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

Process message bytes.

== Synopsis

Declared in `<crypto/poly1305.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:Poly1305.adoc[Poly1305]&
Update(std::span<std::byte const> msg) noexcept;
----

== Return Value

Reference to this object, to allow chaining.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *msg*
| The message bytes to authenticate.
|===


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