[#CRYPTO_ccm128_aad]
= CRYPTO&lowbar;ccm128&lowbar;aad
:mrdocs:

Absorb additional authenticated data into a CCM context&period;

== Synopsis

Declared in `&lt;openssl&sol;modes&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
CRYPTO&lowbar;ccm128&lowbar;aad(
    xref:CCM128_CONTEXT-0c.adoc[CCM128&lowbar;CONTEXT]* ctx,
    unsigned char const* aad,
    size&lowbar;t alen);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CCM context with nonce already set via CRYPTO&lowbar;ccm128&lowbar;setiv()&period;
| *aad*
| Additional authenticated data octets&period;
| *alen*
| Length of `aad` in bytes&period;
|===


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