X509_alias_get0
unsigned char *alstr = X509_alias_get0(x, NULL);
name = (char *)X509_alias_get0(cert, &namelen);
name = (char *)X509_alias_get0(cert, &namelen);
alias = X509_alias_get0(x, &i);
unsigned char *X509_alias_get0(X509 *x, int *len);