[#EVP_PKEY_derive_set_peer_ex]
= EVP_PKEY_derive_set_peer_ex
:mrdocs:

Set the peer public key for derivation, optionally validating it first.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Derivation context previously initialized with EVP_PKEY_derive_init() or _ex().
| *peer*
| Peer's public key used to compute the shared secret.
| *validate_peer*
| Non‐zero to run a public‐key check on `peer` before use, or 0 to skip.
|===


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