[#EVP_PKEY_CTX_set_group_name]
= EVP_PKEY_CTX_set_group_name
:mrdocs:

Set the elliptic‐curve / DH group name on a key or parameter context.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context used for keygen/paramgen/derive.
| *name*
| Group name (for example "P‐256" or "ffdhe2048").
|===


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