[#BN_GF2m_mod_exp]
= BN_GF2m_mod_exp
:mrdocs:

Compute r = (a ˆ b) mod p for binary polynomial‐field (GF(2ˆm)) values.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_GF2m_mod_exp(
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BIGNUM.adoc[BIGNUM] const* a,
    xref:BIGNUM.adoc[BIGNUM] const* b,
    xref:BIGNUM.adoc[BIGNUM] const* p,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *r*
| Result BIGNUM.
| *a*
| Base.
| *b*
| Exponent.
| *p*
| Irreducible field polynomial.
| *ctx*
| BN_CTX scratch space.
|===


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