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* @file Stage
* @copyright Multifactor, Inc. 2022–2025
*
* @description
* Pre-compute MFKDF factors for benchmarking or performance
*
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
*/
/**
* Pre-compute an MFKDF factor setup process.
* Useful for benchmarking or parallelization where supported.
*
* @param {Promise<MFKDFFactor>} factor - An async MFKDF factor setup function promise
* @param {Buffer} [key] - MFKDF output key, needed to pre-compute factor params
* @returns {MFKDFFactor} An MFKDF factor whose outputs have been pre-computed
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
* @since 1.4.0
* @async
* @memberOf stage
*/
async function setup (factor, key) {
const result = await factor
if (key) {
const params = await result.params({ key })
result.params = () => Promise.resolve(params)
const output = await result.output()
result.output = () => Promise.resolve(output)
}
return result
}
/**
* Pre-compute an MFKDF factor derivation process.
* Useful for benchmarking or parallelization where supported.
*
* @param {function(config:Object): Promise<MFKDFFactor>} factor - An async MFKDF factor derivation function
* @param {Object} params - Factor parameters
* @param {Buffer} [key] - MFKDF output key, needed to pre-compute factor params
* @returns {function(config:Object): Promise<MFKDFFactor>} An async MFKDF factor derivation function whose outputs have been pre-computed
* @author Vivek Nair (https://nair.me) <vivek@nair.me>
* @since 1.4.0
* @async
* @memberOf stage
*/
async function derive (factor, params, key) {
const result = await factor(params)
if (key) {
const params = await result.params({ key })
result.params = () => Promise.resolve(params)
const output = await result.output()
result.output = () => Promise.resolve(output)
}
return () => Promise.resolve(result)
}
module.exports.factor = { setup, derive }
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