[#EC_KEY_get_ex_data]
= EC_KEY_get_ex_data
:mrdocs:

Retrieve application data previously stored on an EC_KEY (deprecated).

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void*
EC_KEY_get_ex_data(
    xref:EC_KEY.adoc[EC_KEY] const* key,
    int idx);
----

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

Stored pointer, or NULL if unset.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| EC key to query.
| *idx*
| Index obtained from EC_KEY_get_ex_new_index().
|===


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