Flutter集成RSA

編者注

由於需要注重安全，則需要對關鍵信息進行加密，防止被竊取。

Dart

目錄結構

├── test
│   ├── resources
│   │   ├── rsa
│   │   │   ├── private.pem
│   │   │   └── public.pem
│   │   └── static
│   ├── rsaTest.dart

公鑰私鑰

首先計算機應當具有openssl，生成私鑰文件

openssl genrsa -out private.pem 2048

根據私鑰生成公鑰

openssl rsa -in private.pem -pubout -out public.pem

單元測試

import 'dart:convert';
import 'dart:io';

import 'package:encrypt/encrypt.dart';
import 'package:encrypt/encrypt_io.dart';
import 'package:pointycastle/asymmetric/api.dart';

void main() async {
  final publicKey = await parseKeyFromFile<RSAPublicKey>('test/resources/rsa/public.pem');
  final privKey = await parseKeyFromFile<RSAPrivateKey>('test/resources/rsa/private.pem');

  final plainText = 'hello world.';
  final encrypter = Encrypter(RSA(publicKey: publicKey, privateKey: privKey));

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

  print(decrypted); // Lorem ipsum dolor sit amet, consectetur adipiscing elit
  print(encrypted.base64); // kO9EbgbrSwiq0EYz0aBdljHSC/rci2854Qa+nugbhKjidlezNplsEqOxR+pr1RtICZGAtv0YGevJBaRaHS17eHuj7GXo1CM3PR6pjGxrorcwR5Q7/bVEePESsimMbhHWF+AkDIX4v0CwKx9lgaTBgC8/yJKiLmQkyDCj64J3JSE=
}

flutter async

new FlatButton(
            child: new Text('sra'),
            color: Colors.grey[100],
            onPressed: () async{
              RSAPublicKey publicKey = await parseKeyFromFile<RSAPublicKey>('test/public.pem');
              RSAPrivateKey privateKey= await parseKeyFromFile<RSAPrivateKey>('test/private.pem');

              final plainText = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit';
              final encrypter = Encrypter(RSA(publicKey: publicKey, privateKey: privateKey));

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

              print(decrypted);
              print(encrypted.bytes);
              print(encrypted.base16);
              print(encrypted.base64);
            }),

輸出

hello world.
l7OwX2QLfzgNdAFVYVk3YNbmVPyDjD3UC/LiG76o+XVMPLr1wccW4viE/u3KDMqYOkibi4MLqd3XxlK03GJO253henrcK0MBsO7OM8t+PD0ZVY2GSfw6LudhbuNDogOzDoMYv1tFYCknHKvIyD5nRYCLSNR902/nFdQuAhlxJqtqPLifcoSzIL1zzzlvLTnjLYdJZ2Z9oS2TDS3WRk4w5hOvbcZSVxltjILO2F21msEIqRE4VN75AmevSRSejJ4b4ZxpkIcmosOhBmeqzmjU/TRewdHBQ8z8XTDjlz4CQ+HIs8Atzk4yThIfAf058dlZK1ubBKunku5I2vpaClqvRQ==