One of the ways I have learnt to reduce my server load is to do most the leg work on the client via JavaScript.

One of the projects I was working, I significantly reduced the server load just by hashing the passwords and token on the client side.

Below is a demo of SHA512 encrypted hash (128-character):

Demo - Hash Data

Hash



Javascript Hash Function:

function SHA512(str) {
  function int64(msint_32, lsint_32) {
    this.highOrder = msint_32;
    this.lowOrder = lsint_32;
  }

  var H = [new int64(0x6a09e667, 0xf3bcc908), new int64(0xbb67ae85, 0x84caa73b),
      new int64(0x3c6ef372, 0xfe94f82b), new int64(0xa54ff53a, 0x5f1d36f1),
      new int64(0x510e527f, 0xade682d1), new int64(0x9b05688c, 0x2b3e6c1f),
      new int64(0x1f83d9ab, 0xfb41bd6b), new int64(0x5be0cd19, 0x137e2179)];

  var K = [new int64(0x428a2f98, 0xd728ae22), new int64(0x71374491, 0x23ef65cd),
      new int64(0xb5c0fbcf, 0xec4d3b2f), new int64(0xe9b5dba5, 0x8189dbbc),
      new int64(0x3956c25b, 0xf348b538), new int64(0x59f111f1, 0xb605d019),
      new int64(0x923f82a4, 0xaf194f9b), new int64(0xab1c5ed5, 0xda6d8118),
      new int64(0xd807aa98, 0xa3030242), new int64(0x12835b01, 0x45706fbe),
      new int64(0x243185be, 0x4ee4b28c), new int64(0x550c7dc3, 0xd5ffb4e2),
      new int64(0x72be5d74, 0xf27b896f), new int64(0x80deb1fe, 0x3b1696b1),
      new int64(0x9bdc06a7, 0x25c71235), new int64(0xc19bf174, 0xcf692694),
      new int64(0xe49b69c1, 0x9ef14ad2), new int64(0xefbe4786, 0x384f25e3),
      new int64(0x0fc19dc6, 0x8b8cd5b5), new int64(0x240ca1cc, 0x77ac9c65),
      new int64(0x2de92c6f, 0x592b0275), new int64(0x4a7484aa, 0x6ea6e483),
      new int64(0x5cb0a9dc, 0xbd41fbd4), new int64(0x76f988da, 0x831153b5),
      new int64(0x983e5152, 0xee66dfab), new int64(0xa831c66d, 0x2db43210),
      new int64(0xb00327c8, 0x98fb213f), new int64(0xbf597fc7, 0xbeef0ee4),
      new int64(0xc6e00bf3, 0x3da88fc2), new int64(0xd5a79147, 0x930aa725),
      new int64(0x06ca6351, 0xe003826f), new int64(0x14292967, 0x0a0e6e70),
      new int64(0x27b70a85, 0x46d22ffc), new int64(0x2e1b2138, 0x5c26c926),
      new int64(0x4d2c6dfc, 0x5ac42aed), new int64(0x53380d13, 0x9d95b3df),
      new int64(0x650a7354, 0x8baf63de), new int64(0x766a0abb, 0x3c77b2a8),
      new int64(0x81c2c92e, 0x47edaee6), new int64(0x92722c85, 0x1482353b),
      new int64(0xa2bfe8a1, 0x4cf10364), new int64(0xa81a664b, 0xbc423001),
      new int64(0xc24b8b70, 0xd0f89791), new int64(0xc76c51a3, 0x0654be30),
      new int64(0xd192e819, 0xd6ef5218), new int64(0xd6990624, 0x5565a910),
      new int64(0xf40e3585, 0x5771202a), new int64(0x106aa070, 0x32bbd1b8),
      new int64(0x19a4c116, 0xb8d2d0c8), new int64(0x1e376c08, 0x5141ab53),
      new int64(0x2748774c, 0xdf8eeb99), new int64(0x34b0bcb5, 0xe19b48a8),
      new int64(0x391c0cb3, 0xc5c95a63), new int64(0x4ed8aa4a, 0xe3418acb),
      new int64(0x5b9cca4f, 0x7763e373), new int64(0x682e6ff3, 0xd6b2b8a3),
      new int64(0x748f82ee, 0x5defb2fc), new int64(0x78a5636f, 0x43172f60),
      new int64(0x84c87814, 0xa1f0ab72), new int64(0x8cc70208, 0x1a6439ec),
      new int64(0x90befffa, 0x23631e28), new int64(0xa4506ceb, 0xde82bde9),
      new int64(0xbef9a3f7, 0xb2c67915), new int64(0xc67178f2, 0xe372532b),
      new int64(0xca273ece, 0xea26619c), new int64(0xd186b8c7, 0x21c0c207),
      new int64(0xeada7dd6, 0xcde0eb1e), new int64(0xf57d4f7f, 0xee6ed178),
      new int64(0x06f067aa, 0x72176fba), new int64(0x0a637dc5, 0xa2c898a6),
      new int64(0x113f9804, 0xbef90dae), new int64(0x1b710b35, 0x131c471b),
      new int64(0x28db77f5, 0x23047d84), new int64(0x32caab7b, 0x40c72493),
      new int64(0x3c9ebe0a, 0x15c9bebc), new int64(0x431d67c4, 0x9c100d4c),
      new int64(0x4cc5d4be, 0xcb3e42b6), new int64(0x597f299c, 0xfc657e2a),
      new int64(0x5fcb6fab, 0x3ad6faec), new int64(0x6c44198c, 0x4a475817)];

