The SHA (Secure Hash Algorithm) can be used to encrypt data for secure transfer between applications.
The SHA512() function returns a string with the SHA512 encrypted hash as a 128-character hexadecimal string.
It is fully compatible with UTF-8 encoding.

Code of the SHA512() function

/*
*  Secure Hash Algorithm (SHA512)
*  http://www.happycode.info/
*/

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);
}
- Usage:
1. Copy the SHA512() function into your JavaScript script.
2. To get the SHA512 hash of a string, calls the SHA512() function:   SHA512('string'); .

- Example. The string entered into an input text field will be encrypted with SHA512, and added into another input form field.
<form action="#" method="post">
Enter a text:<br/>
<input type="text" name="strex" id="strex" size="20" /> <button id="cryptstr">Encrypt</button><br/>
SHA512 hash string:<br/>
<input type="text" name="strcrypt" id="strcrypt" size="33" />
</form>
<script type="text/javascript">
// Here add the code of SHA512 function

// register onclick events for Encrypt button
document.getElementById('cryptstr').onclick = function() {
var txt_string = document.getElementById('strex').value;    // gets data from input text

// encrypts data and adds it in #strcrypt element
document.getElementById('strcrypt').value = SHA512(txt_string);
return false;
}
</script>
Demo:
Enter a text:

SHA512 hash string:

Daily Test with Code Example

HTML
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SHA512 Encrypt hash in JavaScript

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