[#EVP_MAC_names_do_all]
= EVP_MAC_names_do_all
:mrdocs:

Invoke a callback for every name (including aliases) associated with a MAC implementation.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_MAC_names_do_all(
    xref:EVP_MAC.adoc[EVP_MAC] const* mac,
    void(* fn)(char const*, void*),
    void* data);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *mac*
| MAC algorithm whose names are enumerated.
| *fn*
| Callback receiving each name and `data.`
| *data*
| Opaque pointer forwarded to `fn.`
|===


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