C++生成 RSA 密钥对并读取

我正在尝试使用 openssl 库生成 RSA 密钥对，然后稍后读取相同的密钥。但是，它失败了。有时它会给我这个错误：

错误：0906D06C：PEM 例程：PEM_read_bio：无启动行

有时，它会给我这个错误：

错误：0906D06C：lib(9(：func(109(：原因(108(

生成密钥对并在以后能够读取它的正确方法是什么？这是我的代码。如果运行它，您会发现它正确生成了 RSA 密钥对，但以后无法读取它们。

#include <stdio.h>
#include <iostream>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <exception>
bool generate_key() {
size_t pri_len;            // Length of private key
size_t pub_len;            // Length of public key
char *pri_key;           // Private key in PEM
char *pub_key;           // Public key in PEM
int ret = 0;
RSA *r = NULL;
BIGNUM *bne = NULL;
BIO *bp_public = NULL, *bp_private = NULL;
int bits = 2048;
unsigned long e = RSA_F4;
EVP_PKEY *evp_pbkey = NULL;
EVP_PKEY *evp_pkey = NULL;
BIO *pbkeybio = NULL;
BIO *pkeybio = NULL;
// 1. generate rsa key
bne = BN_new();
ret = BN_set_word(bne, e);
if (ret != 1) {
goto free_all;
}
r = RSA_new();
ret = RSA_generate_key_ex(r, bits, bne, NULL);
if (ret != 1) {
goto free_all;
}
// 2. save public key
//bp_public = BIO_new_file("public.pem", "w+");
bp_public = BIO_new(BIO_s_mem());
ret = PEM_write_bio_RSAPublicKey(bp_public, r);
if (ret != 1) {
goto free_all;
}
// 3. save private key
//bp_private = BIO_new_file("private.pem", "w+");
bp_private = BIO_new(BIO_s_mem());
ret = PEM_write_bio_RSAPrivateKey(bp_private, r, NULL, NULL, 0, NULL, NULL);
//4. Get the keys are PEM formatted strings
pri_len = BIO_pending(bp_private);
pub_len = BIO_pending(bp_public);
pri_key = (char*) malloc(pri_len + 1);
pub_key = (char*) malloc(pub_len + 1);
BIO_read(bp_private, pri_key, pri_len);
BIO_read(bp_public, pub_key, pub_len);
pri_key[pri_len] = '';
pub_key[pub_len] = '';
printf("n%sn%sn", pri_key, pub_key);
//verify if you are able to re-construct the keys
pbkeybio = BIO_new_mem_buf((void*) pub_key, -1);
if (pbkeybio == NULL) {
return -1;
}
evp_pbkey = PEM_read_bio_PUBKEY(pbkeybio, &evp_pbkey, NULL, NULL);
if (evp_pbkey == NULL) {
char buffer[120];
ERR_error_string(ERR_get_error(), buffer);
printf("Error reading public key:%sn", buffer);
}
pkeybio = BIO_new_mem_buf((void*) pri_key, -1);
if (pkeybio == NULL) {
return -1;
}
evp_pkey = PEM_read_bio_PrivateKey(pkeybio, &evp_pkey, NULL, NULL);
if (evp_pbkey == NULL) {
char buffer[120];
ERR_error_string(ERR_get_error(), buffer);
printf("Error reading private key:%sn", buffer);
}
BIO_free(pbkeybio);
BIO_free(pkeybio);
// 4. free
free_all:
BIO_free_all(bp_public);
BIO_free_all(bp_private);
RSA_free(r);
BN_free(bne);
return (ret == 1);
}
int main(int argc, char* argv[]) {
generate_key();
return 0;
}