[#FSChaCha20-2constructor-07]
= xref:FSChaCha20.adoc[FSChaCha20]::FSChaCha20
:relfileprefix: ../
:mrdocs:

Construct an FSChaCha20 cipher that rekeys every rekey_interval Crypt() calls.

== Synopsis

Declared in `<crypto/chacha20.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
FSChaCha20(
    std::span<std::byte const> key,
    uint32_t rekey_interval) noexcept;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| The 32‐byte key.
| *rekey_interval*
| The number of Crypt() calls between automatic rekeys.
|===


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