[#EVP_PKEY_get_ex_data]
= EVP_PKEY_get_ex_data
:mrdocs:

Retrieve application‐specific data previously stored on an EVP_PKEY.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

Stored pointer, or NULL if unset or on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key to query.
| *idx*
| Index previously used with EVP_PKEY_set_ex_data().
|===


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