[#EVP_PKEY_CTX_set_dhx_rfc5114]
= EVP_PKEY_CTX_set_dhx_rfc5114
:mrdocs:

Select an RFC 5114 DHX (X9.42 DH) named parameter set on a keygen/paramgen context.

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set_dhx_rfc5114(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    int gen);
----

== Return Value

1 on success, or a non‐positive value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| EVP_PKEY_CTX for a DHX operation.
| *gen*
| RFC 5114 parameter‐set index (1, 2, or 3).
|===


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