Sha256: 17f6bb171b04734a7cb8639a8d6eb31c5d274d8c90fffbbcfa1b981f542f9207
Contents?: true
Size: 1.85 KB
Versions: 7
Compression:
Stored size: 1.85 KB
Contents
var createHmac = require('create-hmac')
var MAX_ALLOC = Math.pow(2, 30) - 1 // default in iojs
exports.pbkdf2 = pbkdf2
function pbkdf2 (password, salt, iterations, keylen, digest, callback) {
if (typeof digest === 'function') {
callback = digest
digest = undefined
}
if (typeof callback !== 'function') {
throw new Error('No callback provided to pbkdf2')
}
var result = pbkdf2Sync(password, salt, iterations, keylen, digest)
setTimeout(function () {
callback(undefined, result)
})
}
exports.pbkdf2Sync = pbkdf2Sync
function pbkdf2Sync (password, salt, iterations, keylen, digest) {
if (typeof iterations !== 'number') {
throw new TypeError('Iterations not a number')
}
if (iterations < 0) {
throw new TypeError('Bad iterations')
}
if (typeof keylen !== 'number') {
throw new TypeError('Key length not a number')
}
if (keylen < 0 || keylen > MAX_ALLOC) {
throw new TypeError('Bad key length')
}
digest = digest || 'sha1'
if (!Buffer.isBuffer(password)) password = new Buffer(password, 'binary')
if (!Buffer.isBuffer(salt)) salt = new Buffer(salt, 'binary')
var hLen
var l = 1
var DK = new Buffer(keylen)
var block1 = new Buffer(salt.length + 4)
salt.copy(block1, 0, 0, salt.length)
var r
var T
for (var i = 1; i <= l; i++) {
block1.writeUInt32BE(i, salt.length)
var U = createHmac(digest, password).update(block1).digest()
if (!hLen) {
hLen = U.length
T = new Buffer(hLen)
l = Math.ceil(keylen / hLen)
r = keylen - (l - 1) * hLen
}
U.copy(T, 0, 0, hLen)
for (var j = 1; j < iterations; j++) {
U = createHmac(digest, password).update(U).digest()
for (var k = 0; k < hLen; k++) {
T[k] ^= U[k]
}
}
var destPos = (i - 1) * hLen
var len = (i === l ? r : hLen)
T.copy(DK, destPos, 0, len)
}
return DK
}
Version data entries
7 entries across 7 versions & 2 rubygems