function binl(x, len) {
        var i, olda, oldb, oldc, oldd,
          a = 1732584193,
          b = -271733879,
          c = -1732584194,
          d = 271733878;

        /* append padding */
        x[len >> 5] |= 0x80 << ((len) % 32);
        x[(((len + 64) >>> 9) << 4) + 14] = len;

        for (i = 0; i < x.length; i += 16) {
          olda = a;
          oldb = b;
          oldc = c;
          oldd = d;

          a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
          d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
          c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
          b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
          a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
          d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
          c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
          b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
          a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
          d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
          c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
          b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
          a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
          d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
          c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
          b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);

          a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
          d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
          c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
          b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
          a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
          d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
          c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
          b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
          a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
          d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
          c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
          b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
          a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
          d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
          c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
          b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

          a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
          d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
          c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
          b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
          a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
          d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
          c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
          b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
          a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
          d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
          c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
          b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
          a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
          d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
          c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
          b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);

          a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
          d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
          c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
          b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
          a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
          d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
          c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
          b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
          a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
          d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
          c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
          b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
          a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
          d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
          c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
          b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);

          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);
      }
Calculate the MD5 of an array of little-endian words, and a bit length.