Lighter, leaner, meaner and faster.

libfes-lite is a library for solving systems of quadratic boolean equations by exhaustive search. It runs in time exponential in the number of variables, but the constant is very low.

Some care has been put into checking that libfes-lite produces corrects results, and there is a somewhat extensive test suite. However, it comes WITHOUT WARRANTY OF ANY KIND, and in particular, without the garantee that it finds correct solutions in all cases.

Building requires cmake. Building out-of-source is recommended

• mkdir build
• cd build
• cmake ..
• make
• (run the test suite) make check

The benchmark/ folder contains code that exercices the library. If you just want to solve quadratic boolean systems, then use:

• benchmark/demo.c : full-blown program that solves a larger system of quadratic equations using all available cores Example:

# ./demo < examples/random_40_quad.in

If you want to understand how the whole thing works, and/or benchmark stuff, take a look at :

• benchmark/correct_use.c : demonstrates how to use the library
• benchmark/speed.c : benchmarks all available kernels

This code parses polynomial systems modulo 2 in the following format:

• Lines begining by a # are ignored.
• Spaces, tabs, etc. are ignored.
• The first non-comment line contains the names of all variables, separated by commas. This implicitly numbers them. The first variable has number 0.
• Each subsequent lines describe a polynomial.
• A polynomial is a sum of monomials, separated by +
• A monomial is either 0, 1, a single variable, or a product of several variables separated by *.

(It follows that an empty line denote the zero polynomial).