[#EC_GROUP_get_pentanomial_basis]
= EC_GROUP_get_pentanomial_basis
:mrdocs:

Return the pentanomial basis degrees k1, k2, k3 for a characteristic‐2 curve group.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EC_GROUP_get_pentanomial_basis(
    xref:EC_GROUP.adoc[EC_GROUP] const* group,
    unsigned int* k1,
    unsigned int* k2,
    unsigned int* k3);
----

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *group*
| EC_GROUP defined over GF(2ˆm) with a pentanomial field polynomial.
| *k1*
| Receives the lowest middle‐term degree of xˆm + xˆk3 + xˆk2 + xˆk1 + 1.
| *k2*
| Receives the middle middle‐term degree.
| *k3*
| Receives the highest middle‐term degree.
|===


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