/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0 /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad = '' /* base-64 pad character. "=" for strict RFC compliance   */
var chrsz = 8 /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
export function hex_md5(s) {
  return binl2hex(core_md5(str2binl(s), s.length * chrsz))
}

export function b64_md5(s) {
  return binl2b64(core_md5(str2binl(s), s.length * chrsz))
}

export function str_md5(s) {
  return binl2str(core_md5(str2binl(s), s.length * chrsz))
}

export function hex_hmac_md5(key, data) {
  return binl2hex(core_hmac_md5(key, data))
}

export function b64_hmac_md5(key, data) {
  return binl2b64(core_hmac_md5(key, data))
}

export function str_hmac_md5(key, data) {
  return binl2str(core_hmac_md5(key, data))
}

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test() {
  return hex_md5('abc') == '900150983cd24fb0d6963f7d28e17f72'
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len) {
  /* append padding */
  x[len >> 5] |= 0x80 << len % 32
  x[(((len + 64) >>> 9) << 4) + 14] = len

  var a = 1732584193
  var b = -271733879
  var c = -1732584194
  var d = 271733878

  for (var i = 0; i < x.length; i += 16) {
    var olda = a
    var oldb = b
    var oldc = c
    var oldd = d

    a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936)
    d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
    c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
    b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
    a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
    d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
    c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
    b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
    a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
    d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
    c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
    b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
    a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
    d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
    c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
    b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)

    a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
    d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
    c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
    b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302)
    a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
    d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
    c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
    b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
    a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
    d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
    c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
    b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
    a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
    d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
    c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
    b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)

    a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
    d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
    c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
    b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
    a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
    d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
    c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
    b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
    a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
    d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222)
    c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
    b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
    a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
    d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
    c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
    b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)

    a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844)
    d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
    c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
    b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
    a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
    d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
    c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
    b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
    a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
    d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
    c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
    b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
    a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
    d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
    c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
    b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)

    a = safe_add(a, olda)
    b = safe_add(b, oldb)
    c = safe_add(c, oldc)
    d = safe_add(d, oldd)
  }
  return Array(a, b, c, d)
}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t) {
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}

function md5_ff(a, b, c, d, x, s, t) {
  return md5_cmn((b & c) | (~b & d), a, b, x, s, t)
}

function md5_gg(a, b, c, d, x, s, t) {
  return md5_cmn((b & d) | (c & ~d), a, b, x, s, t)
}

function md5_hh(a, b, c, d, x, s, t) {
  return md5_cmn(b ^ c ^ d, a, b, x, s, t)
}

function md5_ii(a, b, c, d, x, s, t) {
  return md5_cmn(c ^ (b | ~d), a, b, x, s, t)
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data) {
  var bkey = str2binl(key)
  if (bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz)

  var ipad = Array(16),
    opad = Array(16)
  for (var i = 0; i < 16; i++) {
    ipad[i] = bkey[i] ^ 0x36363636
    opad[i] = bkey[i] ^ 0x5c5c5c5c
  }

  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz)
  return core_md5(opad.concat(hash), 512 + 128)
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y) {
  var lsw = (x & 0xffff) + (y & 0xffff)
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
  return (msw << 16) | (lsw & 0xffff)
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt))
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str) {
  var bin = Array()
  var mask = (1 << chrsz) - 1
  for (var i = 0; i < str.length * chrsz; i += chrsz) bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << i % 32
  return bin
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin) {
  var str = ''
  var mask = (1 << chrsz) - 1
  for (var i = 0; i < bin.length * 32; i += chrsz) str += String.fromCharCode((bin[i >> 5] >>> i % 32) & mask)
  return str
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray) {
  var hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef'
  var str = ''
  for (var i = 0; i < binarray.length * 4; i++) {
    str +=
      hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xf) +
      hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xf)
  }
  return str
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray) {
  var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  var str = ''
  for (var i = 0; i < binarray.length * 4; i += 3) {
    var triplet =
      (((binarray[i >> 2] >> (8 * (i % 4))) & 0xff) << 16) |
      (((binarray[(i + 1) >> 2] >> (8 * ((i + 1) % 4))) & 0xff) << 8) |
      ((binarray[(i + 2) >> 2] >> (8 * ((i + 2) % 4))) & 0xff)
    for (var j = 0; j < 4; j++) {
      if (i * 8 + j * 6 > binarray.length * 32) str += b64pad
      else str += tab.charAt((triplet >> (6 * (3 - j))) & 0x3f)
    }
  }
  return str
}