[#EVP_MD_meth_set_copy]
= EVP_MD_meth_set_copy
:mrdocs:

Set the context‐copy 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_copy(
    xref:EVP_MD.adoc[EVP_MD]* md,
    int(* copy)(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]*, xref:EVP_MD_CTX.adoc[EVP_MD_CTX] const*));
----

[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 error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *md*
| Digest method being constructed with EVP_MD_meth_new().
| *copy*
| Callback that duplicates digest state from `from` into `to.`
|===


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