[#FSChaCha20-Crypt]
= xref:FSChaCha20.adoc[FSChaCha20]::Crypt
:relfileprefix: ../
:mrdocs:

Encrypt or decrypt a chunk.

== Synopsis

Declared in `<crypto/chacha20.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
Crypt(
    std::span<std::byte const> input,
    std::span<std::byte> output) noexcept;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The message to encrypt or decrypt.
| *output*
| Output buffer receiving the result; must be the same size as `input.`
|===


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