ngtcp2_crypto_generate_retry_token
==================================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: ngtcp2_ssize ngtcp2_crypto_generate_retry_token( uint8_t *token, const uint8_t *secret, size_t secretlen, uint32_t version, const ngtcp2_sockaddr *remote_addr, ngtcp2_socklen remote_addrlen, const ngtcp2_cid *retry_scid, const ngtcp2_cid *odcid, ngtcp2_tstamp ts)

    
    `ngtcp2_crypto_generate_retry_token` generates a token in the
    buffer pointed by *token* that is sent with Retry packet.  The
    buffer pointed by *token* must have at least
    :macro:`NGTCP2_CRYPTO_MAX_RETRY_TOKENLEN` bytes long.  The
    successfully generated token starts with
    :macro:`NGTCP2_CRYPTO_TOKEN_MAGIC_RETRY`.  *secret* of length
    *secretlen* is a keying material to generate keys to encrypt the
    token.  *version* is QUIC version.  *remote_addr* of length
    *remote_addrlen* is an address of client.  *retry_scid* is a Source
    Connection ID chosen by server, and set in Retry packet.  *odcid*
    is a Destination Connection ID in Initial packet sent by client.
    *ts* is the timestamp when the token is generated.
    
    This function returns the length of generated token if it succeeds,
    or -1.