[#BN_swap]
= BN&lowbar;swap
:mrdocs:

Exchange the values of two BIGNUMs in constant time relative to their limb counts&period;

== Synopsis

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

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| First value&period;
| *b*
| Second value&period;
|===


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