Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | 1x 314x 313x 312x 311x 310x 309x 308x 307x 158x 149x 910x 1x | /** * @file Secret Sharing * @copyright Multifactor, Inc. 2022–2025 * * @description * Divide a secret into shares using various methods * * @author Vivek Nair (https://nair.me) <[email protected]> */ const sss = require('./library') /** * K-of-N secret sharing. Uses direct secret sharing for K = 1, and Shamir's Secret Sharing for K > 1. * * @example * // share secret using 2-of-3 shares * const shares = mfkdf.secrets.share(Buffer.from('abcdefghijklmnopqrst'), 2, 3) // -> [Buffer, Buffer, Buffer] * * // recover secret using 2 shares * const secret = mfkdf.secrets.combine([shares[0], null, shares[2]], 2, 3) * secret.toString() // -> hello world * * // recover original 3 shares * const recover = mfkdf.secrets.recover([shares[0], null, shares[2]], 2, 3) // -> [Buffer, Buffer, Buffer] * * @param {Buffer} secret - The secret value to be shared * @param {number} k - The threshold of shares required to reconstruct the secret * @param {number} n - The number of shares to generate * @returns {Array.<Buffer>} An array of N shares as Buffers * @author Vivek Nair (https://nair.me) <[email protected]> * @since 0.8.0 * @memberOf secrets */ function share (secret, k, n) { if (!Buffer.isBuffer(secret)) throw new TypeError('secret must be a buffer') if (secret.length === 0) throw new RangeError('secret must not be empty') if (!Number.isInteger(n)) throw new TypeError('n must be an integer') if (!(n > 0)) throw new RangeError('n must be positive') if (!Number.isInteger(k)) throw new TypeError('k must be an integer') if (!(k > 0)) throw new RangeError('k must be positive') if (k > n) throw new RangeError('k must be less than or equal to n') if (k === 1) { // 1-of-n return Array(n).fill(secret) } else { // k-of-n const shares = sss.split(new Uint8Array(secret), n, k) return shares.map((share) => Buffer.from(share)) } } module.exports.share = share |