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使用C++編寫一個比特幣系統？很多新手對此不是很清楚，為了幫助大家解決這個難題，下面小編將為大家詳細講解，有這方面需求的人可以來學習下，希望你能有所收獲。
#pragma once
#include"Block.h"
#include<vector>//向量庫
class Blockchain
{
public:
Blockchain();//默認構造函數
void AddBlock(Block bNew);//增加區塊函數
uint32_t _nDifficulty;//難度值
vector<Block> _vChain;//保存區塊的變量
Block _GetLastBlock() const;//獲取最新的區塊，由const關鍵字，表示輸出的內容不可更改
};Blockchain.cpp修改難度值在這里修改Blockchain的構造函數中的nDifficulty就可以了。
#include"Blockchain.h"
Blockchain::Blockchain()
{
_vChain.emplace_back(Block(0, "Genesis Block"));
_nDifficulty = 4;//難度值設置3基本上秒出結果，4可以看出差距，5大約要等2分鐘左右。
}
void Blockchain::AddBlock(Block bNew)
{
bNew.sPrevHash = _GetLastBlock().GetHash();
bNew.MineBlock(_nDifficulty);
_vChain.push_back(bNew);
bNew.WriteBlcokToTXT();//調用區塊類中的寫文件方法
}
Block Blockchain::_GetLastBlock() const
{
return _vChain.back();
}Block.h這里是聲明區塊類
#pragma once
#include<cstdint>//包含了uint32_t等無符號整型
#include<iostream>//標準輸入輸出庫
#include <fstream>
using namespace std;
static time_t first_time = 0;//這個地方是為了記錄每個區塊產生距離第一個區塊的時間而設置的全局變量
//創建區塊類
class Block
{
public:
string sPrevHash;//前一個區塊的哈希值
Block(uint32_t nIndexIn, const string& sDataIn);//構造函數
string GetHash();//返回哈希值
void MineBlock(uint32_t nDifficulty);//挖礦，其參數nDifficulty表示指定的難度值
void NoMineBlock();//不挖礦直接添加區塊
uint32_t _nIndex;//區塊索引值，第幾個區塊，從0開始計算
int64_t _nNonce;//區塊隨機數
string _sData;//區塊描述字符
string _sHash;//區塊Hash值
time_t _tTime;//區塊生成時間
string _CalculateHash() const;//計算Hash值，const保證輸出的函數值不能被改變。
void WriteBlcokToTXT();//將區塊數據寫入到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)
//構造函數Block的兩個參數為nIndexIn和sDataIn，分別賦值到Block中的_nIndex和_sData（構造函數初始化用法）
{
_nNonce = -1;//Nounce設置為-1
_tTime = time(nullptr);//設置時間
if (nIndexIn == 0)//此處整個時間記錄下來是為了記錄當前區塊生成所需要的時間，而不是當前時間
first_time = _tTime;
}
string Block::GetHash()//返回哈希值函數的實現
{
return _sHash;
}
void Block::MineBlock(uint32_t nDifficulty)//挖礦函數，參數為難度值。
{
//char cstr[nDifficulty + 1];
char cstr[10 + 1];//這個數組實際上設置多大都可以，但是要大于nDifficulty的值
for (uint32_t i = 0; i < nDifficulty; ++i)//填充數組，使數組的前nDifficulty位都為0，作為難度。
{
cstr[i] = '0';
}
cstr[nDifficulty] = '\0';
string str(cstr);//創建一個string類的對象，初始化為cstr（將字符串數組轉換為string類對象）
do
{
_nNonce++;
_sHash = _CalculateHash();
} while (_sHash.substr(0, nDifficulty) != str);//substr表示從下標0開始--->nDifficulty的內容
//要尋找一個Nounce使得總體哈希值的前n位的0（即0的個數）和難度值的個數相同，則挖礦成功。
cout << "Block mined:" << _sHash << endl;
}
inline string Block::_CalculateHash() const
{
stringstream ss;//該對象可以通過<<接收多個數據，保存到ss對象中，并通過str方法，將內容賦給一個string對象
ss << _nIndex << _tTime << _sData << _nNonce << sPrevHash;
//return sha256(ss.str());
return sha256(sha256(ss.str()));
}
void Block::WriteBlcokToTXT()//將生成的區塊數據輸出到一個txt文檔中來保存路徑自己改
{
ofstream outfile("out.txt", ios::app);//此處修改保存區塊數據的路徑
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 這是一個哈希算法，沒什么說的，網上抄的，這個東西我到現在也沒看懂，太深奧了。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); \
