X509_EXTENSION_get_data
preextdata = X509_EXTENSION_get_data(preext);
LCRYPTO_USED(X509_EXTENSION_get_data);
ASN1_OCTET_STRING *X509_EXTENSION_get_data(X509_EXTENSION *ne);
LCRYPTO_ALIAS(X509_EXTENSION_get_data);
exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
sanasn1data = X509_EXTENSION_get_data(subjectaltname);