[#EVP_PKEY_derive_init_ex]
= EVP_PKEY_derive_init_ex
:mrdocs:

Initialize `ctx` for key derivation and apply optional algorithm parameters.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_derive_init_ex(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    xref:OSSL_PARAM.adoc[OSSL_PARAM] const params[]);
----

== Return Value

1 on success, or a non‐positive value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context created for a derivation‐capable algorithm.
| *params*
| Optional OSSL_PARAM array set on the context before return, or NULL.
|===


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