[#ChaCha20]
= ChaCha20
:mrdocs:

Unrestricted ChaCha20 cipher.

== Synopsis

Declared in `<crypto/chacha20.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class ChaCha20;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:ChaCha20/Nonce96.adoc[`Nonce96`] 
| 96‐bit nonce type.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:ChaCha20/2constructor-00.adoc[`ChaCha20`]         [.small]#[constructor]#
| Constructors
| xref:ChaCha20/2destructor.adoc[`~ChaCha20`] [.small]#[destructor]#
| Destructor to clean up private memory.
| xref:ChaCha20/Crypt.adoc[`Crypt`] 
| en/deciphers the message <in_bytes> and write the result into <out_bytes>
| xref:ChaCha20/Keystream.adoc[`Keystream`] 
| outputs the keystream to out.
| xref:ChaCha20/Seek.adoc[`Seek`] 
| Set the 96‐bit nonce and 32‐bit block counter. See ChaCha20Aligned::Seek.
| xref:ChaCha20/SetKey.adoc[`SetKey`] 
| Set 32‐byte key, and seek to nonce 0 and block position 0.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:ChaCha20/KEYLEN.adoc[`KEYLEN`] 
| Expected key length in constructor and SetKey.
|===



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