[#BIP324Cipher-DecryptLength]
= xref:BIP324Cipher.adoc[BIP324Cipher]::DecryptLength
:relfileprefix: ../
:mrdocs:

Decrypt the length of a packet. Only after Initialize().

== Synopsis

Declared in `<bip324.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unsigned int
DecryptLength(std::span<std::byte const> input) noexcept;
----

== Description

It must hold that input.size() == LENGTH_LEN.

== Return Value

The decrypted length of the packet contents.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The encrypted length field.
|===


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