问使用Flutter API encrypt读取PEM文件

EN

import 'package:encrypt/encrypt.dart';
import 'package:encrypt/encrypt_io.dart';
import 'dart:io';
import 'package:pointycastle/asymmetric/api.dart';
import 'dart:async';
import 'package:flutter/services.dart' show rootBundle;

class Encrypt {
  Future<String> loadPrivateKey() async {
    return await rootBundle.loadString('assets/private_key.pem');
  }

  Future<String> loadPublicKey() async {
    return await rootBundle.loadString('assets/public_key.pem');
  }

  encryptString() async {
    print(loadPublicKey().toString());
    final publicKey =
        await parseKeyFromFile<RSAPublicKey>('${loadPublicKey()}');
    final privateKey =
        await parseKeyFromFile<RSAPrivateKey>('${loadPrivateKey()}');

    final plainText = 'James Bond';
    final encrypter =
        Encrypter(RSA(publicKey: publicKey, privateKey: privateKey));

    final encrypted = encrypter.encrypt(plainText);
    final decrypted = encrypter.decrypt(encrypted);

    print(decrypted);
    print(encrypted.base64);
  }
}

flutter:
  assets:
    - assets/