[#DES_is_weak_key]
= DES_is_weak_key
:mrdocs:

Test whether a DES key is one of the known weak or semi‐weak keys (deprecated).

== Synopsis

Declared in `<openssl/des.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DES_is_weak_key(xref:const_DES_cblock.adoc[const_DES_cblock]* key);
----

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

1 if `key` is weak or semi‐weak, or 0 otherwise.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Eight‐byte DES key to check.
|===


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