[#OSSL_CMP_MSG_get0_header]
= OSSL&lowbar;CMP&lowbar;MSG&lowbar;get0&lowbar;header
:mrdocs:

Return the PKIHeader from a CMP message&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OSSL_CMP_PKIHEADER.adoc[OSSL&lowbar;CMP&lowbar;PKIHEADER]*
OSSL&lowbar;CMP&lowbar;MSG&lowbar;get0&lowbar;header(xref:OSSL_CMP_MSG.adoc[OSSL&lowbar;CMP&lowbar;MSG] const* msg);
----

== Return Value

Internal PKIHeader pointer, or NULL on error&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *msg*
| CMP message to query&period;
|===


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