[#poly1305_donna-poly1305_finish]
= xref:poly1305_donna.adoc[poly1305_donna]::poly1305_finish
:relfileprefix: ../
:mrdocs:

Finish a Poly1305 computation and write the 16‐byte authentication tag.

== Synopsis

Declared in `<crypto/poly1305.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
poly1305_finish(
    poly1305_context* st,
    unsigned char mac[]) noexcept;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| State to finalize.
| *mac*
| Buffer receiving the 16‐byte tag.
|===


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