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| 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 | 1x 19x 1x | /** * @file Multi-Factor Derived Key Crypto Functions * @copyright Multifactor, Inc. 2022–2025 * * @description * Cryptographic operations for a multi-factor derived key * * @author Vivek Nair (https://nair.me) <[email protected]> */ const { hkdfSync } = require('crypto') /** * Create a 256-bit sub-key for specified purpose using HKDF * * @example * // setup multi-factor derived key * const key = await mfkdf.setup.key([ await mfkdf.setup.factors.password('password') ]) * * // get sub-key for "eth" * const subkey = key.getSubkey('eth') * subkey.toString('hex') // -> 97cb…bac5 * * @param {string} [purpose=''] - Unique purpose value for this sub-key * @param {string} [salt=''] - Unique salt value for this sub-key * @returns {Buffer} Derived sub-key * @author Vivek Nair (https://nair.me) <[email protected]> * @since 0.10.0 * @memberOf MFKDFDerivedKey */ function getSubkey (purpose = '', salt = '') { return Buffer.from(hkdfSync('sha256', this.key, salt, purpose, 32)) } module.exports.getSubkey = getSubkey |