[#EVP_PKEY_auth_decapsulate_init]
= EVP_PKEY_auth_decapsulate_init
:mrdocs:

Initialize authenticated decapsulation on `ctx` using an authentication public key.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context for a KEM / encapsulate‐capable algorithm.
| *authpub*
| Authentication public key used by the authenticated decapsulation operation.
| *params*
| Optional OSSL_PARAM array of algorithm parameters, or NULL.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#