[#OPENSSL_cleanse]
= OPENSSL&lowbar;cleanse
:mrdocs:

Overwrite `len` bytes at `ptr` with zeros in a way that resists compiler elision&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
OPENSSL&lowbar;cleanse(
    void* ptr,
    size&lowbar;t len);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ptr*
| Buffer to scrub (may be NULL when `len` is 0)&period;
| *len*
| Number of bytes to clear&period;
|===


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