... its own "big num" library named cint
- use AVL trees to organize information
- use Lanczos Block, a pure C iterative matrix eigenvalues finder algorithm
- use Pollard's Rho algorithm to answer under 64 bits
The Microsoft Windows executable is included in the zip, the readme.md gives you details.
Small and larger RSA numbers have been factored by the software, such as the 100 decimal digit number RSA-100.
The software factored the 321-bit RSA number relating to the "bank card case".