The RSA.js program generates a RSA public and private key, writes the public key to 'public.txt' and shards the private key into k of n shares, taking k as an argument on the CLI, writing each shard to its respective Shard[k].txt file
Run npm install
Run the program using the command node ./RSA.js k where k is the number of shards.
To run the unit test, use npm run test, which runs the RSA.test.js file using Jest.
The RSA.test.js test file uses the generateKeys function in RSA.js to create an RSA key pair with the private key being broken into 5 shards. The public key along with the private key shards are all written into *.txt files located in a temporary directory that is later deleted. It then encrypts a random plain text, in this case 'testing', using the RSA public key. It goes on to reassemble the private key using shards 2 and 5 from the Shard[2].txt and Shard[5].txt files and uses that reassembled key to decrypt the encrypted 'testing' text back to plain text.