[#EVP_PKEY_CTX_get0_ecdh_kdf_ukm]
= EVP_PKEY_CTX_get0_ecdh_kdf_ukm
:mrdocs:

Get a pointer to the ECDH KDF user keying material on a key context (deprecated).

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
EVP_PKEY_CTX_get0_ecdh_kdf_ukm(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    unsigned char** ukm);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Length of the UKM in bytes, or a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key‐exchange context configured for ECDH with a KDF.
| *ukm*
| Receives a pointer to the internal UKM bytes (do not free).
|===


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