ngtcp2_crypto_aead_keylen
=========================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: size_t ngtcp2_crypto_aead_keylen(const ngtcp2_crypto_aead *aead)

    
    `ngtcp2_crypto_aead_keylen` returns the length of key for *aead*.