Flutter椭圆曲线密钥对生成插件elliptic_curve_keypair的使用

概述

elliptic_curve_keypair 是一个用于生成椭圆曲线密钥对的 Flutter 插件。通过该插件，您可以轻松地在 Flutter 应用程序中生成公私钥对并进行签名操作。

使用步骤

1. 添加依赖

在 pubspec.yaml 文件中添加以下依赖：

dependencies:
  flutter:
    sdk: flutter
  elliptic_curve_keypair: ^版本号

运行以下命令以更新依赖项：

flutter pub get

2. 初始化插件

在您的应用程序中初始化插件，并调用相关方法来生成密钥对或进行签名。

以下是完整的示例代码：

// 导入必要的库
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:elliptic_curve_keypair/elliptic_curve_keypair.dart';
import 'package:elliptic_curve_keypair/models/ecc_result_model.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _ellipticCurveKeypairPlugin = EllipticCurveKeyppair(); // 初始化插件
  String? signed; // 签名结果
  String? public; // 公钥结果
  String? uuid; // UUID

  [@override](/user/override)
  void initState() {
    super.initState();
    SchedulerBinding.instance.addPostFrameCallback((_) async {
      // 获取公钥
      await ellipticCurveKeyPairPublicKey('alias');
      // 获取公钥 PEM 格式
      await ellipticCurveKeyPairPublicKeyPem('alias');
      // 进行签名
      await ellipticCurveKeyPairSign("datatosign", 'alias');
    });
  }

  // 生成签名的方法
  Future<void> ellipticCurveKeyPairSign(String data, String uuid) async {
    try {
      String dataToSign = data;
      String language = "English";
      String alias = uuid;

      EccResultModel signedData =
          await EllipticCurveKeypair.ellipticCurveKeyPairSigning(
        message: dataToSign,
        language: language,
        alias: alias,
      );
      if (signedData.success!) {
        print(signedData.data); // 打印签名结果
        setState(() {
          signed = signedData.data;
        });
      } else {
        print(signedData.data);
        setState(() {
          public = "FAILED, ERROR => ${signedData.data.toString()}"; // 处理错误
        });
      }
    } on PlatformException catch (e) {
      print("Unexpected error occurred $e"); // 捕获平台异常
    }
  }

  // 获取公钥的方法
  Future<void> ellipticCurveKeyPairPublicKey(String uuid) async {
    try {
      EccResultModel publicKey =
          await EllipticCurveKeypair.ellipticCurveKeyPairPublicKey(
        alias: uuid,
      );
      if (publicKey.success!) {
        print(publicKey.data); // 打印公钥
        setState(() {
          public = publicKey.data;
        });
      } else {
        setState(() {
          signed = "FAILED, ERROR => ${publicKey.data.toString()}"; // 处理错误
        });
      }
    } on PlatformException catch (e) {
      print("Unexpected error occurred $e"); // 捕获平台异常
    }
  }

  // 获取公钥 PEM 格式的方法
  Future<void> ellipticCurveKeyPairPublicKeyPem(String uuid) async {
    try {
      EccResultModel publicKey =
          await EllipticCurveKeypair.ellipticCurveKeyPairPublicKeyPem(
        alias: uuid,
      );
      if (publicKey.success!) {
        print(publicKey.data); // 打印公钥 PEM 格式
        setState(() {
          public = publicKey.data;
        });
      } else {
        setState(() {
          signed = "FAILED, ERROR => ${publicKey.data.toString()}"; // 处理错误
        });
      }
    } on PlatformException catch (e) {
      print("Unexpected error occurred $e"); // 捕获平台异常
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('elliptic_curve_keypair 示例'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
            Text('平台版本: $_platformVersion\n'), // 显示平台版本
            Text('签名结果: $signed\n'), // 显示签名结果
            Text('公钥结果: $public\n'), // 显示公钥结果
            ],
          ),
        ),
      ),
    );
  }
}