openssl之rsa密钥生成和存储

int save_public_key_from_file(const char* filename,RSA *key) {
	BIO* bio = BIO_new_file(filename, "w");
	if (!bio) return NULL;

	int ret = PEM_write_bio_RSA_PUBKEY(bio, key);
	BIO_free(bio);
	return ret;
}

int save_private_key_from_file(const char* filename, RSA* key) {
	BIO* bio = BIO_new_file(filename, "w");
	if (!bio) return NULL;

	int ret = PEM_write_bio_RSAPrivateKey(bio, key, NULL, NULL, 0, NULL, NULL);
	BIO_free(bio);
	return ret;
}


int openssl_rsa() {
	// 初始化 OpenSSL
	OpenSSL_add_all_algorithms();
	ERR_load_crypto_strings();

	RSA* rsa_key = NULL;
	
	rsa_key=RSA_generate_key(2048, RSA_F4,NULL,NULL);


	int ret=save_public_key_from_file("test_pub.pem",rsa_key);
	printf("ret:%d\r\n",ret);
	ret = save_private_key_from_file("test_pri.pem", rsa_key);
	printf("ret:%d\r\n", ret);
	// 清理
	RSA_free(rsa_key);
	EVP_cleanup();
	CRYPTO_cleanup_all_ex_data();
	ERR_free_strings();

	return 0;
}