const md4func = () => {

  const hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase    */
  const b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance  */
  const chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode   */

  const tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  const hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";

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

  /**
   * Bitwise rotate a 32-bit number to the left.
   */
  const rol = (num, cnt) => (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.
   */
  const str2binl = str => {
    const bin = Array();
    const mask = (1 << chrsz) - 1;
    for (let 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
   */
  const binl2str = bin => {
    let str = "";
    const mask = (1 << chrsz) - 1;
    for (let 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.
   */
  const binl2hex = binarray => {
    let str = "";
    for (let 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
   */
  const binl2b64 = binarray => {
    let str = "";
    for (let i = 0; i < binarray.length * 4; i += 3) {
      const 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 (let 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;
  };


  /**
   * Calculate the MD4 of an array of little-endian words, and a bit length
   */
  const core_md4 = (x, len) => {

    x[len >> 5] |= 0x80 << (len % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;
    let a = 1732584193;
    let b = -271733879;
    let c = -1732584194;
    let d = 271733878;

    for (let i = 0; i < x.length; i += 16) {

      const olda = a;
      const oldb = b;
      const oldc = c;
      const oldd = d;

      a = md4_ff(a, b, c, d, x[i], 3);
      d = md4_ff(d, a, b, c, x[i + 1], 7);
      c = md4_ff(c, d, a, b, x[i + 2], 11);
      b = md4_ff(b, c, d, a, x[i + 3], 19);
      a = md4_ff(a, b, c, d, x[i + 4], 3);
      d = md4_ff(d, a, b, c, x[i + 5], 7);
      c = md4_ff(c, d, a, b, x[i + 6], 11);
      b = md4_ff(b, c, d, a, x[i + 7], 19);
      a = md4_ff(a, b, c, d, x[i + 8], 3);
      d = md4_ff(d, a, b, c, x[i + 9], 7);
      c = md4_ff(c, d, a, b, x[i + 10], 11);
      b = md4_ff(b, c, d, a, x[i + 11], 19);
      a = md4_ff(a, b, c, d, x[i + 12], 3);
      d = md4_ff(d, a, b, c, x[i + 13], 7);
      c = md4_ff(c, d, a, b, x[i + 14], 11);
      b = md4_ff(b, c, d, a, x[i + 15], 19);

      a = md4_gg(a, b, c, d, x[i], 3);
      d = md4_gg(d, a, b, c, x[i + 4], 5);
      c = md4_gg(c, d, a, b, x[i + 8], 9);
      b = md4_gg(b, c, d, a, x[i + 12], 13);
      a = md4_gg(a, b, c, d, x[i + 1], 3);
      d = md4_gg(d, a, b, c, x[i + 5], 5);
      c = md4_gg(c, d, a, b, x[i + 9], 9);
      b = md4_gg(b, c, d, a, x[i + 13], 13);
      a = md4_gg(a, b, c, d, x[i + 2], 3);
      d = md4_gg(d, a, b, c, x[i + 6], 5);
      c = md4_gg(c, d, a, b, x[i + 10], 9);
      b = md4_gg(b, c, d, a, x[i + 14], 13);
      a = md4_gg(a, b, c, d, x[i + 3], 3);
      d = md4_gg(d, a, b, c, x[i + 7], 5);
      c = md4_gg(c, d, a, b, x[i + 11], 9);
      b = md4_gg(b, c, d, a, x[i + 15], 13);

      a = md4_hh(a, b, c, d, x[i], 3);
      d = md4_hh(d, a, b, c, x[i + 8], 9);
      c = md4_hh(c, d, a, b, x[i + 4], 11);
      b = md4_hh(b, c, d, a, x[i + 12], 15);
      a = md4_hh(a, b, c, d, x[i + 2], 3);
      d = md4_hh(d, a, b, c, x[i + 10], 9);
      c = md4_hh(c, d, a, b, x[i + 6], 11);
      b = md4_hh(b, c, d, a, x[i + 14], 15);
      a = md4_hh(a, b, c, d, x[i + 1], 3);
      d = md4_hh(d, a, b, c, x[i + 9], 9);
      c = md4_hh(c, d, a, b, x[i + 5], 11);
      b = md4_hh(b, c, d, a, x[i + 13], 15);
      a = md4_hh(a, b, c, d, x[i + 3], 3);
      d = md4_hh(d, a, b, c, x[i + 11], 9);
      c = md4_hh(c, d, a, b, x[i + 7], 11);
      b = md4_hh(b, c, d, a, x[i + 15], 15);

      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 basic operation for each round of the
   * algorithm.
   */
  const md4_cmn = (q, a, b, x, s, t) => safe_add(
      rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);

  const md4_ff = (a, b, c, d, x, s) => md4_cmn(
      (b & c) | ((~b) & d), a, 0, x, s, 0);

  const md4_gg = (a, b, c, d, x, s) => md4_cmn(
      (b & c) | (b & d) | (c & d), a, 0, x, s, 1518500249);

  const md4_hh = (a, b, c, d, x, s) => md4_cmn(
      b ^ c ^ d, a, 0, x, s, 1859775393);

  /**
   * Calculate the HMAC-MD4, of a key and some data
   */
  const core_hmac_md4 = (key, data) => {

    let bkey = str2binl(key);
    if (bkey.length > 16) {
      bkey = core_md4(bkey, key.length * chrsz)
    }

    const ipad = Array(16);
    const opad = Array(16);

    for (let i = 0; i < 16; i++) {
      ipad[i] = bkey[i] ^ 0x36363636;
      opad[i] = bkey[i] ^ 0x5C5C5C5C;
    }
    const hash = core_md4(
        ipad.concat(str2binl(data)), 512 + data.length * chrsz);

    return core_md4(opad.concat(hash), 512 + 128);
  };

  /**
   * These are the functions you'll usually want to call
   */
  return {
    hex_md4: s => binl2hex(core_md4(str2binl(s), s.length * chrsz)),
    b64_md4: s => binl2b64(core_md4(str2binl(s), s.length * chrsz)),
    str_md4: s => binl2str(core_md4(str2binl(s), s.length * chrsz)),
    hex_hmac_md4: (key, data) => binl2hex(core_hmac_md4(key, data)),
    b64_hmac_md4: (key, data) => binl2b64(core_hmac_md4(key, data)),
    str_hmac_md4: (key, data) => binl2str(core_hmac_md4(key, data)),
  };

};

const md4 = md4func();
console.log(md4.hex_md4('Rosetta Code'));