OpenSSL介绍
OpenSSL安装
https://blog.csdn.net/zhizhengguan/article/details/112846817
OpenSSL实例
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>#pragma comment(lib, "libssl.lib")
#pragma comment(lib, "libcrypto.lib")extern "C" {
#include <openssl/applink.c>
}// 加密函数
int encrypt_rsa(const char* public_key_path, const unsigned char* plain_text, int plain_text_len, unsigned char** cipher_text, int* cipher_text_len) {FILE* public_key_file = fopen(public_key_path, "rb");if (!public_key_file) {perror("Failed to open public key file");return 0;}RSA* rsa = PEM_read_RSA_PUBKEY(public_key_file, NULL, NULL, NULL);if (!rsa) {ERR_print_errors_fp(stderr);fclose(public_key_file);return 0;}fclose(public_key_file);*cipher_text = (unsigned char*)malloc(RSA_size(rsa));*cipher_text_len = RSA_public_encrypt(plain_text_len, plain_text, *cipher_text, rsa, RSA_PKCS1_PADDING);RSA_free(rsa);if (*cipher_text_len == -1) {ERR_print_errors_fp(stderr);return 0;}return 1;
}// 解密函数
int decrypt_rsa(const char* private_key_path, const unsigned char* cipher_text, int cipher_text_len, unsigned char** decrypted_text, int* decrypted_text_len) {FILE* private_key_file = fopen(private_key_path, "rb");if (!private_key_file) {perror("Failed to open private key file");return 0;}RSA* rsa = PEM_read_RSAPrivateKey(private_key_file, NULL, NULL, NULL);if (!rsa) {ERR_print_errors_fp(stderr);fclose(private_key_file);return 0;}fclose(private_key_file);*decrypted_text = (unsigned char*)malloc(RSA_size(rsa));*decrypted_text_len = RSA_private_decrypt(cipher_text_len, cipher_text, *decrypted_text, rsa, RSA_PKCS1_PADDING);RSA_free(rsa);if (*decrypted_text_len == -1) {ERR_print_errors_fp(stderr);return 0;}return 1;
}int main() {const char* public_key_path = "public_key.pem";const char* private_key_path = "private_key.pem";const unsigned char* plain_text = (const unsigned char*)"Hello, RSA encryption!";int plain_text_len = strlen((const char*)plain_text);unsigned char* cipher_text = NULL;int cipher_text_len = 0;unsigned char* decrypted_text = NULL;int decrypted_text_len = 0;// 加密if (encrypt_rsa(public_key_path, plain_text, plain_text_len, &cipher_text, &cipher_text_len)) {printf("Encryption successful.\n");printf("Cipher Text: ");for (int i = 0; i < cipher_text_len; i++) {printf("%02x", cipher_text[i]);}printf("\n");// 解密if (decrypt_rsa(private_key_path, cipher_text, cipher_text_len, &decrypted_text, &decrypted_text_len)) {printf("Decryption successful.\n");printf("Decrypted Text: %s\n", decrypted_text);free(decrypted_text);}else {printf("Decryption failed.\n");}free(cipher_text);}else {printf("Encryption failed.\n");}return 0;
}
利用OpenSSL生成公钥与私钥
openssl genpkey -algorithm RSA -out private_key.pem
openssl rsa -pubout -in private_key.pem -out public_key.pem
运行结果
Encryption successful.
Cipher Text: 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
Decryption successful.
Decrypted Text: Hello, RSA encryption!
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