[#EVP_PKEY_CTX_settable_params]
= EVP&lowbar;PKEY&lowbar;CTX&lowbar;settable&lowbar;params
:mrdocs:

Describe OSSL&lowbar;PARAM keys that may be set on key context `ctx&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;PKEY&lowbar;CTX&lowbar;settable&lowbar;params(xref:EVP_PKEY_CTX.adoc[EVP&lowbar;PKEY&lowbar;CTX] const* ctx);
----

== Return Value

NULL&hyphen;terminated OSSL&lowbar;PARAM descriptor array, or NULL on error&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key operation context&period;
|===


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