[#EVP_MD_CTX_update_fn]
= EVP_MD_CTX_update_fn
:mrdocs:

Return the digest update function currently used by a digest context (deprecated).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int(*
EVP_MD_CTX_update_fn(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx))(xref:EVP_MD_CTX.adoc[EVP_MD_CTX]*, void const*, size_t);
----

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

Update callback invoked by EVP_DigestUpdate(), or NULL if unset.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context to query.
|===


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