[#poly1305_donna-poly1305_update]
= xref:poly1305_donna.adoc[poly1305_donna]::poly1305_update
:relfileprefix: ../
:mrdocs:

Feed message bytes into a Poly1305 state.

== Synopsis

Declared in `<crypto/poly1305.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
poly1305_update(
    poly1305_context* st,
    unsigned char const* m,
    size_t bytes) noexcept;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| State to update.
| *m*
| Pointer to the message bytes.
| *bytes*
| Number of message bytes to process.
|===


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