[#EC_KEY_set_ex_data]
= EC_KEY_set_ex_data
:mrdocs:

Store application data on an EC_KEY at CRYPTO_EX index `idx` (deprecated).

== Synopsis

Declared in `<openssl/ec.h>`

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

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

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key receiving the data.
| *idx*
| Index from CRYPTO_get_ex_new_index() for EC_KEY.
| *arg*
| Pointer to store; ownership rules follow CRYPTO_EX_DATA.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#