[#SSL_CTX_set_cookie_generate_cb]
= SSL_CTX_set_cookie_generate_cb
:mrdocs:

Set the callback that generates DTLS HelloVerifyRequest cookies.

== Synopsis

Declared in `<openssl/ssl.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| DTLS SSL context that uses DTLSv1_listen.
| *app_gen_cookie_cb*
| Callback that writes at most DTLS1_COOKIE_LENGTH bytes into cookie and sets cookie_len.
|===


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