[#EVP_PKEY_export]
= EVP_PKEY_export
:mrdocs:

Export selected key parameters from an EVP_PKEY via a callback.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_export(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey,
    int selection,
    xref:OSSL_CALLBACK.adoc[OSSL_CALLBACK]* export_cb,
    void* export_cbarg);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Provider‐backed key to export.
| *selection*
| OSSL_KEYMGMT_SELECT_* mask describing which parts to export.
| *export_cb*
| Callback invoked with a temporary OSSL_PARAM array (not valid after return).
| *export_cbarg*
| Application argument passed to `export_cb.`
|===


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