ngtcp2_crypto_recv_retry_cb
===========================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: int ngtcp2_crypto_recv_retry_cb(ngtcp2_conn *conn, const ngtcp2_pkt_hd *hd, void *user_data)

    
    `ngtcp2_crypto_recv_retry_cb` re-installs initial secrets in
    response to incoming Retry packet.
    
    This function can be directly passed to
    :member:`ngtcp2_callbacks.recv_retry` field.  It is only used by
    client.
    
    This function returns 0 if it succeeds, or
    :macro:`NGTCP2_ERR_CALLBACK_FAILURE`.