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.pa : '=',
          /* base-64 pad character. Default '=' for strict RFC compliance   */
          utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true,
          /* enable/disable utf8 encoding */
          rmd160_r1 = [
            0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
            7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
            3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
            1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
            4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
          ],
          rmd160_r2 = [
            5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
            6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
            15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
            8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
            12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
          ],
          rmd160_s1 = [
            11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
            7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
            11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
            11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
            9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
          ],
          rmd160_s2 = [
            8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
            9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
            9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
            15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
            8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
          ];
  
        /* privileged (public) methods */
        this.hex = function(s) {
          return rstr2hex(rstr(s, utf8));
        };
        this.b64 = function(s) {
          return rstr2b64(rstr(s, utf8), b64pad);
        };
        this.any = function(s, e) {
          return rstr2any(rstr(s, utf8), 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) {
          if (typeof a !== 'undefined') {
            b64pad = a;
          }
          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 rmd160 of a raw string
         */
  
        function rstr(s) {
          s = (utf8) ? utf8Encode(s) : s;
          return binl2rstr(binl(rstr2binl(s), s.length * 8));
        }
  
        /**
         * Calculate the HMAC-rmd160 of a key and some data (raw strings)
         */
  
        function rstr_hmac(key, data) {
          key = (utf8) ? utf8Encode(key) : key;
          data = (utf8) ? utf8Encode(data) : data;
          var i, hash,
            bkey = rstr2binl(key),
            ipad = Array(16),
            opad = Array(16);
  
          if (bkey.length > 16) {
            bkey = binl(bkey, key.length * 8);
          }
  
          for (i = 0; i < 16; i += 1) {
            ipad[i] = bkey[i] ^ 0x36363636;
            opad[i] = bkey[i] ^ 0x5C5C5C5C;
          }
          hash = binl(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
          return binl2rstr(binl(opad.concat(hash), 512 + 160));
        }
  
        /**
         * Convert an array of little-endian words to a string
         */
  
        function binl2rstr(input) {
          var i, output = '',
            l = input.length * 32;
          for (i = 0; i < l; i += 8) {
            output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
          }
          return output;
        }
  
        /**
         * Calculate the RIPE-MD160 of an array of little-endian words, and a bit length.
         */
  
        function binl(x, len) {
          var T, j, i, l,
            h0 = 0x67452301,
            h1 = 0xefcdab89,
            h2 = 0x98badcfe,
            h3 = 0x10325476,
            h4 = 0xc3d2e1f0,
            A1, B1, C1, D1, E1,
            A2, B2, C2, D2, E2;
  
          /* append padding */
          x[len >> 5] |= 0x80 << (len % 32);
          x[(((len + 64) >>> 9) << 4) + 14] = len;
          l = x.length;
  
          for (i = 0; i < l; i += 16) {
            A1 = A2 = h0;
            B1 = B2 = h1;
            C1 = C2 = h2;
            D1 = D2 = h3;
            E1 = E2 = h4;
            for (j = 0; j <= 79; j += 1) {
              T = safe_add(A1, rmd160_f(j, B1, C1, D1));
              T = safe_add(T, x[i + rmd160_r1[j]]);
              T = safe_add(T, rmd160_K1(j));
              T = safe_add(bit_rol(T, rmd160_s1[j]), E1);
              A1 = E1;
              E1 = D1;
              D1 = bit_rol(C1, 10);
              C1 = B1;
              B1 = T;
              T = safe_add(A2, rmd160_f(79 - j, B2, C2, D2));
              T = safe_add(T, x[i + rmd160_r2[j]]);
              T = safe_add(T, rmd160_K2(j));
              T = safe_add(bit_rol(T, rmd160_s2[j]), E2);
              A2 = E2;
              E2 = D2;
              D2 = bit_rol(C2, 10);
              C2 = B2;
              B2 = T;
            }
  
            T = safe_add(h1, safe_add(C1, D2));
            h1 = safe_add(h2, safe_add(D1, E2));
            h2 = safe_add(h3, safe_add(E1, A2));
            h3 = safe_add(h4, safe_add(A1, B2));
            h4 = safe_add(h0, safe_add(B1, C2));
            h0 = T;
          }
          return [h0, h1, h2, h3, h4];
        }
  
        // specific algorithm methods
  
        function rmd160_f(j, x, y, z) {
          return (0 <= j && j <= 15) ? (x ^ y ^ z) :
            (16 <= j && j <= 31) ? (x & y) | (~x & z) :
            (32 <= j && j <= 47) ? (x | ~y) ^ z :
            (48 <= j && j <= 63) ? (x & z) | (y & ~z) :
            (64 <= j && j <= 79) ? x ^ (y | ~z) :
            'rmd160_f: j out of range';
        }
  
        function rmd160_K1(j) {
          return (0 <= j && j <= 15) ? 0x00000000 :
            (16 <= j && j <= 31) ? 0x5a827999 :
            (32 <= j && j <= 47) ? 0x6ed9eba1 :
            (48 <= j && j <= 63) ? 0x8f1bbcdc :
            (64 <= j && j <= 79) ? 0xa953fd4e :
            'rmd160_K1: j out of range';
        }
  
        function rmd160_K2(j) {
          return (0 <= j && j <= 15) ? 0x50a28be6 :
            (16 <= j && j <= 31) ? 0x5c4dd124 :
            (32 <= j && j <= 47) ? 0x6d703ef3 :
            (48 <= j && j <= 63) ? 0x7a6d76e9 :
            (64 <= j && j <= 79) ? 0x00000000 :
            'rmd160_K2: j out of range';
        }
      }