[#EVP_PKEY_encapsulate]
= EVP_PKEY_encapsulate
:mrdocs:

Perform key encapsulation: produce a wrapped key and a shared secret.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_encapsulate(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char* wrappedkey,
    size_t* wrappedkeylen,
    unsigned char* genkey,
    size_t* genkeylen);
----

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Context previously initialized with EVP_PKEY_encapsulate_init().
| *wrappedkey*
| Buffer receiving the encapsulated key, or NULL to query lengths.
| *wrappedkeylen*
| In/out length of `wrappedkey.`
| *genkey*
| Buffer receiving the generated shared secret, or NULL to query lengths.
| *genkeylen*
| In/out length of `genkey.`
|===


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