[#DH_KDF_X9_42]
= DH_KDF_X9_42
:mrdocs:

Derive keying material with the ANSI X9.42 / RFC 2631 KDF (deprecated).

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DH_KDF_X9_42(
    unsigned char* out,
    size_t outlen,
    unsigned char const* Z,
    size_t Zlen,
    xref:ASN1_OBJECT.adoc[ASN1_OBJECT]* key_oid,
    unsigned char const* ukm,
    size_t ukmlen,
    xref:EVP_MD.adoc[EVP_MD] const* md);
----

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

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Output buffer of `outlen` bytes receiving the derived key.
| *outlen*
| Desired derived‐key length.
| *Z*
| Shared secret bytes.
| *Zlen*
| Length of `Z.`
| *key_oid*
| Algorithm OID embedded in the OtherInfo structure.
| *ukm*
| Optional partyInfo/UKM bytes, or NULL.
| *ukmlen*
| Length of `ukm` when non‐NULL.
| *md*
| Message digest used by the KDF.
|===


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