Interface CarryCRTStrategy

  • All Known Implementing Classes:
    StepCarryCRTStrategy

    public interface CarryCRTStrategy
    Interface for performing the final step of a three-modulus Number Theoretic Transform based convolution.
    Since:
    1.7.0
    Version:
    1.7.0
    Author:
    Mikko Tommila
    • Method Summary

      Modifier and Type Method Description
      DataStorage carryCRT​(DataStorage resultMod0, DataStorage resultMod1, DataStorage resultMod2, long resultSize)
      Calculate the final result of a three-NTT convolution.
    • Method Detail

      • carryCRT

        DataStorage carryCRT​(DataStorage resultMod0,
                             DataStorage resultMod1,
                             DataStorage resultMod2,
                             long resultSize)
                      throws ApfloatRuntimeException
        Calculate the final result of a three-NTT convolution.

        Performs a Chinese Remainder Theorem (CRT) on each element of the three result data sets to get the result of each element modulo the product of the three moduli. Then it calculates the carries to get the final result.

        Note that the return value's initial word may be zero or non-zero, depending on how large the result is.

        Assumes that MODULUS[0] > MODULUS[1] > MODULUS[2].

        Parameters:
        resultMod0 - The result modulo MODULUS[0].
        resultMod1 - The result modulo MODULUS[1].
        resultMod2 - The result modulo MODULUS[2].
        resultSize - The number of elements needed in the final result.
        Returns:
        The final result with the CRT performed and the carries calculated.
        Throws:
        ApfloatRuntimeException