[#SSL_CTX_set_record_padding_callback]
= SSL_CTX_set_record_padding_callback
:mrdocs:

Install a callback that chooses TLS 1.3 record padding for connections from a context.

== Synopsis

Declared in `<openssl/ssl.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose padding callback is set (copied to new SSL objects by SSL_new).
| *cb*
| Callback receiving record `type` and plaintext `len;` returns padding bytes to add (0 for none), or NULL to clear.
|===


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