[#BN_GF2m_poly2arr]
= BN_GF2m_poly2arr
:mrdocs:

Convert a GF(2ˆm) polynomial BIGNUM into a descending exponent index array.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_GF2m_poly2arr(
    xref:BIGNUM.adoc[BIGNUM] const* a,
    int p[],
    int max);
----

== Return Value

Number of exponents written (excluding ‐1), or 0 if `max` is too small / on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Polynomial whose set bits become exponents.
| *p*
| Destination array of size at least `max;` filled then terminated with ‐1.
| *max*
| Capacity of `p` including room for the ‐1 terminator.
|===


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