How to Share a Secret

From Adi Shamir's How to Share a Secret, referenced from his paper and the Wikipedia entry, using finite field arithmetic.

Usage Guide

1. No npm install necessary! All in native JS!
2. Modify test.js values S, N, and P (if you dare) with desired values.
3. Run node test.js, and it will reconstruct your secret!
4. Most importantly: have fun. I sure did!

Limitations

1. N (or K) has an unspecified limit. Anything above will be insufficient to return the secret.