[#OSSL_CMP_MSG_get0_header]
= OSSL_CMP_MSG_get0_header
:mrdocs:

Return the PKIHeader from a CMP message.

== Synopsis

Declared in `<openssl/cmp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:OSSL_CMP_PKIHEADER.adoc[OSSL_CMP_PKIHEADER]*
OSSL_CMP_MSG_get0_header(xref:OSSL_CMP_MSG.adoc[OSSL_CMP_MSG] const* msg);
----

== Return Value

Internal PKIHeader pointer, or NULL on error.

== Parameters

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


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