Shamir's Secret Sharing

A JS/TS implementation of Shamir's Secret Sharing in a finite field GF(2^8).

Example

import { split, reconstruct } from "@tanle/shamirs-secret-sharing/sss-28";

// No limit the length of the secret as GF(2^8) works over each byte
const secretStr = "helloworld";
const secret = new Uint8Array(Buffer.from(secretStr, "utf-8"));

const threshold = 2; // must be in [0, 255]
const numShares = 2; // must be in [0, 255]
const shares = split(secret, threshold, numShares);

const reSecret = reconstruct(shares);

const reSecretStr = Buffer.from(reSecret).toString("utf-8");

console.log(secretStr, reSecretStr);

References

• Shamir's secret sharing
• Finite field arithmetic
• Hashicorp Vault implementation