ngtcp2_crypto_get_path_challenge_data_cb
========================================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: int ngtcp2_crypto_get_path_challenge_data_cb(ngtcp2_conn *conn, uint8_t *data, void *user_data)

    
    `ngtcp2_crypto_get_path_challenge_data_cb` writes unpredictable
    sequence of :macro:`NGTCP2_PATH_CHALLENGE_DATALEN` bytes to *data*
    which is sent with PATH_CHALLENGE frame.
    
    This function can be directly passed to
    :member:`ngtcp2_callbacks.get_path_challenge_data` field.