[#EVP_PKEY_CTX_set_ec_paramgen_curve_nid]
= EVP_PKEY_CTX_set_ec_paramgen_curve_nid
:mrdocs:

Set the named curve NID used when generating EC parameters or keys.

== Synopsis

Declared in `<openssl/ec.h>`

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

== Return Value

1 on success, or a negative value on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| EVP_PKEY context for EC parameter or key generation.
| *nid*
| Curve NID such as NID_X9_62_prime256v1.
|===


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