[#EC_GROUP_get_trinomial_basis]
= EC_GROUP_get_trinomial_basis
:mrdocs:

Return the trinomial basis degree k for a characteristic‐2 curve group.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EC_GROUP_get_trinomial_basis(
    xref:EC_GROUP.adoc[EC_GROUP] const* group,
    unsigned int* k);
----

== Return Value

1 on success, or 0 if `group` does not use a trinomial basis.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *group*
| EC_GROUP defined over GF(2ˆm) with a trinomial field polynomial.
| *k*
| Receives the middle term degree of xˆm + xˆk + 1.
|===


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