docs: function(options) {
        /**
         * Private properties configuration variables. You may need to tweak these to be compatible with
         * the server-side, but the defaults work in most cases.
         * @see this.setUpperCase() method
         * @see this.setPad() method
         */
        var hexcase = (options && typeof options.uppercase === 'boolean') ? options.uppercase : false,
          /* hexadecimal output case format. false - lowercase; true - uppercase  */
          b64pad = (options && typeof options.pad === 'string') ? options.pad : '=',
          /* base-64 pad character. Default '=' for strict RFC compliance   */
          utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true,
          /* enable/disable utf8 encoding */
          sha512_k;
  
        /* privileged (public) methods */
        this.hex = function(s) {
          return rstr2hex(rstr(s));
        };
        this.b64 = function(s) {
          return rstr2b64(rstr(s), b64pad);
        };
        this.any = function(s, e) {
          return rstr2any(rstr(s), e);
        };
        this.raw = function(s) {
          return rstr(s, utf8);
        };
        this.hex_hmac = function(k, d) {
          return rstr2hex(rstr_hmac(k, d));
        };
        this.b64_hmac = function(k, d) {
          return rstr2b64(rstr_hmac(k, d), b64pad);
        };
        this.any_hmac = function(k, d, e) {
          return rstr2any(rstr_hmac(k, d), e);
        };
        /**
         * Perform a simple self-test to see if the VM is working
         * @return {String} Hexadecimal hash sample
         * @public
         */
        this.vm_test = function() {
          return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
        };
        /**
         * @description Enable/disable uppercase hexadecimal returned string
         * @param {boolean}
         * @return {Object} this
         * @public
         */
        this.setUpperCase = function(a) {
          if (typeof a === 'boolean') {
            hexcase = a;
          }
          return this;
        };
        /**
         * @description Defines a base64 pad string
         * @param {string} Pad
         * @return {Object} this
         * @public
         */
        this.setPad = function(a) {
          b64pad = a || b64pad;
          return this;
        };
        /**
         * @description Defines a base64 pad string
         * @param {boolean}
         * @return {Object} this
         * @public
         */
        this.setUTF8 = function(a) {
          if (typeof a === 'boolean') {
            utf8 = a;
          }
          return this;
        };
  
        /* private methods */
  
        /**
         * Calculate the SHA-512 of a raw string
         */
  
        function rstr(s) {
          s = (utf8) ? utf8Encode(s) : s;
          return binb2rstr(binb(rstr2binb(s), s.length * 8));
        }
        /*
         * Calculate the HMAC-SHA-512 of a key and some data (raw strings)
         */
  
        function rstr_hmac(key, data) {
          key = (utf8) ? utf8Encode(key) : key;
          data = (utf8) ? utf8Encode(data) : data;
  
          var hash, i = 0,
            bkey = rstr2binb(key),
            ipad = Array(32),
            opad = Array(32);
  
          if (bkey.length > 32) {
            bkey = binb(bkey, key.length * 8);
          }
  
          for (; i < 32; i += 1) {
            ipad[i] = bkey[i] ^ 0x36363636;
            opad[i] = bkey[i] ^ 0x5C5C5C5C;
          }
  
          hash = binb(ipad.concat(rstr2binb(data)), 1024 + data.length * 8);
          return binb2rstr(binb(opad.concat(hash), 1024 + 512));
        }
  
        /**
         * Calculate the SHA-512 of an array of big-endian dwords, and a bit length
         */
  
