How to add a certificate from buffer in OpenSSL

gistfile1.txt

X509 *cert;
char *zCert;
BIO *mem;

zCert = // get your certificate text buffer here (C string with certificate in PEM format)
mem = BIO_new(BIO_s_mem());
BIO_puts(mem, zCert);
cert = PEM_read_bio_X509(mem, NULL, 0, NULL);
free(zCert);
BIO_free(mem); 

// set certificate to sslCtx
X509_STORE_add_cert(SSL_CTX_get_cert_store(sslCtx), cert);

for anyone else who comes looking, if you have more than one pem file in zCert, you'll need to loop.

while (cert = PEM_read_bio_X509(mem, NULL, 0, NULL)) {
    X509_STORE_add_cert(SSL_CTX_get_cert_store(sslCtx), cert);
}

It's indeed a good solution, I was not aware about it and was struggling to create store/stack from certificate chain.
Cheers!

I believe that to prevent a memory leak you need X509_free(cert);