You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
2.5 KiB
106 lines
2.5 KiB
var md5 = require('create-hash/md5')
|
|
var RIPEMD160 = require('ripemd160')
|
|
var sha = require('sha.js')
|
|
var Buffer = require('safe-buffer').Buffer
|
|
|
|
var checkParameters = require('./precondition')
|
|
var defaultEncoding = require('./default-encoding')
|
|
var toBuffer = require('./to-buffer')
|
|
|
|
var ZEROS = Buffer.alloc(128)
|
|
var sizes = {
|
|
md5: 16,
|
|
sha1: 20,
|
|
sha224: 28,
|
|
sha256: 32,
|
|
sha384: 48,
|
|
sha512: 64,
|
|
rmd160: 20,
|
|
ripemd160: 20
|
|
}
|
|
|
|
function Hmac (alg, key, saltLen) {
|
|
var hash = getDigest(alg)
|
|
var blocksize = (alg === 'sha512' || alg === 'sha384') ? 128 : 64
|
|
|
|
if (key.length > blocksize) {
|
|
key = hash(key)
|
|
} else if (key.length < blocksize) {
|
|
key = Buffer.concat([key, ZEROS], blocksize)
|
|
}
|
|
|
|
var ipad = Buffer.allocUnsafe(blocksize + sizes[alg])
|
|
var opad = Buffer.allocUnsafe(blocksize + sizes[alg])
|
|
for (var i = 0; i < blocksize; i++) {
|
|
ipad[i] = key[i] ^ 0x36
|
|
opad[i] = key[i] ^ 0x5C
|
|
}
|
|
|
|
var ipad1 = Buffer.allocUnsafe(blocksize + saltLen + 4)
|
|
ipad.copy(ipad1, 0, 0, blocksize)
|
|
this.ipad1 = ipad1
|
|
this.ipad2 = ipad
|
|
this.opad = opad
|
|
this.alg = alg
|
|
this.blocksize = blocksize
|
|
this.hash = hash
|
|
this.size = sizes[alg]
|
|
}
|
|
|
|
Hmac.prototype.run = function (data, ipad) {
|
|
data.copy(ipad, this.blocksize)
|
|
var h = this.hash(ipad)
|
|
h.copy(this.opad, this.blocksize)
|
|
return this.hash(this.opad)
|
|
}
|
|
|
|
function getDigest (alg) {
|
|
function shaFunc (data) {
|
|
return sha(alg).update(data).digest()
|
|
}
|
|
function rmd160Func (data) {
|
|
return new RIPEMD160().update(data).digest()
|
|
}
|
|
|
|
if (alg === 'rmd160' || alg === 'ripemd160') return rmd160Func
|
|
if (alg === 'md5') return md5
|
|
return shaFunc
|
|
}
|
|
|
|
function pbkdf2 (password, salt, iterations, keylen, digest) {
|
|
checkParameters(iterations, keylen)
|
|
password = toBuffer(password, defaultEncoding, 'Password')
|
|
salt = toBuffer(salt, defaultEncoding, 'Salt')
|
|
|
|
digest = digest || 'sha1'
|
|
|
|
var hmac = new Hmac(digest, password, salt.length)
|
|
|
|
var DK = Buffer.allocUnsafe(keylen)
|
|
var block1 = Buffer.allocUnsafe(salt.length + 4)
|
|
salt.copy(block1, 0, 0, salt.length)
|
|
|
|
var destPos = 0
|
|
var hLen = sizes[digest]
|
|
var l = Math.ceil(keylen / hLen)
|
|
|
|
for (var i = 1; i <= l; i++) {
|
|
block1.writeUInt32BE(i, salt.length)
|
|
|
|
var T = hmac.run(block1, hmac.ipad1)
|
|
var U = T
|
|
|
|
for (var j = 1; j < iterations; j++) {
|
|
U = hmac.run(U, hmac.ipad2)
|
|
for (var k = 0; k < hLen; k++) T[k] ^= U[k]
|
|
}
|
|
|
|
T.copy(DK, destPos)
|
|
destPos += hLen
|
|
}
|
|
|
|
return DK
|
|
}
|
|
|
|
module.exports = pbkdf2
|