ngtcp2_conn_install_tx_handshake_key
====================================

Synopsis
--------

*#include <ngtcp2/ngtcp2.h>*

.. function:: int ngtcp2_conn_install_tx_handshake_key( ngtcp2_conn *conn, const ngtcp2_crypto_aead_ctx *aead_ctx, const uint8_t *iv, size_t ivlen, const ngtcp2_crypto_cipher_ctx *hp_ctx)

    
    `ngtcp2_conn_install_tx_handshake_key` installs packet protection
    keying materials for encrypting outgoing Handshake packets.
    *aead_ctx* is AEAD cipher context object which must be initialized
    with an encryption key.  *iv* is IV of length *ivlen*.  *hp_ctx* is
    a packet header protection cipher context object.
    
    *ivlen* must be the minimum length of AEAD nonce, or 8 bytes if
    that is larger.
    
    If this function succeeds, *conn* takes ownership of *aead_ctx* and
    *hp_ctx*.  :member:`ngtcp2_callbacks.delete_crypto_aead_ctx` and
    :member:`ngtcp2_callbacks.delete_crypto_cipher_ctx` will be called
    to delete these objects when they are no longer used.  If this
    function fails, the caller is responsible to delete them.
    
    This function returns 0 if it succeeds, or one of the following
    negative error codes:
    
    :macro:`NGTCP2_ERR_NOMEM`
        Out of memory.