[#ENGINE_LOAD_KEY_PTR]
= ENGINE_LOAD_KEY_PTR
:mrdocs:

Callback that loads a key from an ENGINE‐backed store.

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:EVP_PKEY.adoc[EVP_PKEY]*(* ENGINE_LOAD_KEY_PTR)(xref:ENGINE.adoc[ENGINE]*, char const*, xref:UI_METHOD.adoc[UI_METHOD]*, void*);
----

== Return Value

Newly allocated EVP_PKEY, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| ENGINE that owns the key material.
| *key_id*
| Identifier of the key within the ENGINE.
| *ui_method*
| UI method used to collect passphrases or a PIN, or NULL.
| *callback_data*
| Application data passed to `ui_method.`
|===


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