[#ENGINE_load_private_key]
= ENGINE_load_private_key
:mrdocs:

Load a private key from an ENGINE by key identifier (deprecated).

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:EVP_PKEY.adoc[EVP_PKEY]*
ENGINE_load_private_key(
    xref:ENGINE.adoc[ENGINE]* e,
    char const* key_id,
    xref:UI_METHOD.adoc[UI_METHOD]* ui_method,
    void* callback_data);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Loaded EVP_PKEY, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Initialised ENGINE that implements key loading.
| *key_id*
| ENGINE‐specific key identifier string.
| *ui_method*
| UI method for PIN/passphrase prompts, or NULL.
| *callback_data*
| Application pointer passed to `ui_method.`
|===


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