[#EVP_MD_CTX_update_fn]
= EVP&lowbar;MD&lowbar;CTX&lowbar;update&lowbar;fn
:mrdocs:

Return the digest update function currently used by a digest context (deprecated)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;deprecated&rsqb;&rsqb;
int(*
EVP&lowbar;MD&lowbar;CTX&lowbar;update&lowbar;fn(xref:EVP_MD_CTX.adoc[EVP&lowbar;MD&lowbar;CTX]* ctx))(xref:EVP_MD_CTX.adoc[EVP&lowbar;MD&lowbar;CTX]*, void const*, size&lowbar;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&lowbar;DigestUpdate(), or NULL if unset&period;

== Parameters

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


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