X509_get_X509_PUBKEY
return SCT_CTX_set1_issuer_pubkey(sctx, X509_get_X509_PUBKEY(issuer));
LCRYPTO_USED(X509_get_X509_PUBKEY);
X509_PUBKEY *X509_get_X509_PUBKEY(const X509 *x);
LCRYPTO_ALIAS(X509_get_X509_PUBKEY);
pubkey = (X509_PUBKEY *)X509_get_X509_PUBKEY(cert->x509);