[#ChaCha20-SetKey]
= xref:ChaCha20.adoc[ChaCha20]::SetKey
:relfileprefix: ../
:mrdocs:

Set 32‐byte key, and seek to nonce 0 and block position 0.

== Synopsis

Declared in `<crypto/chacha20.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| The 32‐byte key.
|===


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