[#ChaCha20Aligned]
= ChaCha20Aligned
:mrdocs:

ChaCha20 cipher that only operates on multiples of 64 bytes.

== Synopsis

Declared in `<crypto/chacha20.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class ChaCha20Aligned;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:ChaCha20Aligned/Nonce96.adoc[`Nonce96`] 
| Type for 96‐bit nonces used by the Set function below.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:ChaCha20Aligned/2constructor-09.adoc[`ChaCha20Aligned`]         [.small]#[constructor]#
| Constructors
| xref:ChaCha20Aligned/2destructor.adoc[`~ChaCha20Aligned`] [.small]#[destructor]#
| Destructor to clean up private memory.
| xref:ChaCha20Aligned/Crypt.adoc[`Crypt`] 
| en/deciphers the message <input> and write the result into <output>
| xref:ChaCha20Aligned/Keystream.adoc[`Keystream`] 
| outputs the keystream into out, whose length must be a multiple of BLOCKLEN.
| xref:ChaCha20Aligned/Seek.adoc[`Seek`] 
| Set the 96‐bit nonce and 32‐bit block counter.
| xref:ChaCha20Aligned/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:ChaCha20Aligned/BLOCKLEN.adoc[`BLOCKLEN`] 
| Block size (inputs/outputs to Keystream / Crypt should be multiples of this).
| xref:ChaCha20Aligned/KEYLEN.adoc[`KEYLEN`] 
| Expected key length in constructor and SetKey.
|===



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