[#EVP_PKEY_CTX_set_dh_nid]
= EVP_PKEY_CTX_set_dh_nid
:mrdocs:

Select named Diffie‐Hellman parameters (RFC 7919 / RFC 3526) by NID.

== Synopsis

Declared in `<openssl/dh.h>`

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

== Description

Mutually exclusive with EVP_PKEY_CTX_set_dh_rfc5114() / set_dhx_rfc5114().

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| EVP_PKEY_CTX used for DH parameter or key generation.
| *nid*
| Named group such as NID_ffdhe2048 or NID_modp_2048, or NID_undef to clear.
|===


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