[#ChaCha20Aligned-Seek]
= xref:ChaCha20Aligned.adoc[ChaCha20Aligned]::Seek
:relfileprefix: ../
:mrdocs:

Set the 96‐bit nonce and 32‐bit block counter.

== Synopsis

Declared in `<crypto/chacha20.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
Seek(
    xref:ChaCha20Aligned/Nonce96.adoc[Nonce96] nonce,
    uint32_t block_counter) noexcept;
----

== Description

Block_counter selects a position to seek to (to byte BLOCKLEN*block_counter). After 256 GiB, the block counter overflows, and nonce.first is incremented.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *nonce*
| The 96‐bit nonce to seek to.
| *block_counter*
| The 32‐bit block counter selecting the position within the stream.
|===


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