[#OSSL_CMP_transfer_cb_t]
= OSSL&lowbar;CMP&lowbar;transfer&lowbar;cb&lowbar;t
:mrdocs:

Callback type for sending a CMP request and returning the response message&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:OSSL_CMP_MSG.adoc[OSSL&lowbar;CMP&lowbar;MSG]*(* OSSL&lowbar;CMP&lowbar;transfer&lowbar;cb&lowbar;t)(xref:OSSL_CMP_CTX.adoc[OSSL&lowbar;CMP&lowbar;CTX]*, xref:OSSL_CMP_MSG.adoc[OSSL&lowbar;CMP&lowbar;MSG] const*);
----

== Return Value

Server response message on success, or NULL on error&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CMP context with transfer settings&period;
| *req*
| Outgoing CMP request message&period;
|===


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