[#EVP_PKEY_encapsulate_init]
= EVP_PKEY_encapsulate_init
:mrdocs:

Initialize a key context for a key‐encapsulation (KEM) encapsulate operation.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_encapsulate_init(
    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*
| Context holding the recipient public key.
| *params*
| Optional OSSL_PARAM array terminated by OSSL_PARAM_END, or NULL.
|===


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