[#OSSL_CMP_transfer_cb_t]
= OSSL_CMP_transfer_cb_t
:mrdocs:

Callback type for sending a CMP request and returning the response message.

== Synopsis

Declared in `<openssl/cmp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:OSSL_CMP_MSG.adoc[OSSL_CMP_MSG]*(* OSSL_CMP_transfer_cb_t)(xref:OSSL_CMP_CTX.adoc[OSSL_CMP_CTX]*, xref:OSSL_CMP_MSG.adoc[OSSL_CMP_MSG] const*);
----

== Return Value

Server response message on success, or NULL on error.

== Parameters

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


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