        function binb(x, len) {
          var j, i, l,
            W = new Array(80),
            hash = new Array(16),
            //Initial hash values
            H = [
              new int64(0x6a09e667, -205731576),
              new int64(-1150833019, -2067093701),
              new int64(0x3c6ef372, -23791573),
              new int64(-1521486534, 0x5f1d36f1),
              new int64(0x510e527f, -1377402159),
              new int64(-1694144372, 0x2b3e6c1f),
              new int64(0x1f83d9ab, -79577749),
              new int64(0x5be0cd19, 0x137e2179)
            ],
            T1 = new int64(0, 0),
            T2 = new int64(0, 0),
            a = new int64(0, 0),
            b = new int64(0, 0),
            c = new int64(0, 0),
            d = new int64(0, 0),
            e = new int64(0, 0),
            f = new int64(0, 0),
            g = new int64(0, 0),
            h = new int64(0, 0),
            //Temporary variables not specified by the document
            s0 = new int64(0, 0),
            s1 = new int64(0, 0),
            Ch = new int64(0, 0),
            Maj = new int64(0, 0),
            r1 = new int64(0, 0),
            r2 = new int64(0, 0),
            r3 = new int64(0, 0);
  
          if (sha512_k === undefined) {
            //SHA512 constants
            sha512_k = [
              new int64(0x428a2f98, -685199838), new int64(0x71374491, 0x23ef65cd),
              new int64(-1245643825, -330482897), new int64(-373957723, -2121671748),
              new int64(0x3956c25b, -213338824), new int64(0x59f111f1, -1241133031),
              new int64(-1841331548, -1357295717), new int64(-1424204075, -630357736),
              new int64(-670586216, -1560083902), new int64(0x12835b01, 0x45706fbe),
              new int64(0x243185be, 0x4ee4b28c), new int64(0x550c7dc3, -704662302),
              new int64(0x72be5d74, -226784913), new int64(-2132889090, 0x3b1696b1),
              new int64(-1680079193, 0x25c71235), new int64(-1046744716, -815192428),
              new int64(-459576895, -1628353838), new int64(-272742522, 0x384f25e3),
              new int64(0xfc19dc6, -1953704523), new int64(0x240ca1cc, 0x77ac9c65),
              new int64(0x2de92c6f, 0x592b0275), new int64(0x4a7484aa, 0x6ea6e483),
              new int64(0x5cb0a9dc, -1119749164), new int64(0x76f988da, -2096016459),
              new int64(-1740746414, -295247957), new int64(-1473132947, 0x2db43210),
              new int64(-1341970488, -1728372417), new int64(-1084653625, -1091629340),
              new int64(-958395405, 0x3da88fc2), new int64(-710438585, -1828018395),
              new int64(0x6ca6351, -536640913), new int64(0x14292967, 0xa0e6e70),
              new int64(0x27b70a85, 0x46d22ffc), new int64(0x2e1b2138, 0x5c26c926),
              new int64(0x4d2c6dfc, 0x5ac42aed), new int64(0x53380d13, -1651133473),
              new int64(0x650a7354, -1951439906), new int64(0x766a0abb, 0x3c77b2a8),
              new int64(-2117940946, 0x47edaee6), new int64(-1838011259, 0x1482353b),
              new int64(-1564481375, 0x4cf10364), new int64(-1474664885, -1136513023),
              new int64(-1035236496, -789014639), new int64(-949202525, 0x654be30),
              new int64(-778901479, -688958952), new int64(-694614492, 0x5565a910),
              new int64(-200395387, 0x5771202a), new int64(0x106aa070, 0x32bbd1b8),
              new int64(0x19a4c116, -1194143544), new int64(0x1e376c08, 0x5141ab53),
              new int64(0x2748774c, -544281703), new int64(0x34b0bcb5, -509917016),
              new int64(0x391c0cb3, -976659869), new int64(0x4ed8aa4a, -482243893),
              new int64(0x5b9cca4f, 0x7763e373), new int64(0x682e6ff3, -692930397),
              new int64(0x748f82ee, 0x5defb2fc), new int64(0x78a5636f, 0x43172f60),
              new int64(-2067236844, -1578062990), new int64(-1933114872, 0x1a6439ec),
              new int64(-1866530822, 0x23631e28), new int64(-1538233109, -561857047),
              new int64(-1090935817, -1295615723), new int64(-965641998, -479046869),
              new int64(-903397682, -366583396), new int64(-779700025, 0x21c0c207),
              new int64(-354779690, -840897762), new int64(-176337025, -294727304),
              new int64(0x6f067aa, 0x72176fba), new int64(0xa637dc5, -1563912026),
              new int64(0x113f9804, -1090974290), new int64(0x1b710b35, 0x131c471b),
              new int64(0x28db77f5, 0x23047d84), new int64(0x32caab7b, 0x40c72493),
              new int64(0x3c9ebe0a, 0x15c9bebc), new int64(0x431d67c4, -1676669620),
              new int64(0x4cc5d4be, -885112138), new int64(0x597f299c, -60457430),
              new int64(0x5fcb6fab, 0x3ad6faec), new int64(0x6c44198c, 0x4a475817)
            ];
          }
  
