Package org.apfloat.spi

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 Details

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