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* @file MFKDF Question Factor Derivation
* @copyright Multifactor, Inc. 2022–2025
*
* @description
* Derive question factor for multi-factor key derivation
*
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
*/
const zxcvbn = require('zxcvbn')
/**
* Derive 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
* @returns {function(config:Object): Promise<MFKDFFactor>} Async function to generate MFKDF factor information
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
* @since 1.0.0
* @memberof derive.factors
*/
function question (answer) {
if (typeof answer !== 'string') {
throw new TypeError('answer must be a string')
}
if (answer.length === 0) throw new RangeError('answer cannot be empty')
answer = answer
.toLowerCase()
.replace(/[^0-9a-z ]/gi, '')
.trim()
const strength = zxcvbn(answer)
return async (params) => {
return {
type: 'question',
data: Buffer.from(answer),
params: async () => {
return params
},
output: async () => {
return { strength }
}
}
}
}
module.exports.question = question
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