怎么在C++项目中实现一个区块链?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
void Make_First_Block() { Getpublickey(); blo.data = circle; blo.pre_hash = 0; blo.this_hash = (blo.pre_hash+public_Key) * (a+b); Block.push_back(blo); }
由于在区块链中,本区快的数字签名是基于上一区块的数字签名和区块本身的DATA决定, 所以,在这里我们采用了上一区块的数字签名加上难解的PublicKey乘上长轴和短轴的和实现本区块的数字签名的算法。
添加区块(当当前区块被算出时,添加新区块,检查签名正确性。)
void Append_Block() { pre_blo = blo; bool flag = true; auto temp = public_Key; circle = circle + 1; Getpublickey(); blo.data = circle; blo.pre_hash = blo.this_hash; blo.this_hash = (blo.pre_hash + public_Key) * (a + b); for(list::iterator itor = Block.begin(); itor != Block.end(); itor++) { if ((*itor).this_hash != (*itor).pre_hash + temp * (a + b)) { flag = false; break; } } if (flag) { Block.push_back(blo); }; }
这个迭代其实可以不用的,因为我在外部还定义了一个block类型的全局变量Pre_block和blo。Pre_block存储了上一个区块的信息。而本区块的信息则存储在Blo中。只有当用户解出当前区块后,才可以得到新区块。而data参数,为了方便仅存储了当前区块所在的位置。
区块的计算(用类实现)
class Get_Block :Create_Block { public: int diffcult; int number = 1; Get_Block():Create_Block(“OK”){ } void calc() { double start = clock(); while (true){ for (unsigned long long z = 1; z < ULLONG_MAX; z++){ for (unsigned long long j = 1; j < 65535; j = j + 1) { for (unsigned long long i = 1; i < 65535; i = i + 1) { Cryptography *person = new Cryptography(i,j,z); person->Getpublickey(); block bloc; bloc.data = circle; bloc.pre_hash = pre_blo.this_hash; bloc.this_hash = (blo.pre_hash + person->public_Key) * (i + j); if (blo.data == bloc.data &&blo.pre_hash== bloc.pre_hash && blo.this_hash == bloc.this_hash) { double end = clock(); cout << “历时”<<end-start<<“毫秒获得的第” << number++ <<“个区块信息为:” << endl; cout << “data:” << bloc.data << endl; cout << “this_hash:” << bloc.this_hash << endl; cout << “pre_hash:” << bloc.pre_hash << endl << “=======================” << endl << endl; this->Append_Block(); start = clock(); } delete []person; } } } } } };
完整代码:
#include #include <stdio.h> #include <windows.h> #include #include #include #include #include <time.h> using namespace std; struct Moving_Point { unsigned long long x; unsigned long long y; }; int circle = 1; class Martix { public: static const int circle_s = 1; //假定向量环路为1; static const int KEY =Martix::circle_s * 8; private: unsigned long long martix_4_2[Martix::KEY / 2][2]; //存储向量矩阵 unsigned long long martix_8_8[Martix::KEY][Martix::KEY]; //存储由向量矩阵得到的转置矩阵 unsigned long long martix_complete[KEY * 2]; //存储操作完成后的矩阵(一维) public: Martix(string a) {}; Martix(int a, int b,int circle) { int key = 8; int cir = circle; while (cir–) { martix_4_2[key / 2 - 4][0] = (-1)*b; martix_4_2[key / 2 - 4][1] = (-1)*a; martix_4_2[key / 2 - 3][0] = b; martix_4_2[key / 2 - 3][1] = (-1)*a; martix_4_2[key / 2 - 2][0] = b; martix_4_2[key / 2 - 2][1] = a; martix_4_2[key / 2 - 1][0] = (-1)*b; martix_4_2[key / 2 - 1][1] = a; key += 8; } } void Change_New_Martix() { for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) { martix_8_8[i][j] = 0; } } for (int j = 2; j < KEY / 2 + 2; j++) { martix_8_8[0][j] = martix_4_2[j - 2][0] * (-1); martix_8_8[1][j] = martix_4_2[j - 2][1] * (-1); } for (int i = 2; i < KEY / 2 + 2; i++) { martix_8_8[i][0] = martix_4_2[i - 2][0] * (-1); martix_8_8[i][1] = martix_4_2[i - 2][1] * (-1); } for (int i = 2; i < KEY / 2 + 2; i++) { for (int j = 2; j < KEY / 2 + 2; j++) { martix_8_8[i][j] = 0; } } } public: void Save_Martix() { int key = 0; for (int i = 0; i < KEY / 2 + 2; i++) { for (int j = 0; j < KEY / 2 + 2; j++) { if (martix_8_8[i][j] != 0) { martix_complete[key++] = martix_8_8[i][j]; } } } } unsigned long long GetPublicKey() { unsigned long