int X509_check_issued(X509 *issuer, X509 *subject);
int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid);
void X509_set_proxy_flag(X509 *x);
int X509_check_issued(X509 *issuer, X509 *subject);
int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid);
void X509_set_proxy_flag(X509 *x);