[#CRYPTO_set_ex_data]
= CRYPTO_set_ex_data
:mrdocs:

Store `val` at ex_data index `idx,` replacing any previous pointer.

== Synopsis

Declared in `<openssl/crypto.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ad*
| Ex‐data bag to update.
| *idx*
| Index from CRYPTO_get_ex_new_index() (or a class helper).
| *val*
| Pointer to store (may be NULL to clear the slot).
|===


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