[#HMAC_Final]
= HMAC_Final
:mrdocs:

Finalize an HMAC computation and write the MAC.

== Synopsis

Declared in `<openssl/hmac.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
HMAC_Final(
    xref:HMAC_CTX.adoc[HMAC_CTX]* ctx,
    unsigned char* md,
    unsigned int* len);
----

[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 error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| HMAC context to finalize.
| *md*
| Output buffer for the MAC.
| *len*
| Receives the MAC length in bytes; may be NULL.
|===


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