Flutter ECC操作插件eosdart_ecc的使用

椭圆曲线密码学 (ECC) 在 Dart 中的应用

eosdart_ecc 是一个用于基于 EOS 的区块链的椭圆曲线密码学库，使用 Dart 语言编写。它提供了生成私钥、公钥、签名和验证签名等功能。

使用方法

下面是一个简单的使用示例：

import 'package:eosdart_ecc/eosdart_ecc.dart';

void main() {
  // 构造 EOS 私钥
  EOSPrivateKey privateKey = EOSPrivateKey.fromString(
      '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3');

  // 获取对应的 EOS 公钥
  EOSPublicKey publicKey = privateKey.toEOSPublicKey();
  // 打印 EOS 公钥
  print('Public Key: ${publicKey.toString()}');

  // 签名数据
  String data = 'data';
  EOSSignature signature = privateKey.signString(data);
  // 打印签名
  print('Signature: ${signature.toString()}');

  // 验证签名
  bool isVerified = signature.verify(data, publicKey);
  print('Verification Result: $isVerified');

  // 从签名中恢复公钥
  var recoveredPublicKey = signature.recover(data);
  print('Recovered Public Key: ${recoveredPublicKey.toString()}');
}

功能与问题反馈

如果您有任何功能请求或发现任何问题，请在 GitHub Issues 上提交。

参考资料

• eosjs-ecc: https://github.com/EOSIO/eosjs-ecc

完整示例 Demo

为了更好地理解如何使用 eosdart_ecc 插件，以下是一个完整的 Flutter 示例应用代码：

pubspec.yaml

确保在 pubspec.yaml 文件中添加依赖项：

dependencies:
  flutter:
    sdk: flutter
  eosdart_ecc: ^0.1.0 # 请根据实际情况调整版本号

main.dart

创建一个简单的 Flutter 应用来演示 eosdart_ecc 的使用：

import 'package:flutter/material.dart';
import 'package:eosdart_ecc/eosdart_ecc.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter ECC Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ECCDemo(),
    );
  }
}

class ECCDemo extends StatefulWidget {
  @override
  _ECCDemoState createState() => _ECCDemoState();
}

class _ECCDemoState extends State<ECCDemo> {
  String privateKeyString = '5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3';
  String publicKey = '';
  String signature = '';
  String recoveredPublicKey = '';
  bool isVerified = false;

  void generateKeysAndSign() async {
    EOSPrivateKey privateKey = EOSPrivateKey.fromString(privateKeyString);
    EOSPublicKey publicKeyObj = privateKey.toEOSPublicKey();
    setState(() {
      publicKey = publicKeyObj.toString();
    });

    String data = 'Hello, Flutter!';
    EOSSignature signatureObj = privateKey.signString(data);
    setState(() {
      signature = signatureObj.toString();
    });

    bool verificationResult = signatureObj.verify(data, publicKeyObj);
    setState(() {
      isVerified = verificationResult;
    });

    var recoveredPublicKeyObj = signatureObj.recover(data);
    setState(() {
      recoveredPublicKey = recoveredPublicKeyObj.toString();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter ECC Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            ElevatedButton(
              onPressed: generateKeysAndSign,
              child: Text('Generate Keys and Sign Data'),
            ),
            SizedBox(height: 20),
            Text('Private Key: $privateKeyString'),
            Text('Public Key: $publicKey'),
            Text('Signature: $signature'),
            Text('Recovered Public Key: $recoveredPublicKey'),
            Text('Verification Result: $isVerified'),
          ],
        ),
      ),
    );
  }
}

此示例展示了如何在一个 Flutter 应用中使用 eosdart_ecc 插件进行密钥生成、数据签名和签名验证。您可以运行此应用并点击按钮来查看结果。