linux rsa c++

#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <iostream>
#include <string.h>

void handle_errors() {
    ERR_print_errors_fp(stderr);
    abort();
}

int main() {
    // 初始化OpenSSL库
    OpenSSL_add_all_algorithms();

    // 生成RSA密钥对
    RSA *keypair = RSA_new();
    BIGNUM *e = BN_new();
    BN_set_word(e, RSA_F4);
    if (!RSA_generate_key_ex(keypair, 2048, e, NULL)) {
        handle_errors();
    }
    BN_free(e);

    // 要加密的数据
    const char *message = "Hello, RSA!";
    int message_len = strlen(message);

    // 加密
    int rsa_size = RSA_size(keypair);
    unsigned char *encrypted = (unsigned char *)malloc(rsa_size);
    int result_len = RSA_public_encrypt(message_len, (unsigned char *)message, encrypted, keypair, RSA_PKCS1_PADDING);
    if (result_len == -1) {
        handle_errors();
    }

    // 解密
    unsigned char *decrypted = (unsigned char *)malloc(rsa_size);
    int decrypted_len = RSA_private_decrypt(result_len, encrypted, decrypted, keypair, RSA_PKCS1_PADDING);
    if (decrypted_len == -1) {
        handle_errors();
    }

    decrypted[decrypted_len] = '\0';
    std::cout << "Decrypted message: " << decrypted << std::endl;

    // 清理资源
    free(encrypted);
    free(decrypted);
    RSA_free(keypair);
    EVP_cleanup();

    return 0;
}

g++ -o rsa_example rsa_example.cpp -lssl -lcrypto
./rsa_example