[#CRYPTO_get_ex_data]
= CRYPTO_get_ex_data
:mrdocs:

Retrieve the pointer stored at ex_data index `idx.`

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
CRYPTO_get_ex_data(
    xref:CRYPTO_EX_DATA.adoc[CRYPTO_EX_DATA] const* ad,
    int idx);
----

== Return Value

Stored pointer, or NULL if unset / out of range.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ad*
| Ex‐data bag to query.
| *idx*
| Index from CRYPTO_get_ex_new_index() (or a class helper).
|===


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