[#SSL_CTX_set_stateless_cookie_generate_cb]
= SSL_CTX_set_stateless_cookie_generate_cb
:mrdocs:

Register the callback that generates cookies for TLS 1.3 HelloRetryRequest / DTLS cookie exchange.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_set_stateless_cookie_generate_cb(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    int(* gen_stateless_cookie_cb)(xref:SSL.adoc[SSL]*, unsigned char*, size_t*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL_CTX that will invoke the callback for stateless cookie generation.
| *gen_stateless_cookie_cb*
| Callback that writes a cookie into `cookie` and sets `cookie_len,` or NULL to clear.
|===


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