LibTomCrypt

Allows selective enabling or disabling of algorithms via tomcrypt_custom.h, enabling optimization for size or functionality as noted in the README's configuration options.

Provides dedicated makefiles for UNIX, Windows (MinGW/MSVC), and embedded systems, ensuring portability across diverse environments as highlighted in the build system section.

Supports multiple big integer libraries like GMP, libtommath, and tomsfastmath, selectable at runtime or compile-time for performance tuning, with examples in the building instructions.

Includes built-in test binaries for algorithm validation and timing measurements, aiding development and debugging, as mentioned in the make targets like 'test' and 'timing'.