[#OSSL_HPKE_CTX_set1_ikme]
= OSSL_HPKE_CTX_set1_ikme
:mrdocs:

Override the sender's ephemeral IKM used inside OSSL_HPKE_encap() (deterministic).

== Synopsis

Declared in `<openssl/hpke.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_HPKE_CTX_set1_ikme(
    xref:OSSL_HPKE_CTX.adoc[OSSL_HPKE_CTX]* ctx,
    unsigned char const* ikme,
    size_t ikmelen);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Sender HPKE context (optional; call before OSSL_HPKE_encap()).
| *ikme*
| Input key material for deterministic ephemeral key generation.
| *ikmelen*
| Length of `ikme;` should be >= OSSL_HPKE_get_recommended_ikmelen().
|===


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