[#EVP_PKEY_CTX_set_app_data]
= EVP_PKEY_CTX_set_app_data
:mrdocs:

Store an opaque application pointer on a key context.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_PKEY_CTX_set_app_data(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    void* data);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context to update.
| *data*
| Caller‐owned pointer retrieved later with EVP_PKEY_CTX_get_app_data().
|===


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