[#EVP_PKEY_derive_init]
= EVP_PKEY_derive_init
:mrdocs:

Initialize a key context for shared‐secret derivation (key exchange).

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

1 on success, or 0 / a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context created for a key‐exchange algorithm.
|===


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