highctidh 1.0.2023112802

This is an unofficial fork of high-ctidh. This is highly experimental software and it has not yet been reviewed for security considerations.

This fork enhances high-ctidh with additional Makefile targets including building high-ctidh as four shared libraries, one for each key size of 511, 512, 1024, and 2048. Python bindings are additionally added, as well as optional Debian packaging of both the shared library object files and the Python module. The Python bindings were made in concert with the author of the highctidh ctidh_cgo Golang bindings. Both bindings were built around the same shared objects for cross verification purposes. Currently this library is fast on the x86_64 CPU architecture and functional but much slower with other CPU architectures. The portable backend was generated using the fiat-crypto project which uses a "Correct-by-Construction" approach; see PRIMES.md for more information. Tested architectures include: amd64, arm32/armv7l, arm64/aarch64, i386, loongarch64/Loongson, mips64/mips64el, POWER8/ppc64, POWER9/ppc64le, riscv64, s390x, sparc64, and x86_64 (with and without avx2). To see rough performance numbers, look at BENCHMARKS.md. We recommend using gcc 10 or later as the compiler except on arm32/armv7l, i386, and mips64/mips64el where we recommend clang 14.

The library has been tested on the following operating systems:

• Debian Bookworm (GNU libc)
• Alpine v.3.18 (musl libc)
• HardenedBSD (FreeBSD libc).

To build and install we recommend:

   sudo apt install gcc clang make
   make
   sudo make install

To build and install the shared library files using the "Correct-by-Construction" fiat-crypto portable C backend:

    make libhighctidh.so HIGHCTIDH_PORTABLE=1
    sudo make install

The fiat-crypto portable C backend works on all platforms.

To build and install the shared library files using the original artisanal x86_64 assembler backend:

    make libhighctidh.so HIGHCTIDH_PORTABLE=0
    sudo make install

The original artisanal assembler backend works only on the x86_64 platform. It has been modified slightly for compatibility with LLVM-as/clang. Hand written assembler contributions for other platforms are welcome.

By default HIGHCTIDH_PORTABLE=1 is enabled for all platforms unless the library is installed via the Python package, in which case optimized implementations will be used where possible.

To test without installing run the test target:

   make test

An example C program that can use any of the libhighctidh_{511,512,1024,2048}.so libraries is available in example-ctidh.c. Use the make examples target to build example-ctidh511, example-ctidh512, example-ctidh1024, and example-ctidh2048 programs.

A basic Python benchmarking program highctidh-simple-benchmark.py shows general performance numbers. Python tests may be run with pytest and should be functional without pytest assuming the library is installed. If the library path includes the build directory as is done in test.sh, pytest or python should be able to run the tests without installation.

More information about the Python bindings including installation instructions are available in the README.python.md file.

The original authors of this software released high-ctidh in the public domain. All contributions made in this fork are also in the public domain.

The original released README is README.original.md. The original website was https://ctidh.isogeny.org/software.html