[#BN_nist_mod_func]
= BN_nist_mod_func
:mrdocs:

Return a fast modular‐reduction function for a known NIST prime.

== Synopsis

Declared in `<openssl/bn.h>`

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

== Return Value

Specialized mod function for `p,` or NULL if `p` is not a built‐in NIST prime.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p*
| Prime to look up (for example a BN_get0_nist_prime_* value).
|===


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