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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | 1x 541x 541x 541x 923x 541x 541x 541x 541x 541x 541x 923x 923x 923x 923x 923x 923x 923x 923x 923x 923x 923x 923x 923x 923x 1x | const { createHash } = require('crypto')
/**
* Extracts the signable content from a policy object.
*
* @param {Object} [policy] - MFKDF policy object
* @returns {Buffer} The extracted data
* @since 2.0.0
* @async
*/
async function extract (policy) {
const hash = createHash('sha256')
hash.update(await extractPolicyCore(policy))
for (const factor of policy.factors) {
hash.update(await extractFactor(factor))
}
return hash.digest()
}
// Extracts the core signable content from a policy object.
async function extractPolicyCore (policy) {
const hash = createHash('sha256')
hash.update(policy.$id)
hash.update(policy.threshold.toString())
hash.update(policy.salt)
return hash.digest()
}
// Extracts the signable content from a factor object.
async function extractFactor (factor) {
const hash = createHash('sha256')
hash.update(await extractFactorCore(factor))
hash.update(await extractFactorParams(factor))
return hash.digest()
}
// Extracts the core signable content from a factor object.
async function extractFactorCore (factor) {
const hash = createHash('sha256')
hash.update(factor.id)
hash.update(factor.type)
hash.update(factor.pad)
hash.update(factor.salt)
hash.update(factor.secret)
return hash.digest()
}
// Extracts the signable content from a factor's params object.
async function extractFactorParams (factor) {
const hash = createHash('sha256')
hash.update(JSON.stringify(factor.params))
return hash.digest()
}
module.exports.extract = extract
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