Table of Contents

Class CyclicRedundancyCheck

Namespace
Cuemon.Security
Assembly
Cuemon.Core.dll

Represents the base class from which all implementations of the CRC (Cyclic Redundancy Check) checksum algorithm must derive.

public abstract class CyclicRedundancyCheck : Hash<CyclicRedundancyCheckOptions>, IHash, IConfigurable<CyclicRedundancyCheckOptions>
Inheritance
CyclicRedundancyCheck
Implements
Derived
Inherited Members

Remarks

Help and inspiration was gathered @ http://www.ross.net/crc/download/crc_v3.txt

Constructors

CyclicRedundancyCheck(UInt64, UInt64, UInt64, Action<CyclicRedundancyCheckOptions>)

Initializes a new instance of the CyclicRedundancyCheck class.

protected CyclicRedundancyCheck(ulong polynomial, ulong initialValue, ulong finalXor, Action<CyclicRedundancyCheckOptions> setup)

Parameters

polynomial UInt64

This is a binary value that should be specified as a hexadecimal number.

initialValue UInt64

This parameter specifies the initial value of the register when the algorithm starts.

finalXor UInt64

This is an W-bit value that should be specified as a hexadecimal number.

setup Action<CyclicRedundancyCheckOptions>

The CyclicRedundancyCheckOptions which need to be configured.

Properties

FinalXor

Gets the CRC final value that is XORed to the final register value.

public ulong FinalXor { get; }

Property Value

UInt64

The CRC final value that is XORed to the final register value.

InitialValue

Gets the CRC initial value of the register.

public ulong InitialValue { get; }

Property Value

UInt64

The CRC initial value of the register.

LookupTable

Gets the lookup table containing the pre-computed polynomial values.

protected ulong[] LookupTable { get; }

Property Value

UInt64[]

The lookup table containing the pre-computed polynomial values.

Methods

PolynomialIndexInitializer(Byte)

Returns the initial value for the specified index of the polynomial LookupTable.

protected abstract ulong PolynomialIndexInitializer(byte index)

Parameters

index Byte

The index of the array of polynomial values ranging from 0 to 255.

Returns

UInt64

The initial value for the specified index.

PolynomialSlotCalculator(ref UInt64, UInt64)

Computes the polynomial checksum value in steps of 8 (0-7) x 256 (0-255) giving a total of 2048 times.

protected abstract void PolynomialSlotCalculator(ref ulong checksum, ulong polynomial)

Parameters

checksum UInt64

The checksum that is iterated 8 times (0-7) in 256 steps (0-255).

polynomial UInt64

The polynomial value.

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