[#OSSL_HPKE_export]
= OSSL_HPKE_export
:mrdocs:

Derive an exporter secret from an established HPKE context (after encap/decap).

== Synopsis

Declared in `<openssl/hpke.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_HPKE_export(
    xref:OSSL_HPKE_CTX.adoc[OSSL_HPKE_CTX]* ctx,
    unsigned char* secret,
    size_t secretlen,
    unsigned char const* label,
    size_t labellen);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| HPKE context with derived secrets.
| *secret*
| Destination buffer for the exported secret.
| *secretlen*
| Desired export length in bytes.
| *label*
| Application‐supplied exporter context label.
| *labellen*
| Length of `label` in bytes.
|===


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