var Buffer = require('safe-buffer').Buffer
|
|
var checkParameters = require('./precondition')
|
var defaultEncoding = require('./default-encoding')
|
var sync = require('./sync')
|
var toBuffer = require('./to-buffer')
|
|
var ZERO_BUF
|
var subtle = global.crypto && global.crypto.subtle
|
var toBrowser = {
|
sha: 'SHA-1',
|
'sha-1': 'SHA-1',
|
sha1: 'SHA-1',
|
sha256: 'SHA-256',
|
'sha-256': 'SHA-256',
|
sha384: 'SHA-384',
|
'sha-384': 'SHA-384',
|
'sha-512': 'SHA-512',
|
sha512: 'SHA-512'
|
}
|
var checks = []
|
function checkNative (algo) {
|
if (global.process && !global.process.browser) {
|
return Promise.resolve(false)
|
}
|
if (!subtle || !subtle.importKey || !subtle.deriveBits) {
|
return Promise.resolve(false)
|
}
|
if (checks[algo] !== undefined) {
|
return checks[algo]
|
}
|
ZERO_BUF = ZERO_BUF || Buffer.alloc(8)
|
var prom = browserPbkdf2(ZERO_BUF, ZERO_BUF, 10, 128, algo)
|
.then(function () {
|
return true
|
}).catch(function () {
|
return false
|
})
|
checks[algo] = prom
|
return prom
|
}
|
var nextTick
|
function getNextTick () {
|
if (nextTick) {
|
return nextTick
|
}
|
if (global.process && global.process.nextTick) {
|
nextTick = global.process.nextTick
|
} else if (global.queueMicrotask) {
|
nextTick = global.queueMicrotask
|
} else if (global.setImmediate) {
|
nextTick = global.setImmediate
|
} else {
|
nextTick = global.setTimeout
|
}
|
return nextTick
|
}
|
function browserPbkdf2 (password, salt, iterations, length, algo) {
|
return subtle.importKey(
|
'raw', password, { name: 'PBKDF2' }, false, ['deriveBits']
|
).then(function (key) {
|
return subtle.deriveBits({
|
name: 'PBKDF2',
|
salt: salt,
|
iterations: iterations,
|
hash: {
|
name: algo
|
}
|
}, key, length << 3)
|
}).then(function (res) {
|
return Buffer.from(res)
|
})
|
}
|
|
function resolvePromise (promise, callback) {
|
promise.then(function (out) {
|
getNextTick()(function () {
|
callback(null, out)
|
})
|
}, function (e) {
|
getNextTick()(function () {
|
callback(e)
|
})
|
})
|
}
|
module.exports = function (password, salt, iterations, keylen, digest, callback) {
|
if (typeof digest === 'function') {
|
callback = digest
|
digest = undefined
|
}
|
|
digest = digest || 'sha1'
|
var algo = toBrowser[digest.toLowerCase()]
|
|
if (!algo || typeof global.Promise !== 'function') {
|
getNextTick()(function () {
|
var out
|
try {
|
out = sync(password, salt, iterations, keylen, digest)
|
} catch (e) {
|
return callback(e)
|
}
|
callback(null, out)
|
})
|
return
|
}
|
|
checkParameters(iterations, keylen)
|
password = toBuffer(password, defaultEncoding, 'Password')
|
salt = toBuffer(salt, defaultEncoding, 'Salt')
|
if (typeof callback !== 'function') throw new Error('No callback provided to pbkdf2')
|
|
resolvePromise(checkNative(algo).then(function (resp) {
|
if (resp) return browserPbkdf2(password, salt, iterations, keylen, algo)
|
|
return sync(password, salt, iterations, keylen, digest)
|
}), callback)
|
}
|
