# MATH_CalcChecksum*

## C Specification

      #include <nitro/math/checksum.h>

      u8  MATH_CalcChecksum8( const void* data, u32 dataLength );
      u16 MATH_CalcChecksum16( const void* data, u32 dataLength );

## Arguments

data | Pointer to the input data
dataLength | Size of the input data

## Return Values

Various checksum values

## Description

Computes both the 8-bit Checksum and 16-bit Checksum in one call. Any size and alignment position can be used for the input data. 8-bit Checksum is an algorithm to find the 8-bit hash value. It computes the one's complement of the one's complement sum in 8-bit units. 16-bit Checksum is an algorithm to find the 16-bit hash value. It computes the one's complement of the one's complement sum in 16-bit units. 16-bit Checksum returns the same value as IP Checksum or Internet Checksum, which are used with IP, UDP and TCP protocols. For details on Internet Checksum, see RFC (Request For Comments) 1071, which is published by IETF (The Internet Engineering Task Force).

## See Also

`MATH_Checksum*Init`, `MATH_Checksum*Update`, `MATH_Checksum*GetHash`

## Revision History

04/12/2005 Initial version.

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