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var DES = require('browserify-des')
var aes = require('browserify-aes/browser')
var aesModes = require('browserify-aes/modes')
var desModes = require('browserify-des/modes')
var ebtk = require('evp_bytestokey')

function createCipher (suite, password) {
  suite = suite.toLowerCase()

  var keyLen, ivLen
  if (aesModes[suite]) {
    keyLen = aesModes[suite].key
    ivLen = aesModes[suite].iv
  } else if (desModes[suite]) {
    keyLen = desModes[suite].key * 8
    ivLen = desModes[suite].iv
  } else {
    throw new TypeError('invalid suite type')
  }

  var keys = ebtk(password, false, keyLen, ivLen)
  return createCipheriv(suite, keys.key, keys.iv)
}

function createDecipher (suite, password) {
  suite = suite.toLowerCase()

  var keyLen, ivLen
  if (aesModes[suite]) {
    keyLen = aesModes[suite].key
    ivLen = aesModes[suite].iv
  } else if (desModes[suite]) {
    keyLen = desModes[suite].key * 8
    ivLen = desModes[suite].iv
  } else {
    throw new TypeError('invalid suite type')
  }

  var keys = ebtk(password, false, keyLen, ivLen)
  return createDecipheriv(suite, keys.key, keys.iv)
}

function createCipheriv (suite, key, iv) {
  suite = suite.toLowerCase()
  if (aesModes[suite]) return aes.createCipheriv(suite, key, iv)
  if (desModes[suite]) return new DES({ key: key, iv: iv, mode: suite })

  throw new TypeError('invalid suite type')
}

function createDecipheriv (suite, key, iv) {
  suite = suite.toLowerCase()
  if (aesModes[suite]) return aes.createDecipheriv(suite, key, iv)
  if (desModes[suite]) return new DES({ key: key, iv: iv, mode: suite, decrypt: true })

  throw new TypeError('invalid suite type')
}

function getCiphers () {
  return Object.keys(desModes).concat(aes.getCiphers())
}

exports.createCipher = exports.Cipher = createCipher
exports.createCipheriv = exports.Cipheriv = createCipheriv
exports.createDecipher = exports.Decipher = createDecipher
exports.createDecipheriv = exports.Decipheriv = createDecipheriv
exports.listCiphers = exports.getCiphers = getCiphers