[#ChaCha20-2constructor-00]
= xref:ChaCha20.adoc[ChaCha20]::ChaCha20
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Constructors

== Synopses

Declared in `<crypto/chacha20.h>`

For safety, disallow initialization without key.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:ChaCha20/2constructor-09.adoc[ChaCha20]() noexcept = delete;
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[.small]#xref:ChaCha20/2constructor-09.adoc[_» more..._]#

Initialize a cipher with specified 32‐byte key.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:ChaCha20/2constructor-05.adoc[ChaCha20](std::span<std::byte const> key) noexcept;
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[.small]#xref:ChaCha20/2constructor-05.adoc[_» more..._]#

== Parameters

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


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