[#poly1305_donna-poly1305_context]
= xref:poly1305_donna.adoc[poly1305_donna]::poly1305_context
:relfileprefix: ../
:mrdocs:

Incremental state for a Poly1305 one‐time authenticator computation.

== Synopsis

Declared in `<crypto/poly1305.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct poly1305_context;
----

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:poly1305_donna/poly1305_context/buffer.adoc[`buffer`] 
| Buffer holding a partial input block.
| xref:poly1305_donna/poly1305_context/final.adoc[`final`] 
| Non‐zero once the final block has been processed.
| xref:poly1305_donna/poly1305_context/h.adoc[`h`] 
| Running accumulator, split into 26‐bit limbs.
| xref:poly1305_donna/poly1305_context/leftover.adoc[`leftover`] 
| Number of buffered bytes not yet processed.
| xref:poly1305_donna/poly1305_context/pad.adoc[`pad`] 
| Key portion s added to the accumulator at the end.
| xref:poly1305_donna/poly1305_context/r.adoc[`r`] 
| Clamped key portion r, split into 26‐bit limbs.
|===



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