[#EVP_MD_get_block_size]
= EVP&lowbar;MD&lowbar;get&lowbar;block&lowbar;size
:mrdocs:

Return the internal block size of a message digest in bytes&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP&lowbar;MD&lowbar;get&lowbar;block&lowbar;size(xref:EVP_MD.adoc[EVP&lowbar;MD] const* md);
----

== Return Value

Block size in bytes used by the compression function&period;

== Parameters

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


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