[#BN_mod_word]
= BN_mod_word
:mrdocs:

Return `a` modulo word `w.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unsigned long
BN_mod_word(
    xref:BIGNUM.adoc[BIGNUM] const* a,
    unsigned long w);
----

== Return Value

Remainder in [0, w), or (BN_ULONG)‐1 on error.]

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Dividend.
| *w*
| Modulus word (must be non‐zero).
|===


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