[#CMAC_Final]
= CMAC_Final
:mrdocs:

Finish a CMAC and write the authentication tag (deprecated).

== Synopsis

Declared in `<openssl/cmac.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
CMAC_Final(
    xref:CMAC_CTX.adoc[CMAC_CTX]* ctx,
    unsigned char* out,
    size_t* poutlen);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CMAC context updated with CMAC_Update().
| *out*
| Buffer for the MAC (cipher block size), or NULL to query length only.
| *poutlen*
| On entry, capacity of `out;` on success, bytes written (or required).
|===


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