[#OPENSSL_cleanse]
= OPENSSL_cleanse
:mrdocs:

Overwrite `len` bytes at `ptr` with zeros in a way that resists compiler elision.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
OPENSSL_cleanse(
    void* ptr,
    size_t len);
----

== Parameters

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


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