[#CRYPTO_secure_actual_size]
= CRYPTO&lowbar;secure&lowbar;actual&lowbar;size
:mrdocs:

Return the actual secure&hyphen;heap block size reserved for `ptr&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;actual&lowbar;size(void* ptr);
----

== Return Value

Usable size of the secure block, or 0 if `ptr` is not secure&hyphen;allocated&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ptr*
| Secure allocation from CRYPTO&lowbar;secure&lowbar;malloc()&period;
|===


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