[#EVP_PKEY_todata]
= EVP_PKEY_todata
:mrdocs:

Export selected key components from an EVP_PKEY as a newly allocated OSSL_PARAM array.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_todata(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey,
    int selection,
    xref:OSSL_PARAM.adoc[OSSL_PARAM]** params);
----

== 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.
| *params*
| Receives a newly allocated parameter array; free with OSSL_PARAM_free().
|===


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