          for (i = 0; i < 80; i += 1) {
            W[i] = new int64(0, 0);
          }
  
          // append padding to the source string. The format is described in the FIPS.
          x[len >> 5] |= 0x80 << (24 - (len & 0x1f));
          x[((len + 128 >> 10) << 5) + 31] = len;
          l = x.length;
          for (i = 0; i < l; i += 32) { //32 dwords is the block size
            int64copy(a, H[0]);
            int64copy(b, H[1]);
            int64copy(c, H[2]);
            int64copy(d, H[3]);
            int64copy(e, H[4]);
            int64copy(f, H[5]);
            int64copy(g, H[6]);
            int64copy(h, H[7]);
  
            for (j = 0; j < 16; j += 1) {
              W[j].h = x[i + 2 * j];
              W[j].l = x[i + 2 * j + 1];
            }
  
            for (j = 16; j < 80; j += 1) {
              //sigma1
              int64rrot(r1, W[j - 2], 19);
              int64revrrot(r2, W[j - 2], 29);
              int64shr(r3, W[j - 2], 6);
              s1.l = r1.l ^ r2.l ^ r3.l;
              s1.h = r1.h ^ r2.h ^ r3.h;
              //sigma0
              int64rrot(r1, W[j - 15], 1);
              int64rrot(r2, W[j - 15], 8);
              int64shr(r3, W[j - 15], 7);
              s0.l = r1.l ^ r2.l ^ r3.l;
              s0.h = r1.h ^ r2.h ^ r3.h;
  
              int64add4(W[j], s1, W[j - 7], s0, W[j - 16]);
            }
  
            for (j = 0; j < 80; j += 1) {
              //Ch
              Ch.l = (e.l & f.l) ^ (~e.l & g.l);
              Ch.h = (e.h & f.h) ^ (~e.h & g.h);
  
              //Sigma1
              int64rrot(r1, e, 14);
              int64rrot(r2, e, 18);
              int64revrrot(r3, e, 9);
              s1.l = r1.l ^ r2.l ^ r3.l;
              s1.h = r1.h ^ r2.h ^ r3.h;
  
              //Sigma0
              int64rrot(r1, a, 28);
              int64revrrot(r2, a, 2);
              int64revrrot(r3, a, 7);
              s0.l = r1.l ^ r2.l ^ r3.l;
              s0.h = r1.h ^ r2.h ^ r3.h;
  
              //Maj
              Maj.l = (a.l & b.l) ^ (a.l & c.l) ^ (b.l & c.l);
              Maj.h = (a.h & b.h) ^ (a.h & c.h) ^ (b.h & c.h);
  
              int64add5(T1, h, s1, Ch, sha512_k[j], W[j]);
              int64add(T2, s0, Maj);
  
              int64copy(h, g);
              int64copy(g, f);
              int64copy(f, e);
              int64add(e, d, T1);
              int64copy(d, c);
              int64copy(c, b);
              int64copy(b, a);
              int64add(a, T1, T2);
            }
            int64add(H[0], H[0], a);
            int64add(H[1], H[1], b);
            int64add(H[2], H[2], c);
            int64add(H[3], H[3], d);
            int64add(H[4], H[4], e);
            int64add(H[5], H[5], f);
            int64add(H[6], H[6], g);
            int64add(H[7], H[7], h);
          }
  
