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A flexible CRC implementation supporting most major algorithms. Also includes ability to support custom implementations.

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InvertedTomato.Crc

TLDR; How do I make it go?

// Create a new instance of Crc using the algorithm of your choice
var crc = CrcAlgorithm.CreateCrc16CcittFalse();

// Give it some bytes to chew on - you can call this multiple times if needed
crc.Append(Encoding.ASCII.GetBytes("Hurray for cake!"));

// Get the output - as a hex string, byte array or unsigned integer
Console.WriteLine(crc.ToHexString());

Introduction

CRC is an interesting standard. It's an interesting standard, because it isn't really a standard at all. It seems rather better to be considered an idea. Many people have taken that core idea of CRC and implemented it in many different ways. At the time of writing Wikipedia lists 61 different implementations. There are even tools available that support over 100 implementations.

Each of these implementations (or algorithms, as they're more commonly known) differ in the following ways:

  • They vary in the width, or the size of the outputted hash.
  • The use different underlying polynomials.
  • The algorithms are seeded with differing initial values.
  • Some reflect the input before processing it
  • Some reflect the output before returning it
  • Some apply a XOR to the output return it

(This is taken straight from the fantastic work of Ross N. Williams and I take no credit.)

InvertedTomato.Crc takes into account all of these parameters allowing it to be customised to the particular algorithm you need.

Supported algorithms

InvertedTomato.Crc allows you to plug any parameters you'd like into the constructor to support any algorithm you'd like (so long as it's width is 8-64bits), however I've included some of the most common algorithms for convenience borrowed from Meetantony.

Algorithm Generator
CRC-8 CrcAlgorithm.CreateCrc8()
CRC-8/CDMA2000 CrcAlgorithm.CreateCrc8Cdma2000()
CRC-8/DARC CrcAlgorithm.CreateCƒrc8Darc()
CRC-8/DVB-S2 CrcAlgorithm.CreateCrc8DvbS2()
CRC-8/EBU CrcAlgorithm.CreateCrc8Ebu()
CRC-8/I-CODE CrcAlgorithm.CreateCrc8ICode()
CRC-8/ITU CrcAlgorithm.CreateCrc8Itu()
CRC-8/MAXIM CrcAlgorithm.CreateCrc8Maxim()
CRC-8/ROHC CrcAlgorithm.CreateCrc8Rohc()
CRC-8/WCDMA CrcAlgorithm.CreateCrc8Wcdma()
CRC-16/CCITT-FALSE CrcAlgorithm.CreateCrc16CcittFalse()
CRC-16/ARC CrcAlgorithm.CreateCrc16Arc()
CRC-16/AUG-CCITT CrcAlgorithm.CreateCrc16AugCcitt()
CRC-16/BUYPASS CrcAlgorithm.CreateCrc16Buypass()
CRC-16/CDMA2000 CrcAlgorithm.CreateCrc16Cdma2000()
CRC-16/DDS-110 CrcAlgorithm.CreateCrc16Dds110()
CRC-16/DECT-R CrcAlgorithm.CreateCrc16DectR()
CRC-16/DECT-X CrcAlgorithm.CreateCrc16DectX()
CRC-16/DNP CrcAlgorithm.CreateCrc16Dnp()
CRC-16/EN-13757 CrcAlgorithm.CreateCrc16En13757()
CRC-16/GENIBUS CrcAlgorithm.CreateCrc16Genibus()
CRC-16/MAXIM CrcAlgorithm.CreateCrc16Maxim()
CRC-16/MCRF4XX CrcAlgorithm.CreateCrc16Mcrf4Xx()
CRC-16/RIELLO CrcAlgorithm.CreateCrc16Riello()
CRC-16/T10-DIF CrcAlgorithm.CreateCrc16T10Dif()
CRC-16/TELEDISK CrcAlgorithm.CreateCrc16Teledisk()
CRC-16/TMS37157 CrcAlgorithm.CreateCrc16Tms37157()
CRC-16/USB CrcAlgorithm.CreateCrc16Usb()
CRC-A CrcAlgorithm.CreateCrcA()
CRC-16/KERMIT CrcAlgorithm.CreateCrc16Kermit()
CRC-16/MODBUS CrcAlgorithm.CreateCrc16Modbus()
CRC-16/X-25 CrcAlgorithm.CreateCrc16X25()
CRC-16/XMODEM CrcAlgorithm.CreateCrc16Xmodem()
CRC-24 CrcAlgorithm.CreateCrc24()
CRC-24/FLEXRAY-A CrcAlgorithm.CreateCrc24FlexrayA()
CRC-24/FLEXRAY-B CrcAlgorithm.CreateCrc24FlexrayB()
CRC-32 CrcAlgorithm.CreateCrc32()
CRC-32/BZIP2 CrcAlgorithm.CreateCrc32Bzip2()
CRC-32C CrcAlgorithm.CreateCrc32C()
CRC-32D CrcAlgorithm.CreateCrc32D()
CRC-32/JAMCRC CrcAlgorithm.CreateCrc32Jamcrc()
CRC-32/MPEG-2 CrcAlgorithm.CreateCrc32Mpeg2()
CRC-32/POSIX CrcAlgorithm.CreateCrc32Posix()
CRC-32Q CrcAlgorithm.CreateCrc32Q()
CRC-32/XFER CrcAlgorithm.CreateCrc32Xfer()
CRC-40/GSM CrcAlgorithm.CreateCrc40Gsm()
CRC-64 CrcAlgorithm.CreateCrc64()
CRC-64/WE CrcAlgorithm.CreateCrc64We()
CRC-64/XZ CrcAlgorithm.CreateCrc64Xz()

Further reading

If you're keen to know more about CRC, I can't over-recommend Ross N. Williams's 'A Painless Guide ot CRC Error Detection Algorithms. I haven't been able to find the original URL of it though, so I've mirrored it here.

Where do I get it from?

You can find it on NuGet.

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