Dart encryption

lib/src/common/crypto.dart

@@ -1,14 +1,56 @@
 import 'dart:async';
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:basic_utils/basic_utils.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter_paystack/src/common/utils.dart';
+
+// Former Import from Method Channels
+// import 'package:flutter_paystack/src/common/utils.dart';
+
+import 'package:pointycastle/export.dart';
+
+class Cryptom {
+  /// String Public Key
+  String publickey =
+      "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBANIsL+RHqfkBiKGn/D1y1QnNrMkKzxWP" +
+          "2wkeSokw2OJrCI+d6YGJPrHHx+nmb/Qn885/R01Gw6d7M824qofmCvkCAwEAAQ==";
+
+  String encrypt(String plaintext, String publicKey) {
+    /// After a lot of research on how to convert the public key [String] to [RSA PUBLIC KEY]
+    /// We would have to use PEM Cert Type and the convert it from a PEM to an RSA PUBLIC KEY through basic_utils
+    ///
+    var pem =
+        '-----BEGIN RSA PUBLIC KEY-----\n$publickey\n-----END RSA PUBLIC KEY-----';
+    var public = CryptoUtils.rsaPublicKeyFromPem(pem);
+
+    /// Initalizing Cipher
+    var cipher = PKCS1Encoding(RSAEngine());
+    cipher.init(true, PublicKeyParameter<RSAPublicKey>(public));
+
+    /// Converting into a [Unit8List] from List<int>
+    /// Then Encoding into Base64
+    Uint8List output =
+        cipher.process(Uint8List.fromList(utf8.encode(plaintext)));
+    var base64EncodedText = base64Encode(output);
+    return base64EncodedText;
+  }
+
+  String text(String text) {
+    return encrypt(text, publickey);
+  }
+}
 
 class Crypto {
   static Future<String> encrypt(String data) async {
     var completer = Completer<String>();
 
     try {
-      String? result = await Utils.methodChannel
-          .invokeMethod('getEncryptedData', {"stringData": data});
+      /// This is commented to prevent conflicts
+      // String? result = await Utils.methodChannel
+      //     .invokeMethod('getEncryptedData', {"stringData": data});
+      String? result = Cryptom().text(data);
+      print(result);
       completer.complete(result);
     } on PlatformException catch (e) {
       completer.completeError(e);

pubspec.yaml

@@ -11,6 +11,9 @@ dependencies:
   meta: ^1.3.0
   async: ^2.5.0
 
+  # Required for Dart Encryption
+  basic_utils:
+  pointycastle:
 dev_dependencies:
   flutter_test:
     sdk: flutter