[#ENGINE_by_id]
= ENGINE_by_id
:mrdocs:

Look up a registered ENGINE by its unique id string (deprecated).

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:ENGINE.adoc[ENGINE]*
ENGINE_by_id(char const* id);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Structural reference to the ENGINE, or NULL if not found; free with ENGINE_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *id*
| ENGINE identifier (for example "dynamic" or a built‐in engine id).
|===


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