[#BN_is_one]
= BN&lowbar;is&lowbar;one
:mrdocs:

Test whether a BIGNUM equals one&period;

== Synopsis

Declared in `&lt;openssl&sol;bn&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN&lowbar;is&lowbar;one(xref:BIGNUM.adoc[BIGNUM] const* a);
----

== Return Value

1 if `a` has the value 1, or 0 otherwise&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIGNUM to test&period;
|===


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