/// <summary>
/// When overridden in a derived class, routes data written to the object into the hash algorithm for computing the hash.
/// </summary>
/// <param name="array">The input to compute the hash code for.</param>
/// <param name="offset">The offset into the byte array from which to begin using data.</param>
/// <param name="length">The number of bytes in the byte array to use as data.</param>
internal override void HashCoreImplement(byte[] array, int offset, int length)
{
uint crc = Paramter.RefOutput ? CrcHashAlgorithmHelper.ReverseBits(Paramter.RemainderInitialValue, Paramter.Width) : Paramter.RemainderInitialValue;
if (Paramter.RefOutput)
{
for (int i = offset; i < offset + length; i++)
{
crc = (Table[(crc ^ array[i]) & 0xFF] ^ (crc >> 8));
crc &= Mask;
}
}
else
{
int toRight = (HashSize - 8);
toRight = toRight < 0 ? 0 : toRight;
for (int i = offset; i < offset + length; i++)
{
crc = (Table[((crc >> toRight) ^ array[i]) & 0xFF] ^ (crc << 8));
crc &= Mask;
}
}
FinalValue = crc;
}
/// <summary> /// Generates the specified paramter. /// </summary> /// <param name="paramter">The paramter.</param> /// <returns></returns> internal override uint[] Generate(CrcParamter <uint> paramter) => CrcHashAlgorithmHelper.GenerateTable(paramter.Polynomial, paramter.Width, paramter.RefInput, Mask);
/// <summary> /// When overridden in a derived class, finalizes the hash computation after the last data is processed by the cryptographic stream object. /// </summary> /// <returns> /// The computed hash code. /// </returns> protected override byte[] HashFinal() => CrcHashAlgorithmHelper.ToBigEndianBytes(FinalValue ^ Paramter.XorResultValue);
