[#DES_quad_cksum]
= DES_quad_cksum
:mrdocs:

Compute a DES‐based quadratic checksum over `input` (deprecated).

== Synopsis

Declared in `<openssl/des.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:DES_LONG.adoc[DES_LONG]
DES_quad_cksum(
    unsigned char const* input,
    xref:DES_cblock.adoc[DES_cblock] output[],
    long length,
    int out_count,
    xref:DES_cblock.adoc[DES_cblock]* seed);
----

[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 final checksum block.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| Input bytes of length `length.`
| *output*
| Array of DES_cblock results; may be NULL if only the return value is needed.
| *length*
| Number of input bytes to checksum.
| *out_count*
| Number of 8‐byte checksum blocks to write to `output` (1..4).
| *seed*
| Seed block updated in place during the checksum.
|===


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