[#BN_clear_free]
= BN&lowbar;clear&lowbar;free
:mrdocs:

Clear sensitive digits of a BIGNUM and free it&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
BN&lowbar;clear&lowbar;free(xref:BIGNUM.adoc[BIGNUM]* a);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIGNUM to wipe and free, or NULL&period;
|===


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