[#HMAC_size]
= HMAC&lowbar;size
:mrdocs:

Return the output length in bytes of the digest used by an HMAC context (deprecated)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;deprecated&rsqb;&rsqb;
size&lowbar;t
HMAC&lowbar;size(xref:HMAC_CTX.adoc[HMAC&lowbar;CTX] const* e);
----

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

Digest output size in bytes, or 0 if `e` has no digest set&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| HMAC context whose underlying hash size is queried&period;
|===


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