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* @file MFKDF Question Factor Setup
* @copyright Multifactor, Inc. 2022–2025
*
* @description
* Setup question factor for multi-factor key derivation
*
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
*/
const defaults = require('../../defaults')
const zxcvbn = require('zxcvbn')
/**
* Setup an MFKDF Security Question factor
*
* @example
* // setup key with security question factor
* const setup = await mfkdf.setup.key([
* await mfkdf.setup.factors.question('Fido')
* ])
*
* // derive key with security question factor
* const derive = await mfkdf.derive.key(setup.policy, {
* question: mfkdf.derive.factors.question('Fido')
* })
*
* setup.key.toString('hex') // -> 01d0…2516
* derive.key.toString('hex') // -> 01d0…2516
*
* @param {string} answer - The answer from which to derive an MFKDF factor
* @param {Object} [options] - Configuration options
* @param {string} [options.question] - Security question corresponding to this factor
* @param {string} [options.id='question'] - Unique identifier for this factor
* @returns {MFKDFFactor} MFKDF factor information
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
* @since 1.0.0
* @async
* @memberof setup.factors
*/
async function question (answer, options) {
options = Object.assign(Object.assign({}, defaults.question), options)
if (typeof answer !== 'string') {
throw new TypeError('answer must be a string')
}
if (answer.length === 0) throw new RangeError('answer cannot be empty')
if (typeof options.id !== 'string') {
throw new TypeError('id must be a string')
}
if (options.id.length === 0) throw new RangeError('id cannot be empty')
if (typeof options.question === 'undefined') options.question = ''
if (typeof options.question !== 'string') {
throw new TypeError('question must be a string')
}
answer = answer
.toLowerCase()
.replace(/[^0-9a-z ]/gi, '')
.trim()
const strength = zxcvbn(answer)
return {
type: 'question',
id: options.id,
entropy: Math.log2(strength.guesses),
data: Buffer.from(answer),
params: async () => {
return { question: options.question }
},
output: async () => {
return { strength }
}
}
}
module.exports.question = question
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