feanor-math-hexl

A wrapper around the Intel Homomorphic Encryption Accelerator (HEXL) library that provides a fast implementation of power-of-two length negacyclic Number-Theoretic transforms (NTT).

The library builds on feanor-math, and exposes the base wrapper [hexl::HEXLNegacyclicNTT] and also the convolution algorithm [conv::HEXLConvolution] that uses it internally.

How to build

To use this library, you need an installation of HEXL. The buildscript will not attempt to download or build HEXL, thus you must ensure that the HEXL header files and a static library build are available. This library will search for these in a few standard locations (currently only /usr/local/include resp. /usr/local/lib), but the location can be overriden using environment variables.

• setting HEXL_DIR will result in feanor-math-hexl expecting the static library to be in HEXL_DIR/lib and the headers in HEXL_DIR/include
• setting HEXL_LIB_DIR and HEXL_INCLUDE_DIR will result in feanor-math-hexl expecting the static library to be in HEXL_LIB_DIR and the headers in HEXL_INCLUDE_DIR