  var W = new Array(64);
  var a, b, c, d, e, f, g, h, i, j;
  var T1, T2;
  var charsize = 8;

  function utf8_encode(str) {
    return unescape(encodeURIComponent(str));
  }

  function str2binb(str) {
    var bin = [];
    var mask = (1 << charsize) - 1;
    var len = str.length * charsize;

    for (var i = 0; i < len; i += charsize) {
      bin[i >> 5] |= (str.charCodeAt(i / charsize) & mask) << (32 - charsize - (i % 32));
    }

    return bin;
  }

  function binb2hex(binarray) {
    var hex_tab = "0123456789abcdef";
    var str = "";
    var length = binarray.length * 4;
    var srcByte;

    for (var i = 0; i < length; i += 1) {
      srcByte = binarray[i >> 2] >> ((3 - (i % 4)) * 8);
      str += hex_tab.charAt((srcByte >> 4) & 0xF) + hex_tab.charAt(srcByte & 0xF);
    }

    return str;
  }

  function safe_add_2(x, y) {
    var lsw, msw, lowOrder, highOrder;

    lsw = (x.lowOrder & 0xFFFF) + (y.lowOrder & 0xFFFF);
    msw = (x.lowOrder >>> 16) + (y.lowOrder >>> 16) + (lsw >>> 16);
    lowOrder = ((msw & 0xFFFF) << 16) | (lsw & 0xFFFF);

    lsw = (x.highOrder & 0xFFFF) + (y.highOrder & 0xFFFF) + (msw >>> 16);
    msw = (x.highOrder >>> 16) + (y.highOrder >>> 16) + (lsw >>> 16);
    highOrder = ((msw & 0xFFFF) << 16) | (lsw & 0xFFFF);

    return new int64(highOrder, lowOrder);
  }

  function safe_add_4(a, b, c, d) {
    var lsw, msw, lowOrder, highOrder;

    lsw = (a.lowOrder & 0xFFFF) + (b.lowOrder & 0xFFFF) + (c.lowOrder & 0xFFFF) + (d.lowOrder & 0xFFFF);
    msw = (a.lowOrder >>> 16) + (b.lowOrder >>> 16) + (c.lowOrder >>> 16) + (d.lowOrder >>> 16) + (lsw >>> 16);
    lowOrder = ((msw & 0xFFFF) << 16) | (lsw & 0xFFFF);

    lsw = (a.highOrder & 0xFFFF) + (b.highOrder & 0xFFFF) + (c.highOrder & 0xFFFF) + (d.highOrder & 0xFFFF) + (msw >>> 16);
    msw = (a.highOrder >>> 16) + (b.highOrder >>> 16) + (c.highOrder >>> 16) + (d.highOrder >>> 16) + (lsw >>> 16);
    highOrder = ((msw & 0xFFFF) << 16) | (lsw & 0xFFFF);

    return new int64(highOrder, lowOrder);
  }

  function safe_add_5(a, b, c, d, e) {
    var lsw, msw, lowOrder, highOrder;

    lsw = (a.lowOrder & 0xFFFF) + (b.lowOrder & 0xFFFF) + (c.lowOrder & 0xFFFF) + (d.lowOrder & 0xFFFF) + (e.lowOrder & 0xFFFF);
    msw = (a.lowOrder >>> 16) + (b.lowOrder >>> 16) + (c.lowOrder >>> 16) + (d.lowOrder >>> 16) + (e.lowOrder >>> 16) + (lsw >>> 16);
    lowOrder = ((msw & 0xFFFF) << 16) | (lsw & 0xFFFF);

    lsw = (a.highOrder & 0xFFFF) + (b.highOrder & 0xFFFF) + (c.highOrder & 0xFFFF) + (d.highOrder & 0xFFFF) + (e.highOrder & 0xFFFF) + (msw >>> 16);
    msw = (a.highOrder >>> 16) + (b.highOrder >>> 16) + (c.highOrder >>> 16) + (d.highOrder >>> 16) + (e.highOrder >>> 16) + (lsw >>> 16);
    highOrder = ((msw & 0xFFFF) << 16) | (lsw & 0xFFFF);

