[#BN_GF2m_mod_inv]
= BN_GF2m_mod_inv
:mrdocs:

Compute the multiplicative inverse in GF(2ˆm): r = (1 / b) mod p.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_GF2m_mod_inv(
    xref:BIGNUM.adoc[BIGNUM]* r,
    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*
| Destination inverse.
| *b*
| Value to invert (must be non‐zero modulo `p).`
| *p*
| Irreducible modulus polynomial.
| *ctx*
| BN_CTX scratch space.
|===


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