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* @file MFKDF Stack Factor Derivation
* @copyright Multifactor, Inc. 2022–2025
*
* @description
* Derive key stacking factor for multi-factor key derivation
*
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
*/
const deriveKey = require('../key').key
/**
* Derive an MFKDF stacked key factor
*
* @example
* // setup key with stack factor
* const setup = await mfkdf.setup.key([
* await mfkdf.setup.factors.stack([
* await mfkdf.setup.factors.password('password1', {
* id: 'password1'
* }),
* await mfkdf.setup.factors.password('password2', {
* id: 'password2'
* })
* ]),
* await mfkdf.setup.factors.password('password3', { id: 'password3' })
* ])
*
* // derive key with stack factor
* const derive = await mfkdf.derive.key(setup.policy, {
* stack: mfkdf.derive.factors.stack({
* password1: mfkdf.derive.factors.password('password1'),
* password2: mfkdf.derive.factors.password('password2')
* }),
* password3: mfkdf.derive.factors.password('password3')
* })
*
* setup.key.toString('hex') // -> 01d0…2516
* derive.key.toString('hex') // -> 01d0…2516
*
* @param {Object.<string, MFKDFFactor>} factors - Factors used to derive this key
* @returns {function(config:Object): Promise<MFKDFFactor>} Async function to generate MFKDF factor information
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
* @since 0.15.0
* @memberof derive.factors
*/
function stack (factors) {
return async (params) => {
const key = await deriveKey(params, factors, false, true)
return {
type: 'stack',
data: key.key,
params: async () => {
return key.policy
},
output: async () => {
return key
}
}
}
}
module.exports.stack = stack
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