.append('[$size MB] Decryption took $benchmarkd ms\n');
-  }
-
-  Future<void> _benchmark(WidgetRef ref, Cipher cipher) async {
     Session state = ref.read(sessionProvider.state).state;
+    AesGcm pc = AesGcm();
 
     if (state.secretKey.bytes.isEmpty) {
       benchmarkStatus
@@ -75,7 +49,13 @@ class BenchmarkPage extends ConsumerWidget {
 
       // Encryption
       var before = DateTime.now();
-      var encryptedBigFile = await cipher.encrypt(b.buffer.asUint8List());
+      Object encryptedBigFile;
+      if (usePc) {
+        encryptedBigFile =
+            pc.encrypt(b.buffer.asUint8List(), state.secretKey.bytes);
+      } else {
+        encryptedBigFile = await cipher.encrypt(b.buffer.asUint8List());
+      }
       var after = DateTime.now();
 
       var benchmark =
@@ -87,7 +67,11 @@ class BenchmarkPage extends ConsumerWidget {
 
       // Decryption
       before = DateTime.now();
-      await cipher.decrypt(encryptedBigFile);
+      if (usePc) {
+        pc.decrypt(encryptedBigFile as Uint8List, state.secretKey.bytes);
+      } else {
+        await cipher.decrypt(encryptedBigFile as CipherText);
+      }
       after = DateTime.now();
 
       benchmark = after.millisecondsSinceEpoch - before.millisecondsSinceEpoch;
@@ -150,11 +134,11 @@ class BenchmarkPage extends ConsumerWidget {
               children: [
                 Button(
                   () => _benchmark(ref, cipher),
-                  "Launch benchmark",
+                  "NativeCrypto",
                 ),
                 Button(
-                  () => _test(ref, cipher),
+                  () => _benchmark(ref, cipher, usePc: true),
-                  "Test benchmark",
+                  "PointyCastle",
                 ),
                 Button(
                   _clear,

packages/native_crypto/example/lib/pointycastle/aes_gcm.dart

@@ -0,0 +1,78 @@
+// Author: Hugo Pointcheval
+// Email: git@pcl.ovh
+// -----
+// File: aes_gcm.dart
+// Created Date: 24/05/2022 16:34:54
+// Last Modified: 24/05/2022 17:15:22
+// -----
+// Copyright (c) 2022
+
+import 'dart:typed_data';
+
+import 'package:pointycastle/export.dart';
+import 'package:pointycastle/src/platform_check/platform_check.dart';
+
+class AesGcm {
+  FortunaRandom? _secureRandom;
+
+  Uint8List encrypt(Uint8List data, Uint8List key) {
+    final iv = generateRandomBytes(12);
+
+    final gcm = GCMBlockCipher(AESEngine())
+      ..init(
+        true,
+        AEADParameters(
+          KeyParameter(key),
+          16 * 8,
+          iv!,
+          Uint8List(0),
+        ),
+      ); // true=encrypt
+
+    final cipherText = gcm.process(data);
+
+    return Uint8List.fromList(
+      iv + cipherText,
+    );
+  }
+
+  Uint8List decrypt(Uint8List cipherText, Uint8List key) {
+    final iv = Uint8List.fromList(cipherText.sublist(0, 12));
+    final cipherTextWithoutIv = Uint8List.fromList(
+      cipherText.sublist(12),
+    );
+
+    final gcm = GCMBlockCipher(AESEngine())
+      ..init(
+        false,
+        AEADParameters(
+          KeyParameter(key),
+          16 * 8,
+          iv,
+          Uint8List(0),
+        ),
+      ); // false=decrypt
+
+    // Decrypt the cipherText block-by-block
+
+    final paddedPlainText = gcm.process(cipherTextWithoutIv);
+
+    return paddedPlainText;
+  }
+
+  /// Generate random bytes to use as the Initialization Vector (IV).
+  Uint8List? generateRandomBytes(int numBytes) {
+    if (_secureRandom == null) {
+      // First invocation: create _secureRandom and seed it
+
+      _secureRandom = FortunaRandom();
+      _secureRandom!.seed(
+          KeyParameter(Platform.instance.platformEntropySource().getBytes(32)));
+    }
+
+    // Use it to generate the random bytes
+
+    final iv = _secureRandom!.nextBytes(numBytes);
+    return iv;
+  }
+}

packages/native_crypto/example/pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
   flutter_riverpod: ^1.0.3
+  pointycastle: ^3.6.0
 
 dev_dependencies:
   flutter_test: