[#EVP_MD_meth_set_ctrl]
= EVP_MD_meth_set_ctrl
:mrdocs:

Set the ctrl callback on a custom EVP_MD method (deprecated).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
EVP_MD_meth_set_ctrl(
    xref:EVP_MD.adoc[EVP_MD]* md,
    int(* ctrl)(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]*, int, int, void*));
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *md*
| Digest method being constructed.
| *ctrl*
| Callback handling EVP_MD_CTRL_* commands for digest contexts.
|===


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