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‎.gitattributes‎

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# Auto detect text files and perform LF normalization
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* text=auto

‎.gitignore‎

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# IDEA Project files
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.idea/
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*.iml
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# Build and Release Folders
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target/
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bin-debug/
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bin-release/
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[Oo]bj/
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[Bb]in/
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# Other files and folders
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.settings/
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# Executables
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*.swf
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*.air
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*.ipa
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*.apk
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# Project files, i.e. `.project`, `.actionScriptProperties` and `.flexProperties`
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# should NOT be excluded as they contain compiler settings and other important
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# information for Eclipse / Flash Builder.

‎LICENSE‎

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‎README.md‎

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# LatteCoin
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LatteCoin是一个使用Java开发的、基于SpringBoot框架的、基于国密算法与群签名的可溯源区块链模拟系统

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.lzw.blockchain</groupId>
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<artifactId>LatteCoin</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>LatteCoin</name>
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<description>a Traceable and anonymous blockchain system</description>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.4.2</version>
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<relativePath/>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-devtools</artifactId>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-logging</artifactId>
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</dependency>
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<!-- 视图模板 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-thymeleaf</artifactId>
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</dependency>
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<!-- 数据库连接驱动 -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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</dependency>
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<dependency>
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<groupId>cn.hutool</groupId>
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<artifactId>hutool-all</artifactId>
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<version>5.5.9</version>
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</dependency>
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<!-- 密码学套件 -->
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<dependency>
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<groupId>org.bouncycastle</groupId>
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<artifactId>bcprov-jdk15on</artifactId>
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<version>1.68</version>
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</dependency>
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<dependency>
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<groupId>it.unisa.dia.gas</groupId>
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<artifactId>jpbc-pbc</artifactId>
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<version>2.0.0</version>
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</dependency>
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<dependency>
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<groupId>it.unisa.dia.gas</groupId>
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<artifactId>jpbc-api</artifactId>
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<version>2.0.0</version>
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</dependency>
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<dependency>
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<groupId>it.unisa.dia.gas</groupId>
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<artifactId>jpbc-plaf</artifactId>
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<version>2.0.0</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/java/com/latte/blockchain/LatteCoin.java‎

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package com.latte.blockchain;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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/**
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* @author float311
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* @since 2021/01/31
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*/
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@SpringBootApplication
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public class LatteCoin {
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public static void main(String[] args) {
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SpringApplication.run(LatteCoin.class, args);
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}
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}

‎src/main/java/com/latte/blockchain/controller/LatteChainController.java‎

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package com.latte.blockchain.controller;
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import com.latte.blockchain.service.IUserService;
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import com.latte.blockchain.service.IChainService;
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import com.latte.blockchain.service.ITransactionService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.ui.Model;
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/**
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* @author float311
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* @since 2021/01/31
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*/
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@Controller
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public class LatteChainController {
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@Autowired
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private IUserService userService;
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@Autowired
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private IChainService chainService;
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@Autowired
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private ITransactionService transactionService;
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/**
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* 初始化LatteChain区块链系统，初始化预置账户并创建创世块
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*/
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@GetMapping("/init")
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public String initSystem(Model model) {
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if (chainService.initChain()) {
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return "init";
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} else {
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model.addAttribute("msg", "初始化失败，已初始化或系统错误！");
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return "error";
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}
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}
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/**
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* 查看当前所有的账户信息
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*/
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@GetMapping("/allUsersInfo")
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public String getAllUsersInfo(Model model) {
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model.addAttribute("usersInfo", userService.getAllUsersInfo());
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return "allUsers";
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}
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/**
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* 交易发起接口
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*
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* @param sender 发起方账户地址
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* @param recipient 接受方账户地址
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* @param value 交易金额
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* @return String
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*/
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@PostMapping(path = "/trade")
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public String sendFunds(@RequestParam(name = "sender") String sender,
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@RequestParam(name = "recipient") String recipient,
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@RequestParam(name = "value") float value,
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Model model) {
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model.addAttribute("transactionInfo",
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transactionService.createTransaction(sender, recipient, value));
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return "transaction";
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}
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/**
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* 对指定的交易进行追踪
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*
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* @param id 待审计交易
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* @return 交易链信息
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*/
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@PostMapping(path = "/auditTransaction")
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public String audit(@RequestParam(name = "transactionId") String id, Model model) {
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model.addAttribute("traceResult", transactionService.auditTransaction(id));
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return "auditResult";
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}
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}

‎src/main/java/com/latte/blockchain/entity/AdminGroupOpenKey.java‎

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package com.latte.blockchain.entity;
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import it.unisa.dia.gas.jpbc.Element;
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import lombok.Getter;
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/**
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* 管理员群签名打开私钥
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*
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* @author float311
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* @since 2021/04/13
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*/
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public class AdminGroupOpenKey {
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/**
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* u
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*/
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@Getter
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private final Element u;
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public AdminGroupOpenKey(Element u) {
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this.u = u;
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}
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}

‎src/main/java/com/latte/blockchain/entity/AdminGroupSecretKey.java‎

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package com.latte.blockchain.entity;
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import it.unisa.dia.gas.jpbc.Element;
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import lombok.Getter;
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/**
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* 管理员群私钥
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*
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* @author float311
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* @since 2021/04/13
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*/
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public class AdminGroupSecretKey {
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/**
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* d
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*/
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@Getter
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private Element d;
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/**
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* s
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*/
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@Getter
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private Element s;
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public AdminGroupSecretKey(Element d, Element s) {
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this.d = d;
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this.s = s;
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}
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}

‎src/main/java/com/latte/blockchain/entity/Block.java‎

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package com.latte.blockchain.entity;
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import com.latte.blockchain.enums.LatteChainConfEnum;
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import lombok.Data;
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import javax.persistence.*;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @author float
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* @since 2021/1/27
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*/
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@Data
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@Entity
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@Table(name = "blocks", schema = "lattechain")
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public class Block {
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/**
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* 区块id
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*/
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@Id
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private long id;
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/**
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* 区块信息
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*/
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@Column(name = "message", nullable = false)
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private String msg;
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/**
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* 当前区块哈希值
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*/
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private String hash;
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/**
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* 前一区块哈希值
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*/
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private String previousHash;
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/**
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* merkle根哈希值
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*/
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private String merkleRoot;
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/**
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* 交易信息 {@link Transaction}，最多包含MAX_TRANSACTION_AMOUNT个交易信息
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*/
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@Transient
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private List<Transaction> transactions;
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/**
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* 时间戳
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*/
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private long timeStamp;
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/**
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* Nonce值
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*/
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private int nonce;
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protected Block() {
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}
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public Block(String previousHash, String msg) {
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this.previousHash = previousHash;
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this.msg = msg;
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transactions = new ArrayList<>(LatteChainConfEnum.MAX_TRANSACTION_AMOUNT);
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this.timeStamp = System.currentTimeMillis();
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this.nonce = 0;
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}
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}

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