[#EVP_PKEY_CTX_set_dh_rfc5114]
= EVP_PKEY_CTX_set_dh_rfc5114
:mrdocs:

Select RFC 5114 DH parameters (sections 2.1–2.3) on a DHX key context.

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_CTX_set_dh_rfc5114(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    int gen);
----

== Description

Mutually exclusive with EVP_PKEY_CTX_set_dh_nid().

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| EVP_PKEY_CTX with key type EVP_PKEY_DHX used for parameter generation.
| *gen*
| 1, 2, or 3 for RFC 5114 §2.1/§2.2/§2.3, or 0 to clear.
|===


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