long public_key = martix_complete[0]; for (int i = 1; i < KEY * 2; i++) { if (i % 2 == 0) { public_key = public_key + martix_complete[i]; } else { public_key = public_key * martix_complete[i]; } } return public_key; } }; class Cryptography :Martix { public: /作为私钥,发送方保存内容/ unsigned long long a; //椭圆长轴的半轴长度 unsigned long long b; //椭圆短轴的半轴长度 /作为公钥,接收方接受公钥/ unsigned long long public_Key; //通过椭圆矩阵算法得到的公钥G Moving_Point p; //随机选定的在椭圆上的点 public: Cryptography(string a) :Martix(“OK”) {}; Cryptography(unsigned long long in_a, unsigned long long in_b,int diffcult) :Martix(in_a, in_b,diffcult) { this->a = in_a; this->b = in_b; p.x = 0; p.y = 0; public_Key = Getpublickey(); } unsigned long long Getpublickey() { Get_Public_Key(); return public_Key; } Moving_Point GetPoint() { Get_Point(); return p; } public: void PrintPrivateKey() { cout << “#############私钥:#############” << endl; cout << “长轴:” << 2this->a << “\t\t”; cout << “短轴:” << 2this->b << endl; } private: void Get_Point() { if (p.x == 0 && p.y == 0) { while (!Is_Moving_Point()) { Get_Moving_Point_P(); } } } void Get_Public_Key() { this->Change_New_Martix(); this->Save_Martix(); this->public_Key = this->GetPublicKey(); } void Get_Moving_Point_P() //得到一个随机的在椭圆上的点的坐标 { for (int i = 0; i < this->a; i++) { for (int j = 0; j < this->b; j++) { p.x = i; p.y = j; } } } bool Is_Moving_Point() { if (pow(b, 2)*pow(p.y, 2) + pow(a, 2)*pow(p.x, 2) == pow(a, 2)*pow(b, 2) && p.y <= a && p.x <= b) return true; else return false; } }; struct block { unsigned long long this_hash; unsigned long long pre_hash; unsigned long long data; }; block blo; block pre_blo = {0,0,0}; class Create_Block:public Cryptography { public: list Block; public: Create_Block(string a):Cryptography(“OK”) {}; Create_Block(int x = rand()*2, int y = rand(), int diffcult = 1):Cryptography(x,y,diffcult){ } void Make_First_Block() { Getpublickey(); blo.data = circle; blo.pre_hash = 0; blo.this_hash = (blo.pre_hash+public_Key) * (a+b); Block.push_back(blo); } void Append_Block() { pre_blo = blo; bool flag = true; auto temp = public_Key; circle = circle + 1; Getpublickey(); blo.data = circle; blo.pre_hash = blo.this_hash; blo.this_hash = (blo.pre_hash + public_Key) * (a + b); for(list::iterator itor = Block.begin(); itor != Block.end(); itor++) { if ((*itor).this_hash != (*itor).pre_hash + temp * (a + b)) { flag = false; break; } } if (flag) { Block.push_back(blo); }; } }; class Get_Block :Create_Block { public: int diffcult; int number = 1; Get_Block():Create_Block(“OK”){ } void calc() { double start = clock(); while (true){ for (unsigned long long z = 1; z < ULLONG_MAX; z++){ for (unsigned long long j = 1; j < 65535; j = j + 1) { for (unsigned long long i = 1; i < 65535; i = i + 1) { Cryptography *person = new Cryptography(i,j,z); person->Getpublickey(); block bloc; bloc.data = circle; bloc.pre_hash = pre_blo.this_hash; bloc.this_hash = (blo.pre_hash + person->public_Key) * (i + j); if (blo.data == bloc.data &&blo.pre_hash== bloc.pre_hash && blo.this_hash == bloc.this_hash) { double end = clock(); cout << “历时”<<end-start<<“毫秒获得的第” << number++ <<“个区块信息为:” << endl; cout << “data:” << bloc.data << endl; cout << “this_hash:” << bloc.this_hash << endl; cout << “pre_hash:” << bloc.pre_hash << endl << “=======================” << endl << endl; this->Append_Block(); start = clock(); } delete []person; } } } } } }; int main() { Create_Block * one = new Create_Block(); one->Make_First_Block(); Get_Block* two = new Get_Block(); two->calc(); return 0; }
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