[#DES_quad_cksum]
= DES&lowbar;quad&lowbar;cksum
:mrdocs:

Compute a DES&hyphen;based quadratic checksum over `input` (deprecated)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;deprecated&rsqb;&rsqb;
xref:DES_LONG.adoc[DES&lowbar;LONG]
DES&lowbar;quad&lowbar;cksum(
    unsigned char const* input,
    xref:DES_cblock.adoc[DES&lowbar;cblock] output[],
    long length,
    int out&lowbar;count,
    xref:DES_cblock.adoc[DES&lowbar;cblock]* seed);
----

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

Last DES&lowbar;LONG of the final checksum block&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| Input bytes of length `length&period;`
| *output*
| Array of DES&lowbar;cblock results&semi; may be NULL if only the return value is needed&period;
| *length*
| Number of input bytes to checksum&period;
| *out&lowbar;count*
| Number of 8&hyphen;byte checksum blocks to write to `output` (1&period;&period;4)&period;
| *seed*
| Seed block updated in place during the checksum&period;
|===


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