}
#endifsha256.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創建一個用戶類
#pragma once
#include <iostream>//標準輸入輸出庫
#include <vector>
#include <string>
#include <fstream>
#include<sstream>
#include "BlockChain.h"
#include "sha256.h"
using namespace std;
class User
{
public:
Blockchain uBlockchain;//當前節點創建一個自己的區塊鏈，因為每個用戶都保存一條自己的區塊鏈
string batchTX();//打包交易
};user.cpp這里是實現用戶的打包交易，通過默克爾樹的方式將若干條交易打包。其中300TXdata.txt后面我會貼上，一定注意文件的路徑問題，不然可能運行不了。（大神當我沒說）。
#include"user.h"
string User::batchTX()
{
ifstream myfile("300TXdata.txt");//讀取txt文檔中的300條交易數據
string temp[300];
int i = 0;
if (!myfile.is_open())
{
cout << "未成功打開文件" << endl;
}
while (getline(myfile, temp[i++]))//將取出來的第一行放在數組中i的位置然后i++
{
//cout << temp[i++] << endl;
getline(myfile, temp[i++]);//將取出來的下一行放在數組i后面的位置然后i++
//cout << temp[i] << endl;
}
for (int i = 0; i < 300; i++)//這是一個偽默克爾樹生成過程，為了便于實現，就這樣寫了。
//實際上真的默克爾樹生成也不難，暫時先這樣吧。
{
stringstream ss;//該對象可以通過<<接收多個數據，保存到ss對象中，并通過str方法，將內容賦給一個string對象
ss << temp[0] << temp[i];
temp[0] = sha256(ss.str());
//cout << temp[0] << endl;
}
myfile.close();
return temp[0];
}TestforBitcoin.cpp這就是測試程序了，我是假設100個用戶中某個用戶挖礦成功了，然后來挖礦。實際上不是這樣的過程，而是先挖礦才知道是哪個用戶挖礦成功，不過對于一個用戶來說，都無所謂了，只是為了模擬的逼真一點，加了個隨機數。
#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));//隨機數種子
Blockchain bChain = Blockchain();//首先創建一個區塊鏈
User user[100];//創建100個用戶
int miner_id;
for (int i = 0; i < 100000; i++)//十萬次出塊，記錄出塊速度
{
miner_id = rand() % 100;
for (int j = 0; j < 100; j++)
{
user[j].uBlockchain = bChain;//把100個節點的區塊鏈初始化。
}
user[miner_id].uBlockchain = bChain;//對挖礦區塊初始化
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這里包含了300條交易，用戶A->用戶B的轉賬，以及金額，這個東西我是用一個程序模擬生成的，如果需要這個這個程序我之后再發出來。
01100SUSPE 10111ZKHWI 79 10010VQJGH 00100UXYMT 34 00011YMAWT 10010XTPCF 43 10101TZZMF 01110SHOLR 51 01011WVQDR 11101VDFBV 59 11001RRPTU 01011QZWRG 68 11100TFFJG 10101TMVIS 76 00010OBWAS 00001OIMYE 85 10000ROVQD 11010RWCPI 93 01111MKMHH 01100LSBFT 1 11011PGDXT 01010OOSVF 10 01001KUCNF 10011JBRMR 18 10110NQTEQ 00101MXICU 26 00000IDKUU 10011HTZSG 35 10100LZJKG 01000KHYJS 43 01110GVABS 11100FDPZE 52 11001JJQRD 00010IQGPH 60 00101EFPHH 10000DMFGT 68 10111GAGYT 00111GIVWF 77 00000BOFOE 11011BWMNR 85 11110EKWEQ 01001ESLDU 93 01110ZYNVU 11110HNCTG 2 01001CUMLG 00000BBTKS 10 10111XPDCR 10100EXSAD 19 00101ADUSD 01111ZLJQH 27 11001DZTIH 11001CHIHT 35 01110YVJZT 01111XCZXF 44 11100BJAPE 00111AQQNQ 20 00010WFZFQ 10000VMOEU 28 10111ZSQWU 00110YAFUG 37 00101UOHMF 11110TWWLS 45 11011WKGCR 01001WRVBD 54 01101RYXTD 10111RFMRH 62 10000UUWJH 00101UBDIT 70 00010PHNSS 10000OXCYE 79 10100SDEIE 01110RLTOQ 87 01011NZCYQ 11100MGKFU 95 11011QNTPU 01010PUJVG 4 11101LJKFF 10111KQALR 12 00010OEJVR 00101NMYCD 21 10000JSAMD 11011IAPSH 29 01100MORCG 01100LWGIT 37 11010HCQSS 11000GRFZE 46 01001JYHJE 10010JFWPQ 54 10111ETYZQ 00100MBNGU 62 00011HHXQT 10011HPMWF 71 10000CDNGF 01011JLDMR 79 01110FZMWR 