[#CRYPTO_secure_used]
= CRYPTO&lowbar;secure&lowbar;used
:mrdocs:

Return how many bytes are currently allocated from the secure heap&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
CRYPTO&lowbar;secure&lowbar;used();
----

== Return Value

Total secure&hyphen;heap bytes in use, or 0 if the secure heap is not initialised&period;


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