openssl - X509* certificate serialization and deserialization in C -

i have certificate in 509* format , want serialize char buffer , later desserialize in other recover certificate 509* again.

i doing serialize:

int size_cert = 0; unsigned char* data; bio* bio = bio_new(bio_s_mem()); pem_write_bio_x509(bio,certificate); size_cert = bio_get_mem_data(bio, &data); bio_free(bio); 

where data should have certificate data!

to reconstruct x509* certificate data buffer doing this:

    bio* bio;     x509* cert;      bio = bio_new(bio_s_mem());     bio_puts(bio, data);     cert = pem_read_bio_x509(bio, null, null, null);     

where cert should certificate. not working properly, can 1 give me example this?

i have done below code,

1 load certificate bio using bio_read_filename

2 convert x509 using pem_read_bio_x509_aux

3 convert unsigned char* using i2d_x509

4 reconstruct x509 unsigned char* using d2i_x509

int main() {        x509 *x509,*x509ser;         bio *certbio = bio_new(bio_s_file());        char * path = "e:\\share\tempcert.pem"; // certificate path     int len;     unsigned char *buf;     buf = null;      bio_read_filename(certbio, path); // reading certificate bio     x509 = pem_read_bio_x509_aux(certbio, null, 0, null);  //converting x509       len = i2d_x509(x509, &buf);  // converting unsigned char*     x509ser = d2i_x509(null, &buf, len); // converting x509 unsigned char*      bio_free_all(certbio);      return 0; }