[#SSL_CTX_set_post_handshake_auth]
= SSL_CTX_set_post_handshake_auth
:mrdocs:

Enable or disable sending the TLSv1.3 Post‐Handshake Authentication ClientHello extension.

== Synopsis

Declared in `<openssl/ssl.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Client SSL context; non‐zero `val` includes the extension so the server may request PHA.
| *val*
| Non‐zero to advertise post‐handshake authentication support; 0 to omit the extension (default).
|===


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