[#Poly1305-Finalize]
= xref:Poly1305.adoc[Poly1305]::Finalize
:relfileprefix: ../
:mrdocs:

Write authentication tag to 16‐byte out.

== Synopsis

Declared in `<crypto/poly1305.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
Finalize(std::span<std::byte> out) noexcept;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Buffer receiving the 16‐byte authentication tag.
|===


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