[#HMAC_size]
= HMAC_size
:mrdocs:

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

== Synopsis

Declared in `<openssl/hmac.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
size_t
HMAC_size(xref:HMAC_CTX.adoc[HMAC_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.

== Parameters

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


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