这是我最近写的一个近乎于完整的模拟比特币的代码，实际上还不够完整，不过已经能实现打包交易进入区块，然后挖矿了。这个程序是只有一个节点在挖矿，所以暂时也不涉及分布式系统的东西，还算比较简单容易理解。这个程序就是整个网络中一个节点的视角。分享出来希望对大家有所帮助。
部署过程就是把代码统统贴过去，要注意的就是代码中有两个文件的路径，要手动改一下，代码中有两个文件的路径，要手动改一下，代码中有两个文件的路径，要手动改一下，重要的事情说三遍，然后就可以运行，观察比特币挖矿过程啦！有问题欢迎提问。
Blockchain.h这个没什么说的，创建一个区块链类
#pragma once#include"Block.h"#include<vector>//向量库class Blockchain{public:Blockchain();//默认构造函数void AddBlock(Block bNew);//增加区块函数uint32_t _nDifficulty;//难度值vector<Block> _vChain;//保存区块的变量Block _GetLastBlock() const;//获取最新的区块，由const关键字，表示输出的内容不可更改};
Blockchain.cpp修改难度值在这里修改Blockchain的构造函数中的nDifficulty就可以了。
#include"Blockchain.h"Blockchain::Blockchain(){_vChain.emplace_back(Block(0, "Genesis Block"));_nDifficulty = 4;//难度值设置3基本上秒出结果，4可以看出差距，5大约要等2分钟左右。}void Blockchain::AddBlock(Block bNew){bNew.sPrevHash = _GetLastBlock().GetHash();bNew.MineBlock(_nDifficulty);_vChain.push_back(bNew);bNew.WriteBlcokToTXT();//调用区块类中的写文件方法} Block Blockchain::_GetLastBlock() const{return _vChain.back();}
Block.h这里是声明区块类
#pragma once#include<cstdint>//包含了uint32_t等无符号整型#include<iostream>//标准输入输出库#include <fstream>using namespace std;static time_t first_time = 0;//这个地方是为了记录每个区块产生距离第一个区块的时间而设置的全局变量//创建区块类class Block{public:string sPrevHash;//前一个区块的哈希值Block(uint32_t nIndexIn, const string& sDataIn);//构造函数string GetHash();//返回哈希值void MineBlock(uint32_t nDifficulty);//挖矿，其参数nDifficulty表示指定的难度值void NoMineBlock();//不挖矿直接添加区块uint32_t _nIndex;//区块索引值，第几个区块，从0开始计算int64_t _nNonce;//区块随机数string _sData;//区块描述字符string _sHash;//区块Hash值time_t _tTime;//区块生成时间string _CalculateHash() const;//计算Hash值，const保证输出的函数值不能被改变。void WriteBlcokToTXT();//将区块数据写入到TXT文件中};
Block.cpp
#include"Block.h"#include"sha256.h"#include"time.h"#include<sstream>Block::Block(uint32_t nIndexIn, const string& sDataIn) :_nIndex(nIndexIn), _sData(sDataIn)//构造函数Block的两个参数为nIndexIn和sDataIn，分别赋值到Block中的_nIndex和_sData（构造函数初始化用法）{_nNonce = -1;//Nounce设置为-1_tTime = time(nullptr);//设置时间if (nIndexIn == 0)//此处整个时间记录下来是为了记录当前区块生成所需要的时间，而不是当前时间first_time = _tTime;}string Block::GetHash()//返回哈希值函数的实现{return _sHash;}void Block::MineBlock(uint32_t nDifficulty)//挖矿函数，参数为难度值。{//char cstr[nDifficulty + 1];char cstr[10 + 1];//这个数组实际上设置多大都可以，但是要大于nDifficulty的值for (uint32_t i = 0; i < nDifficulty; ++i)//填充数组，使数组的前nDifficulty位都为0，作为难度。{cstr[i] = '0';}cstr[nDifficulty] = '\0';string str(cstr);//创建一个string类的对象，初始化为cstr（将字符串数组转换为string类对象） do{_nNonce++;_sHash = _CalculateHash(); } while (_sHash.substr(0, nDifficulty) != str);//substr表示从下标0开始--->nDifficulty的内容//要寻找一个Nounce使得总体哈希值的前n位的0（即0的个数）和难度值的个数相同，则挖矿成功。cout << "Block mined:" << _sHash << endl;} inline string Block::_CalculateHash() const{stringstream ss;//该对象可以通过<<接收多个数据，保存到ss对象中，并通过str方法，将内容赋给一个string对象ss << _nIndex << _tTime << _sData << _nNonce << sPrevHash;//return sha256(ss.str());return sha256(sha256(ss.str()));} void Block::WriteBlcokToTXT()//将生成的区块数据输出到一个txt文档中来保存路径自己改{ofstream outfile("out.txt", ios::app);//此处修改保存区块数据的路径outfile <<"Index:"<<_nIndex<<endl;outfile << "Nonce:" << _nNonce << endl;outfile << "_sData:" << _sData << endl;outfile << "_sHash:" << _sHash << endl;outfile << "sPrevHash:" << sPrevHash << endl;outfile << "_tTime:" << _tTime - first_time << endl;outfile << endl;outfile.close();}
