[#BN_clear]
= BN_clear
:mrdocs:

Set a BIGNUM to zero and scrub its limb storage.

== Synopsis

Declared in `<openssl/bn.h>`

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIGNUM to clear; may be NULL (no‐op).
|===


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