[#OSSL_HPKE_encap]
= OSSL_HPKE_encap
:mrdocs:

Encapsulate to a recipient public key and derive sender HPKE secrets.

== Synopsis

Declared in `<openssl/hpke.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_HPKE_encap(
    xref:OSSL_HPKE_CTX.adoc[OSSL_HPKE_CTX]* ctx,
    unsigned char* enc,
    size_t* enclen,
    unsigned char const* pub,
    size_t publen,
    unsigned char const* info,
    size_t infolen);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Sender HPKE context (only one successful call allowed per context).
| *enc*
| Destination for the encapsulated public value; on input *`enclen` is capacity.
| *enclen*
| In/out length of `enc` (updated with bytes written).
| *pub*
| Recipient public key octets for the suite's KEM.
| *publen*
| Length of `pub` in bytes.
| *info*
| Optional application info bound into key schedule, or NULL if `infolen` is 0.
| *infolen*
| Length of `info` in bytes (must not exceed OSSL_HPKE_MAX_INFOLEN).
|===


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