[#CHMAC_SHA256-2constructor]
= xref:CHMAC_SHA256.adoc[CHMAC_SHA256]::CHMAC_SHA256
:relfileprefix: ../
:mrdocs:

Initialize the HMAC with a secret key.

== Synopsis

Declared in `<crypto/hmac_sha256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CHMAC_SHA256(
    unsigned char const* key,
    size_t keylen);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Pointer to the key bytes.
| *keylen*
| Number of key bytes.
|===


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