11101EGUDD 88 11000ANDND 00010HUTTH 96 00101DIUDG 10000CQJJS 4 10111GWTTS 00100FMAAE 13 00001BSKKE 11011AAZQQ 21 11111EOBAQ 01001DVQGU 29 01110ZCAQT 11111YJPXF 38 01000CXRHF 00011BFGNR 46 10110WTIXR 10000WBXED 55 00101ZHGNC 01110ZPWUG 63 11001UDXEG 11000UKNKS 71 01111XROUS 01101XYEBE 80 11100SMNLE 00111RUCRQ 88 00010VIEBP 10001UQTHT 96 10110QWDRT 00110PEKYF 5 00100TSUIF 11110SZJOR 13 11011OGLYR 01000NVAED 22 01101RBKOC 10110QJRVG 30 11001MXBFG 00101LFQLS 38 00010PLRVS 10001OTHCE 47 10100KHQLD 01111JOGKQ 55 01000MDHCP 11100MKXAT 63 11011HQYST 01010PYNRF 72 11101KMXJF 10110KUMHR 80 00011FAOZQ 00101MQDXC 89 10011IWFPC 11011HDUOG 97 00100DSEGG 01101KZTES 5 11010GFVWS 11001FNKUE 14 01000JBUMD 10010IJBLP 22 10101EXKDP 00100DFABT 30 00011HLBTT 10010GSRRF 39 10001CHAJE 01011BOIIR 47 01111FVRAQ 11101ECGYC 56 11010ZQIQC 00011ZYXPG 64 01000CMHHG 10010CUWFS 72 10110XAYXR 00100XHNVD 49 00001AWPND 11010ADEMP 57 11101VKOEP 01000UZDCT 65 01111YFFUT 11101XNUSF 74 01000TBVKE 00011SJLJQ 82 10110WPUBQ 10001VWKZC 91 00110RLLRC 01110QSBPG 99 10000UHKHF 11010TORGS 7 01111PUBYR 01000OCQWD 16 11101SQSOD 00110RYHNP 24 00001NEREP 10001UUGDT 32 10110PAIVS 00101PHXTE 41 00100KWZLE 11111SDOKQ 49 11010NJYCQ 01000NRNAC 58 01111IFOSC 10110PNEQG 66 11101LBFIF 00110KJVHR 74 00011OPEZR 10001NWUXD 83 10101JLVHD 01111ISKNP 91 01000MYMXP 11101LOBET 99 11010HULOS 01001GCAUE 8 11100KQCEE 10110JYRLQ 16 00011FEBUQ 00100ELIBC 25 10011IASLB 11010HHHRF 33 00101CVJBF 01111CDYIR 41 11010FJHSR 11101FRXYD 50 01000AFYID 10011ANOOP 58 10100DTPYO 00100CAFFS 66 00010YPOPS 10000XWDVE 75 10001BKFFE 01010ASULQ 83 01111WYWVQ 11100VGLCC 92 11011ZUVMB 00011YCKSF 0 01000UIMCF 10011TXBIR 8 10110XEDSR 00101WLSZD 17 00000SZCJC 11010RHRPP 25 11001VNSZO 01000UVIGS 33 01111QJRQS 11100XRZWE 42 11001SFIGE 00011SMYMQ 50 10101NTZWP 10001VAODB 59 00110QOYNB 00111QWNTF 67 10000LCPDF 11011SSEJR 75 01110OYGTR 01000NGVAD 84 11111RUFKC 00110QBUQO 92 00001MIWAO 10000LPLGS 0 10111PDNQS 00001OLCXE 9 00101KZLHD 11111JHBNQ 17 11000NNCXP 01001MVSEB 26 01110IJTNB 11111HQJUF 34 11100LXSEF 00110KEHKR 42 00011FTJUQ 10000FAYBC 51 10111IOILC 01110IWPJO 59 01101DCZBO 11111DKOZS 67 11010GYQRS 01001FFFQE 76 01100BMPID 10111ABEGP 84 00000EIGYP 00100DPVWB 93 10010ZDWOB 10000YLMNF 1 00101CRVFE 01110BZLDR 77 11011XNMVQ 11100WUCUC 86 01011AJDLC 10011ZQSKO 94 10100VXCCO 00111UERAS 2 00010YSTSR 10101XAIRD 11 10000SGKJD 01010AWZHP 19 01101VCJZP 11100VKYXB 28 11011QYAPB 01000YFPOF 36 01001TMZGE 10011TTGEQ 44 10111WHPWQ 00101VPFUC 53 00010RDGMC 11011QLWLO 61 11000URFDO 01011TZVBS 69 01110PNWTR 11100OULRD 78 11001SBNJD 00010RQCIP 86 10001NWMAP 10000MEBYB 95 00111QSDQA 00101PASPE 3 10000LGUHE 11011KOJFQ 11 01110OCTXQ 01001NJIVC 20 11110IYKNC 00110IFZMO 28 00000LLAEN 10010LTQCR 36 10111GHZUR 00000GPPSD 45 00101JVQKD 11110IDGJP 53 11001ERPBP 01001DYWZB 62 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