[#DES_cbc_cksum]
= DES_cbc_cksum
:mrdocs:

Compute a DES CBC checksum of `input` and return the last DES_LONG of the MAC (deprecated).

== Synopsis

Declared in `<openssl/des.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:DES_LONG.adoc[DES_LONG]
DES_cbc_cksum(
    unsigned char const* input,
    xref:DES_cblock.adoc[DES_cblock]* output,
    long length,
    xref:DES_key_schedule.adoc[DES_key_schedule]* schedule,
    xref:const_DES_cblock.adoc[const_DES_cblock]* ivec);
----

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

Last DES_LONG of the checksum value.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| Input bytes of length `length.`
| *output*
| Optional destination for the full 8‐byte checksum, or NULL.
| *length*
| Number of input bytes to checksum.
| *schedule*
| Expanded DES key schedule.
| *ivec*
| Initial 8‐byte IV for the CBC MAC (not updated).
|===


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