    return new int64(highOrder, lowOrder);
  }

  function maj(x, y, z) {
    return new int64(
      (x.highOrder & y.highOrder) ^ (x.highOrder & z.highOrder) ^ (y.highOrder & z.highOrder),
      (x.lowOrder & y.lowOrder) ^ (x.lowOrder & z.lowOrder) ^ (y.lowOrder & z.lowOrder)
    );
  }

  function ch(x, y, z) {
    return new int64(
      (x.highOrder & y.highOrder) ^ (~x.highOrder & z.highOrder),
      (x.lowOrder & y.lowOrder) ^ (~x.lowOrder & z.lowOrder)
    );
  }

  function rotr(x, n) {
    if (n <= 32) {
      return new int64(
       (x.highOrder >>> n) | (x.lowOrder << (32 - n)),
       (x.lowOrder >>> n) | (x.highOrder << (32 - n))
      );
    } else {
      return new int64(
       (x.lowOrder >>> n) | (x.highOrder << (32 - n)),
       (x.highOrder >>> n) | (x.lowOrder << (32 - n))
      );
    }
  }

  function sigma0(x) {
    var rotr28 = rotr(x, 28);
    var rotr34 = rotr(x, 34);
    var rotr39 = rotr(x, 39);

    return new int64(
      rotr28.highOrder ^ rotr34.highOrder ^ rotr39.highOrder,
      rotr28.lowOrder ^ rotr34.lowOrder ^ rotr39.lowOrder
    );
  }

  function sigma1(x) {
    var rotr14 = rotr(x, 14);
    var rotr18 = rotr(x, 18);
    var rotr41 = rotr(x, 41);

    return new int64(
      rotr14.highOrder ^ rotr18.highOrder ^ rotr41.highOrder,
      rotr14.lowOrder ^ rotr18.lowOrder ^ rotr41.lowOrder
    );
  }

  function gamma0(x) {
    var rotr1 = rotr(x, 1), rotr8 = rotr(x, 8), shr7 = shr(x, 7);

    return new int64(
      rotr1.highOrder ^ rotr8.highOrder ^ shr7.highOrder,
      rotr1.lowOrder ^ rotr8.lowOrder ^ shr7.lowOrder
    );
  }

  function gamma1(x) {
    var rotr19 = rotr(x, 19);
    var rotr61 = rotr(x, 61);
    var shr6 = shr(x, 6);

    return new int64(
      rotr19.highOrder ^ rotr61.highOrder ^ shr6.highOrder,
      rotr19.lowOrder ^ rotr61.lowOrder ^ shr6.lowOrder
    );
  }

  function shr(x, n) {
    if (n <= 32) {
      return new int64(
       x.highOrder >>> n,
       x.lowOrder >>> n | (x.highOrder << (32 - n))
      );
    } else {
      return new int64(
       0,
       x.highOrder << (32 - n)
      );
    }
  }

  str = utf8_encode(str);
  strlen = str.length*charsize;
  str = str2binb(str);

  str[strlen >> 5] |= 0x80 << (24 - strlen % 32);
  str[(((strlen + 128) >> 10) << 5) + 31] = strlen;

  for (var i = 0; i < str.length; i += 32) {
    a = H[0];
    b = H[1];
    c = H[2];
    d = H[3];
    e = H[4];
    f = H[5];
    g = H[6];
    h = H[7];

    for (var j = 0; j < 80; j++) {
      if (j < 16) {
       W[j] = new int64(str[j*2 + i], str[j*2 + i + 1]);
      } else {
       W[j] = safe_add_4(gamma1(W[j - 2]), W[j - 7], gamma0(W[j - 15]), W[j - 16]);
      }

      T1 = safe_add_5(h, sigma1(e), ch(e, f, g), K[j], W[j]);
      T2 = safe_add_2(sigma0(a), maj(a, b, c));
      h = g;
      g = f;
      f = e;
      e = safe_add_2(d, T1);
      d = c;
      c = b;
      b = a;
      a = safe_add_2(T1, T2);
    }

    H[0] = safe_add_2(a, H[0]);
    H[1] = safe_add_2(b, H[1]);
    H[2] = safe_add_2(c, H[2]);
    H[3] = safe_add_2(d, H[3]);
    H[4] = safe_add_2(e, H[4]);
    H[5] = safe_add_2(f, H[5]);
    H[6] = safe_add_2(g, H[6]);
    H[7] = safe_add_2(h, H[7]);
  }

  var binarray = [];
  for (var i = 0; i < H.length; i++) {
    binarray.push(H[i].highOrder);
    binarray.push(H[i].lowOrder);
  }
  return binb2hex(binarray);
}

How To Use Javascript Hash Function

var hash = SHA512(user_string))



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