[#EVP_PKEY_CTX_set0_ecdh_kdf_ukm]
= EVP_PKEY_CTX_set0_ecdh_kdf_ukm
:mrdocs:

Set the ECDH KDF user keying material, transferring ownership of `ukm.`

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set0_ecdh_kdf_ukm(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char* ukm,
    int len);
----

== Return Value

1 on success, or a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key‐exchange context configured for ECDH with a KDF.
| *ukm*
| Buffer of UKM bytes; ownership transfers to `ctx` (freed with the context).
| *len*
| Length of `ukm` in bytes.
|===


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