[#EVP_MAC_CTX_settable_params]
= EVP&lowbar;MAC&lowbar;CTX&lowbar;settable&lowbar;params
:mrdocs:

Return the OSSL&lowbar;PARAM descriptors settable on a live MAC context&period;

== Synopsis

Declared in `&lt;openssl&sol;evp&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OSSL_PARAM.adoc[OSSL&lowbar;PARAM] const*
EVP&lowbar;MAC&lowbar;CTX&lowbar;settable&lowbar;params(xref:EVP_MAC_CTX.adoc[EVP&lowbar;MAC&lowbar;CTX]* ctx);
----

== Return Value

Array of OSSL&lowbar;PARAM descriptors terminated by OSSL&lowbar;PARAM&lowbar;END, or NULL&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| MAC context to query&period;
|===


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