[#EVP_MD_do_all]
= EVP_MD_do_all
:mrdocs:

Invoke a callback for every digest name in the legacy algorithm table.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_MD_do_all(
    void(* fn)(xref:EVP_MD.adoc[EVP_MD] const*, char const*, char const*, void*),
    void* arg);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *fn*
| Callback receiving the EVP_MD (may be NULL for aliases), the registered name, any alias target, and `arg.`
| *arg*
| User pointer passed through to `fn.`
|===


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