          //represent the hash as an array of 32-bit dwords
          for (i = 0; i < 8; i += 1) {
            hash[2 * i] = H[i].h;
            hash[2 * i + 1] = H[i].l;
          }
          return hash;
        }
  
        //A constructor for 64-bit numbers
  
        function int64(h, l) {
          this.h = h;
          this.l = l;
          //this.toString = int64toString;
        }
  
        //Copies src into dst, assuming both are 64-bit numbers
  
        function int64copy(dst, src) {
          dst.h = src.h;
          dst.l = src.l;
        }
  
        //Right-rotates a 64-bit number by shift
        //Won't handle cases of shift>=32
        //The function revrrot() is for that
  
        function int64rrot(dst, x, shift) {
          dst.l = (x.l >>> shift) | (x.h << (32 - shift));
          dst.h = (x.h >>> shift) | (x.l << (32 - shift));
        }
  
        //Reverses the dwords of the source and then rotates right by shift.
        //This is equivalent to rotation by 32+shift
  
        function int64revrrot(dst, x, shift) {
          dst.l = (x.h >>> shift) | (x.l << (32 - shift));
          dst.h = (x.l >>> shift) | (x.h << (32 - shift));
        }
  
        //Bitwise-shifts right a 64-bit number by shift
        //Won't handle shift>=32, but it's never needed in SHA512
  
        function int64shr(dst, x, shift) {
          dst.l = (x.l >>> shift) | (x.h << (32 - shift));
          dst.h = (x.h >>> shift);
        }
  
        //Adds two 64-bit numbers
        //Like the original implementation, does not rely on 32-bit operations
  
        function int64add(dst, x, y) {
          var w0 = (x.l & 0xffff) + (y.l & 0xffff);
          var w1 = (x.l >>> 16) + (y.l >>> 16) + (w0 >>> 16);
          var w2 = (x.h & 0xffff) + (y.h & 0xffff) + (w1 >>> 16);
          var w3 = (x.h >>> 16) + (y.h >>> 16) + (w2 >>> 16);
          dst.l = (w0 & 0xffff) | (w1 << 16);
          dst.h = (w2 & 0xffff) | (w3 << 16);
        }
  
        //Same, except with 4 addends. Works faster than adding them one by one.
  
        function int64add4(dst, a, b, c, d) {
          var w0 = (a.l & 0xffff) + (b.l & 0xffff) + (c.l & 0xffff) + (d.l & 0xffff);
          var w1 = (a.l >>> 16) + (b.l >>> 16) + (c.l >>> 16) + (d.l >>> 16) + (w0 >>> 16);
          var w2 = (a.h & 0xffff) + (b.h & 0xffff) + (c.h & 0xffff) + (d.h & 0xffff) + (w1 >>> 16);
          var w3 = (a.h >>> 16) + (b.h >>> 16) + (c.h >>> 16) + (d.h >>> 16) + (w2 >>> 16);
          dst.l = (w0 & 0xffff) | (w1 << 16);
          dst.h = (w2 & 0xffff) | (w3 << 16);
        }
  
        //Same, except with 5 addends
  
        function int64add5(dst, a, b, c, d, e) {
          var w0 = (a.l & 0xffff) + (b.l & 0xffff) + (c.l & 0xffff) + (d.l & 0xffff) + (e.l & 0xffff),
            w1 = (a.l >>> 16) + (b.l >>> 16) + (c.l >>> 16) + (d.l >>> 16) + (e.l >>> 16) + (w0 >>> 16),
            w2 = (a.h & 0xffff) + (b.h & 0xffff) + (c.h & 0xffff) + (d.h & 0xffff) + (e.h & 0xffff) + (w1 >>> 16),
            w3 = (a.h >>> 16) + (b.h >>> 16) + (c.h >>> 16) + (d.h >>> 16) + (e.h >>> 16) + (w2 >>> 16);
          dst.l = (w0 & 0xffff) | (w1 << 16);
          dst.h = (w2 & 0xffff) | (w3 << 16);
        }
      }