[#CRYPTO_ccm128_aad]
= CRYPTO_ccm128_aad
:mrdocs:

Absorb additional authenticated data into a CCM context.

== Synopsis

Declared in `<openssl/modes.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
CRYPTO_ccm128_aad(
    xref:CCM128_CONTEXT-0c.adoc[CCM128_CONTEXT]* ctx,
    unsigned char const* aad,
    size_t alen);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CCM context with nonce already set via CRYPTO_ccm128_setiv().
| *aad*
| Additional authenticated data octets.
| *alen*
| Length of `aad` in bytes.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#