[#FSChaCha20]
= FSChaCha20
:mrdocs:

Forward‐secure ChaCha20

== Synopsis

Declared in `<crypto/chacha20.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class FSChaCha20;
----

== Description

This implements a stream cipher that automatically transitions to a new stream with a new key and new nonce after a predefined number of encryptions or decryptions.

See BIP324 for details.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:FSChaCha20/2constructor-0a.adoc[`FSChaCha20`]         [.small]#[constructor]#
| Constructors
| xref:FSChaCha20/operator_assign-08.adoc[`operator=`] 
| Assignment operators
| xref:FSChaCha20/Crypt.adoc[`Crypt`] 
| Encrypt or decrypt a chunk.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:FSChaCha20/KEYLEN.adoc[`KEYLEN`] 
| Length of keys expected by the constructor.
|===



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