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/home/yanggyein/yanggyein/yang_home/node_modules/pbkdf2/lib/sync.js

var sizes = {
  md5: 16,
  sha1: 20,
  sha224: 28,
  sha256: 32,
  sha384: 48,
  sha512: 64,
  rmd160: 20,
  ripemd160: 20
}

var createHmac = require('create-hmac')
var Buffer = require('safe-buffer').Buffer

var checkParameters = require('./precondition')
var defaultEncoding = require('./default-encoding')
var toBuffer = require('./to-buffer')

function pbkdf2 (password, salt, iterations, keylen, digest) {
  checkParameters(iterations, keylen)
  password = toBuffer(password, defaultEncoding, 'Password')
  salt = toBuffer(salt, defaultEncoding, 'Salt')

digest = digest || 'sha1'

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 = createHmac(digest, password).update(block1).digest()
    var U = T

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]
    }

T.copy(DK, destPos)
    destPos += hLen
  }

return DK
}

module.exports = pbkdf2