[#ChaCha20Aligned-Keystream]
= xref:ChaCha20Aligned.adoc[ChaCha20Aligned]::Keystream
:relfileprefix: ../
:mrdocs:

outputs the keystream into out, whose length must be a multiple of BLOCKLEN.

== Synopsis

Declared in `<crypto/chacha20.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Output buffer receiving the keystream; its length must be a multiple of BLOCKLEN.
|===


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