[#MD4]
= MD4
:mrdocs:

Compute the MD4 digest of `n` bytes at `d` in one shot (deprecated&semi; prefer EVP&lowbar;Digest)&period;

== Synopsis

Declared in `&lt;openssl&sol;md4&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;deprecated&rsqb;&rsqb;
unsigned char*
MD4(
    unsigned char const* d,
    size&lowbar;t n,
    unsigned char* md);
----

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

Pointer to the digest bytes (`md,` or the static buffer when `md` is NULL)&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *d*
| Input message bytes&period;
| *n*
| Length of `d` in bytes&period;
| *md*
| Output buffer for the 16&hyphen;byte digest, or NULL to use a static buffer&period;
|===


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