Flutter RSA加密解密的範例程式碼

dev_dependencies:
  flutter_test:
    sdk: flutter
  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^1.0.0
  # 全域性狀態管理
  provider: ^6.0.2
  # 資料請求
  dio: ^4.0.4
  # 本地資料持久化
  shared_preferences: ^2.0.13
  # 前端加密
  encrypt: ^5.0.1

flutter:
  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/fonts/iconfont.json
    - assets/rsa_key/rsa_public_key.pem
    - assets/rsa_key/rsa_private_key.pem
    #   - images/a_dot_burr.jpeg
    #   - images/a_dot_ham.jpeg
    - assets/images/home_logo.png

import 'dart:convert';
import 'package:encrypt/encrypt.dart';
import 'package:flutter/services.dart';
import 'package:pointycastle/asymmetric/api.dart';
class Encrypt {
  ///  加密
  static encryption(content) async {
    final parser = RSAKeyParser();
    String publicKeyString = await rootBundle.loadString('assets/rsa_key/rsa_public_key.pem');
    print('publicKeyString=$publicKeyString'); // 注意這一行的輸出
    RSAPublicKey publicKey = parser.parse(publicKeyString) as RSAPublicKey;
    final encrypter = Encrypter(RSA(publicKey: publicKey));
    return encrypter.encrypt(content).base64;
  }
  /// 解密
  static Future<String> decrypt(String decoded) async {
    final parser = RSAKeyParser();
    String privateKeyString = await rootBundle.loadString('assets/rsa_key/rsa_private_key.pem');
    final privateKey = parser.parse(privateKeyString) as RSAPrivateKey;
    final encrypter = Encrypter(RSA(privateKey: privateKey));
    return encrypter.decrypt(Encrypted.fromBase64(decoded));
  }
}

  void _userLogin() async {
    /// 資料加密
    var password = await Encrypt.encryption(_formData["password"]);
    print('_formData=$password');
  } 

import 'dart:convert';
import 'package:cyber_security/utils/http.dart';
import 'package:encrypt/encrypt.dart';
import 'package:flutter/services.dart';
import 'package:pointycastle/asymmetric/api.dart';
class Encrypt {
  /// 公鑰
  static String pubKey = '';
  /// 可以理解為是本次使用的公鑰的id
  static String key = '';
  /// 獲取公鑰
  static getKey() async {
    /// DioRequest 是我自己封裝的資料請求的工具類，如果想學習看下面的連線。
    var response = await DioRequest.getInstance().dio.get('/getKey');
    var data = jsonDecode(response.toString());
    pubKey = data['key'];
    key = data['_key'];
  }
  ///  加密
  static encryption(content) async {
    final parser = RSAKeyParser();
    /// start
    /// 這個格式千萬別動，相信我
    String publicKeyString = '''
-----BEGIN PUBLIC KEY-----
$pubKey
-----END PUBLIC KEY-----
''';
    /// end
    RSAPublicKey publicKey = parser.parse(publicKeyString) as RSAPublicKey;
    final encrypter = Encrypter(RSA(publicKey: publicKey));
    return encrypter.encrypt(content).base64;
  }
}

publicKeyString=-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDb6bKQPmUBcifd5L8hxzbluv50
26g5Jj5l1nYoq8mpxze6+iyIdJTUYbMVOGF4SEwSYL+0f0na4gC8m68n4eSnNUTB
ynG9BG8RfLKVPow3nH+0ND7WgE2iek0Z1ECqcDkim8sM3FDmVJLsSuCTlZOiorOx
bxI41zKKhL9AoO6sBQIDAQAB
-----END PUBLIC KEY-----

  void _userLogin() async {
    /// 獲取公鑰
    await Encrypt.getKey();
    /// 資料加密
    var password = await Encrypt.encryption(_formData["password"]);
    print('_formData=$password');
  }