[#EVP_PKEY_meth_set_derive]
= EVP_PKEY_meth_set_derive
:mrdocs:

Install key‐derivation init/derive callbacks on a legacy EVP_PKEY_METHOD.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
EVP_PKEY_meth_set_derive(
    xref:EVP_PKEY_METHOD.adoc[EVP_PKEY_METHOD]* pmeth,
    int(* derive_init)(xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]*),
    int(* derive)(xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]*, unsigned char*, size_t*));
----

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

[cols="1,4"]
|===
| Name| Description
| *pmeth*
| Method table to update.
| *derive_init*
| Optional initializer invoked by EVP_PKEY_derive_init(), or NULL.
| *derive*
| Callback that writes the shared secret / derived key.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#