[#EVP_PKEY_get_group_name]
= EVP_PKEY_get_group_name
:mrdocs:

Copy the elliptic‐curve or DH group name from a key into a caller buffer.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_group_name(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey,
    char* name,
    size_t name_sz,
    size_t* gname_len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key whose group / curve name is queried.
| *name*
| Optional destination buffer for the NUL‐terminated name, or NULL to query length only.
| *name_sz*
| Size of `name` in bytes.
| *gname_len*
| Optional destination for the name length excluding NUL, or NULL.
|===


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