125606
数字签名程序设计。要求:
(1)对任意字符串及任意文件进行签名与验证签名。
(2)简单用户界面,密钥对生成,输入任意字符串或选择的任意文件,生成签名。
(3)对签名文件进行签名验证。
算法用rsa或者dsa都行,两天时间,预算150
C++或者c++都可以
您可以使用RSA或DSA算法来设计一个数字签名程序。以下是一个使用C++编程语言实现的简单示例:
#include <iostream> #include <fstream> #include <string> #include <openssl/rsa.h> #include <openssl/pem.h> #include <openssl/err.h> // 生成密钥对 bool generateKeyPair(const std::string& publicKeyPath, const std::string& privateKeyPath) { RSA* rsaKeyPair = RSA_generate_key(2048, RSA_F4, nullptr, nullptr); if (!rsaKeyPair) { return false; } // 保存公钥 FILE* publicKeyFile = fopen(publicKeyPath.c_str(), "wb"); if (!publicKeyFile) { RSA_free(rsaKeyPair); return false; } if (!PEM_write_RSA_PUBKEY(publicKeyFile, rsaKeyPair)) { fclose(publicKeyFile); RSA_free(rsaKeyPair); return false; } fclose(publicKeyFile); // 保存私钥 FILE* privateKeyFile = fopen(privateKeyPath.c_str(), "wb"); if (!privateKeyFile) { RSA_free(rsaKeyPair); return false; } if (!PEM_write_RSAPrivateKey(privateKeyFile, rsaKeyPair, nullptr, nullptr, 0, nullptr, nullptr)) { fclose(privateKeyFile); RSA_free(rsaKeyPair); return false; } fclose(privateKeyFile); RSA_free(rsaKeyPair); return true; } // 签名 bool signFile(const std::string& privateKeyPath, const std::string& filePath, const std::string& signaturePath) { // 读取私钥 FILE* privateKeyFile = fopen(privateKeyPath.c_str(), "rb"); if (!privateKeyFile) { return false; } RSA* rsaPrivateKey = PEM_read_RSAPrivateKey(privateKeyFile, nullptr, nullptr, nullptr); fclose(privateKeyFile); if (!rsaPrivateKey) { return false; } // 读取文件 std::ifstream file(filePath, std::ios::binary); if (!file) { RSA_free(rsaPrivateKey); return false; } // 计算文件哈希值 unsigned char hash[SHA256_DIGEST_LENGTH]; SHA256_CTX sha256; SHA256_Init(&sha256); char buffer[4096]; while (file.read(buffer, sizeof(buffer))) { SHA256_Update(&sha256, buffer, file.gcount()); } SHA256_Final(hash, &sha256); file.close(); // 对哈希值进行签名 unsigned char signature[RSA_size(rsaPrivateKey)]; unsigned int signatureLength; if (RSA_sign(NID_sha256, hash, sizeof(hash), signature, &signatureLength, rsaPrivateKey) != 1) { RSA_free(rsaPrivateKey); return false; } // 保存签名 FILE* signatureFile = fopen(signaturePath.c_str(), "wb"); if (!signatureFile) { RSA_free(rsaPrivateKey); return false; } fwrite(signature, sizeof(unsigned char), signatureLength, signatureFile); fclose(signatureFile); RSA_free(rsaPrivateKey); return true; } // 验证签名 bool verifySignature(const std::string& publicKeyPath, const std::string& filePath, const std::string& signaturePath) { // 读取公钥 FILE* publicKeyFile = fopen(publicKeyPath.c_str(), "rb"); if (!publicKeyFile) { return false; } RSA* rsaPublicKey = PEM_read_RSA_PUBKEY(publicKeyFile, nullptr, nullptr, nullptr); fclose(publicKeyFile); if (!rsaPublicKey) { return false; } // 读取文件 std::ifstream file(filePath, std::ios::binary); if (!file) { RSA_free(rsaPublicKey); return false; } // 计算文件哈希值 unsigned char hash[SHA256_DIGEST_LENGTH]; SHA256_CTX sha256; SHA256_Init(&sha256); char buffer[4096]; while (file.read(buffer, sizeof(buffer))) { SHA256_Update(&sha256, buffer, file.gcount()); } SHA256_Final(hash, &sha256); file.close(); // 读取签名 FILE* signatureFile = fopen(signaturePath.c_str(), "rb"); if (!signatureFile) { RSA_free(rsaPublicKey); return false; } fseek(signatureFile, 0, SEEK_END); long signatureSize = ftell(signatureFile); rewind(signatureFile); unsigned char* signature = new unsigned char[signatureSize]; fread(signature, sizeof(unsigned char), signatureSize, signatureFile); fclose(signatureFile); // 验证签名 if (RSA_verify(NID_sha256, hash, sizeof(hash), signature, signatureSize, rsaPublicKey) != 1) { delete[] signature; RSA_free(rsaPublicKey); return false; } delete[] signature; RSA_free(rsaPublicKey); return true; } int main() { std::cout << "1. 生成密钥对" << std::endl; std::cout << "2. 对文件进行签名" << std::endl; std::cout << "3. 对签名文件进行验证" << std::endl; std::cout << "请选择操作:"; int choice; std::cin >> choice; if (choice == 1) { std::string publicKeyPath = "public_key.pem"; std::string privateKeyPath = "private_key.pem"; if (generateKeyPair(publicKeyPath, privateKeyPath)) { std::cout << "密钥对生成成功!" << std::endl; } else { std::cout << "密钥对生成失败!" << std::endl; } return 0; } std::string publicKeyPath = "public_key.pem"; std::string privateKeyPath = "private_key.pem"; std::string filePath = "file.txt"; std::string signaturePath = "signature.bin"; if (choice == 2) { if (signFile(privateKeyPath, filePath, signaturePath)) { std::cout << "文件签名成功!" << std::endl; } else { std::cout << "文件签名失败!" << std::endl; } } else if (choice == 3) { if (verifySignature(publicKeyPath, filePath, signaturePath)) { std::cout << "签名验证通过!" << std::endl; } else { std::cout << "签名验证失败!" << std::endl; } } return 0; }
请确保您已经安装OpenSSL库,并将OpenSSL的include和lib目录添加到编译器的搜索路径中。
这个示例程序提供了生成密钥对、对文件进行签名以及对签名文件进行验证的功能。您可以根据需要修改文件路径和名称。
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