[#FSChaCha20-2constructor-0a]
= xref:FSChaCha20.adoc[FSChaCha20]::FSChaCha20
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:mrdocs:

Constructors

== Synopses

Declared in `<crypto/chacha20.h>`

Deleted copy constructor (the secret key must not be duplicated).


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xref:FSChaCha20/2constructor-02.adoc[FSChaCha20](xref:FSChaCha20.adoc[FSChaCha20] const& other) = delete;
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Deleted move constructor (the secret key must not be duplicated).


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xref:FSChaCha20/2constructor-0b.adoc[FSChaCha20](xref:FSChaCha20.adoc[FSChaCha20]&& other) = delete;
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Construct an FSChaCha20 cipher that rekeys every rekey_interval Crypt() calls.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:FSChaCha20/2constructor-07.adoc[FSChaCha20](
    std::span<std::byte const> key,
    uint32_t rekey_interval) noexcept;
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[.small]#xref:FSChaCha20/2constructor-07.adoc[_» more..._]#

== Parameters

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


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