[#ENGINE_DIGESTS_PTR]
= ENGINE_DIGESTS_PTR
:mrdocs:

ENGINE digests handler: list supported NIDs or return an EVP_MD for a NID.

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* ENGINE_DIGESTS_PTR)(xref:ENGINE.adoc[ENGINE]*, xref:EVP_MD.adoc[EVP_MD] const**, int const**, int);
----

== Description

Called as foo(e, &md, NULL, nid) to fetch a digest, or foo(e, NULL, &nids, 0) to list supported NIDs (returns the count, or a negative value on error).


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