[#EVP_PKEY_CTX_set0_dh_kdf_ukm]
= EVP_PKEY_CTX_set0_dh_kdf_ukm
:mrdocs:

Set the DH KDF User Keying Material, transferring ownership of `ukm.`

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set0_dh_kdf_ukm(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char* ukm,
    int len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key‐exchange context configured for DH KDF.
| *ukm*
| UKM bytes that `ctx` will own and free; may be NULL when `len` is 0.
| *len*
| Length of `ukm` in bytes.
|===


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