[#BN_sub_word]
= BN_sub_word
:mrdocs:

Subtract word `w` from BIGNUM `a` in place: a := a ‐ w.

== Synopsis

Declared in `<openssl/bn.h>`

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

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Value to update.
| *w*
| Word to subtract.
|===


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