[#OSSL_CALLBACK]
= OSSL&lowbar;CALLBACK
:mrdocs:

Generic provider&sol;libcrypto callback receiving an OSSL&lowbar;PARAM array&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int OSSL&lowbar;CALLBACK(xref:OSSL_PARAM.adoc[OSSL&lowbar;PARAM] const[], void*);
----

== Return Value

1 on success, or 0 on failure&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *params*
| Parameter array describing the event or request (may be empty)&period;
| *arg*
| Caller&hyphen;supplied opaque pointer&period;
|===


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