ngtcp2_crypto_ctx_tls_early
===========================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: ngtcp2_crypto_ctx * ngtcp2_crypto_ctx_tls_early(ngtcp2_crypto_ctx *ctx, void *tls_native_handle)

    
    `ngtcp2_crypto_ctx_tls_early` initializes *ctx* by extracting early
    ciphers and message digests from native TLS session
    *tls_native_handle*.  This is used for encrypting/decrypting 0-RTT
    packets.  If it is unable to obtain necessary data from
    *tls_native_handle*, this function returns NULL.
    
    If libngtcp2_crypto_quictls is linked, *tls_native_handle* must be
    a pointer to SSL object.