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* @file MFKDF Password Factor Derivation
* @copyright Multifactor, Inc. 2022–2025
*
* @description
* Derive password factor for multi-factor key derivation
*
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
*/
const zxcvbn = require('zxcvbn')
/**
* Derive an MFKDF password factor
*
* @example
* // setup key with password factor
* const setup = await mfkdf.setup.key([
* await mfkdf.setup.factors.password('password')
* ])
*
* // derive key with password factor
* const derive = await mfkdf.derive.key(setup.policy, {
* password: mfkdf.derive.factors.password('password')
* })
*
* setup.key.toString('hex') // -> 01d0…2516
* derive.key.toString('hex') // -> 01d0…2516
*
* @param {string} password - The password 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 0.9.0
* @memberof derive.factors
*/
function password (password) {
if (typeof password !== 'string') {
throw new TypeError('password must be a string')
}
if (password.length === 0) throw new RangeError('password cannot be empty')
const strength = zxcvbn(password)
return async () => {
return {
type: 'password',
data: Buffer.from(password, 'utf-8'),
params: async () => {
return {}
},
output: async () => {
return { strength }
}
}
}
}
module.exports.password = password
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