使用C++编写一个比特币系统?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
创新互联是一家专注于成都网站建设、网站建设与策划设计,石嘴山网站建设哪家好?创新互联做网站,专注于网站建设十载,网设计领域的专业建站公司;建站业务涵盖:石嘴山等地区。石嘴山做网站价格咨询:18980820575#pragma once #include"Block.h" #include//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 _vChain;//保存区块的变量 Block _GetLastBlock() const;//获取新的区块,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//包含了uint32_t等无符号整型 #include //标准输入输出库 #include 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" #includeBlock::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< 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 #includeclass 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#include #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//标准输入输出库 #include #include #include #include #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#include #include"Blockchain.h" #include"user.h" #include #include #include #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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10110YSXIM 00101XZMOY 63 00000BNOYX 10010AVDFB 71 10110WBNPB 01000VJUVN 80 01111ZXEFN 11110YFTLZ 88 11001ULUVZ 00011TAKCL 97 01111XHTMK 10001WOJSO 5 10100SCKCO 00111RKAJA 13 00000VQBTA 11001UYQZM 22 11110PMAJM 01000PUPPY 30 01101SIRZX 11110SPGGB 38 11011NWIQB 00000NDXWN 47 10111QRHGN 10111PZWEZ 55 00101LFYWY 00111SNNVK 64 10010OBXNK 11001NJELO 72 01100JXNDO 01111QEDBA 80 11100MLETA 00100LSUSM 89 00011HGDKL 10000OOLIX 97 10101KUUAX 00110JKJZB 5 00111NQLQB 11101MYAPN 14 11010IMKHN 01011HTZFZ 22看完上述内容是否对您有帮助呢?如果还想对相关知识有进一步的了解或阅读更多相关文章,请关注创新互联行业资讯频道,感谢您对创新互联网站建设公司,的支持。
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