sha256.h 这是一个哈希算法，没什么说的，网上抄的，这个东西我到现在也没看懂，太深奥了。但是只要知道功能就行了。
#pragma once #ifndef SHA256_H#define SHA256_H#include <string> class SHA256{protected:typedef unsigned char uint8;typedef unsigned int uint32;typedef unsigned long long uint64; const static uint32 sha256_k[];static const unsigned int SHA224_256_BLOCK_SIZE = (512 / 8);public:void init();void update(const unsigned char* message, unsigned int len);void final(unsigned char* digest);static const unsigned int DIGEST_SIZE = (256 / 8); protected:void transform(const unsigned char* message, unsigned int block_nb);unsigned int m_tot_len;unsigned int m_len;unsigned char m_block[2 * SHA224_256_BLOCK_SIZE];uint32 m_h[8];}; std::string sha256(std::string input); #define SHA2_SHFR(x, n) (x >> n)#define SHA2_ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))#define SHA2_ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))#define SHA2_CH(x, y, z) ((x & y) ^ (~x & z))#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))#define SHA256_F1(x) (SHA2_ROTR(x, 2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))#define SHA256_F2(x) (SHA2_ROTR(x, 6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))#define SHA256_F3(x) (SHA2_ROTR(x, 7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x, 3))#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))#define SHA2_UNPACK32(x, str) \{ \ *((str) + 3) = (uint8) ((x) ); \ *((str) + 2) = (uint8) ((x) >> 8); \ *((str) + 1) = (uint8) ((x) >> 16); \ *((str) + 0) = (uint8) ((x) >> 24); \}#define SHA2_PACK32(str, x) \{ \ *(x) = ((uint32) *((str) + 3) ) \ | ((uint32) *((str) + 2) << 8) \ | ((uint32) *((str) + 1) << 16) \ | ((uint32) *((str) + 0) << 24); \}#endif
sha256.cpp
#define _CRT_SECURE_NO_WARNINGS#include <cstring>#include <fstream>#include "sha256.h" const unsigned int SHA256::sha256_k[64] = //UL = uint32{ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 }; void SHA256::transform(const unsigned char* message, unsigned int block_nb){uint32 w[64];uint32 wv[8];uint32 t1, t2;const unsigned char* sub_block;int i;int j;for (i = 0; i < (int)block_nb; i++) {sub_block = message + (i << 6);for (j = 0; j < 16; j++) {SHA2_PACK32(&sub_block[j << 2], &w[j]);}for (j = 16; j < 64; j++) {w[j] = SHA256_F4(w[j - 2]) + w[j - 7] + SHA256_F3(w[j - 15]) + w[j - 16];}for (j = 0; j < 8; j++) {wv[j] = m_h[j];}for (j = 0; j < 64; j++) {t1 = wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])+ sha256_k[j] + w[j];t2 = SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);wv[7] = wv[6];wv[6] = wv[5];wv[5] = wv[4];wv[4] = wv[3] + t1;wv[3] = wv[2];wv[2] = wv[1];wv[1] = wv[0];wv[0] = t1 + t2;}for (j = 0; j < 8; j++) {m_h[j] += wv[j];}}} void SHA256::init(){m_h[0] = 0x6a09e667;m_h[1] = 0xbb67ae85;m_h[2] = 0x3c6ef372;m_h[3] = 0xa54ff53a;m_h[4] = 0x510e527f;m_h[5] = 0x9b05688c;m_h[6] = 0x1f83d9ab;m_h[7] = 0x5be0cd19;m_len = 0;m_tot_len = 0;} void SHA256::update(const unsigned char* message, unsigned int len){unsigned int block_nb;unsigned int new_len, rem_len, tmp_len;const unsigned char* shifted_message;tmp_len = SHA224_256_BLOCK_SIZE - m_len;rem_len = len < tmp_len ? len : tmp_len;memcpy(&m_block[m_len], message, rem_len);if (m_len + len < SHA224_256_BLOCK_SIZE) {m_len += len;return;}new_len = len - rem_len;block_nb = new_len / SHA224_256_BLOCK_SIZE;shifted_message = message + rem_len;transform(m_block, 1);transform(shifted_message, block_nb);rem_len = new_len % SHA224_256_BLOCK_SIZE;memcpy(m_block, &shifted_message[block_nb << 6], rem_len);m_len = rem_len;m_tot_len += (block_nb + 1) << 6;} void SHA256::final(unsigned char* digest){unsigned int block_nb;unsigned int pm_len;unsigned int len_b;int i;block_nb = (1 + ((SHA224_256_BLOCK_SIZE - 9)< (m_len % SHA224_256_BLOCK_SIZE)));len_b = (m_tot_len + m_len) << 3;pm_len = block_nb << 6;memset(m_block + m_len, 0, pm_len - m_len);m_block[m_len] = 0x80;SHA2_UNPACK32(len_b, m_block + pm_len - 4);transform(m_block, block_nb);for (i = 0; i < 8; i++) {SHA2_UNPACK32(m_h[i], &digest[i << 2]);}} std::string sha256(std::string input){unsigned char digest[SHA256::DIGEST_SIZE];memset(digest, 0, SHA256::DIGEST_SIZE); SHA256 ctx = SHA256();ctx.init();ctx.update((unsigned char*)input.c_str(), input.length());ctx.final(digest); char buf[2 * SHA256::DIGEST_SIZE + 1];buf[2 * SHA256::DIGEST_SIZE] = 0;for (int i = 0; i < SHA256::DIGEST_SIZE; i++)sprintf(buf + i * 2, "%02x", digest[i]);return std::string(buf);}
user.h创建一个用户类
#pragma once#include <iostream>//标准输入输出库#include <vector> #include <string> #include <fstream>#include<sstream>#include "BlockChain.h"#include "sha256.h"using namespace std;class User{public:Blockchain uBlockchain;//当前节点创建一个自己的区块链，因为每个用户都保存一条自己的区块链string batchTX();//打包交易};
user.cpp这里是实现用户的打包交易，通过默克尔树的方式将若干条交易打包。其中300TXdata.txt后面我会贴上，一定注意文件的路径问题，不然可能运行不了。（大神当我没说）。
#include"user.h"string User::batchTX(){ ifstream myfile("300TXdata.txt");//读取txt文档中的300条交易数据 string temp[300]; int i = 0; if (!myfile.is_open()) { cout << "未成功打开文件" << endl; } while (getline(myfile, temp[i++]))//将取出来的第一行放在数组中i的位置然后i++ { //cout << temp[i++] << endl; getline(myfile, temp[i++]);//将取出来的下一行放在数组i后面的位置然后i++ //cout << temp[i] << endl; } for (int i = 0; i < 300; i++)//这是一个伪默克尔树生成过程，为了便于实现，就这样写了。 //实际上真的默克尔树生成也不难，暂时先这样吧。 { stringstream ss;//该对象可以通过<<接收多个数据，保存到ss对象中，并通过str方法，将内容赋给一个string对象 ss << temp[0] << temp[i]; temp[0] = sha256(ss.str()); //cout << temp[0] << endl; } myfile.close(); return temp[0];}
TestforBitcoin.cpp这就是测试程序了，我是假设100个用户中某个用户挖矿成功了，然后来挖矿。实际上不是这样的过程，而是先挖矿才知道是哪个用户挖矿成功，不过对于一个用户来说，都无所谓了，只是为了模拟的逼真一点，加了个随机数。
#include<iostream>#include<cstdint>#include"Blockchain.h"#include"user.h"#include<stdio.h>#include <cstdlib>#include <ctime>#include"time.h"#include"sha256.h"using namespace std;int main(){srand((int)time(0));//随机数种子Blockchain bChain = Blockchain();//首先创建一个区块链User user[100];//创建100个用户int miner_id;for (int i = 0; i < 100000; i++)//十万次出块，记录出块速度{miner_id = rand() % 100;for (int j = 0; j < 100; j++){user[j].uBlockchain = bChain;//把100个节点的区块链初始化。}user[miner_id].uBlockchain = bChain;//对挖矿区块初始化printf("Mining block %d...\n", i);user[miner_id].uBlockchain.AddBlock(Block(i, user[miner_id].batchTX()));bChain = user[miner_id].uBlockchain;printf("Miner ID is %d...\n", miner_id);}system("pause");return 0;}
300dataTX.txt这里包含了300条交易，用户A->用户B的转账，以及金额，这个东西我是用一个程序模拟生成的，如果需要这个这个程序我之后再发出来。
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