X509_verify_cert_chain(
	CERT_STORE *cert_store,
	STACK /* X509 */ *certs,
	int *verify_result,
	int (*verify_error_callback)()
	char *argument_to_callback, /* SSL */

app_verify_callback(
	char *app_verify_arg, /* from SSL_CTX */
	STACK /* X509 */ *certs,
	int *verify_result,
	int (*verify_error_callback)()
	SSL *s,

int X509_verify_cert(
	CERT_STORE *cert_store,
	X509 *x509,
	int *verify_result,
	int (*verify_error_callback)(),
	char *arg,