ngtcp2_crypto_hkdf_expand
=========================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: int ngtcp2_crypto_hkdf_expand(uint8_t *dest, size_t destlen, const ngtcp2_crypto_md *md, const uint8_t *secret, size_t secretlen, const uint8_t *info, size_t infolen)

    
    `ngtcp2_crypto_hkdf_expand` performs HKDF expand operation.  The
    result is *destlen* bytes long, and is stored in the buffer pointed
    by *dest*.
    
    This function returns 0 if it succeeds, or -1.