[#OSSL_INOUT_CALLBACK]
= OSSL_INOUT_CALLBACK
:mrdocs:

Callback that both consumes input parameters and may populate output parameters.

== Synopsis

Declared in `<openssl/core.h>`

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

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *in_params*
| Input parameter array from the caller.
| *out_params*
| Optional output parameter array to fill, or NULL.
| *arg*
| Caller‐supplied opaque pointer.
|===


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