/*
 * js-md5 v0.1.1
 * https://github.com/emn178/js-md2
 *
 * Copyright 2014, emn178@gmail.com
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */

;(function(root, undefined){
  'use strict';

  var HEX_CHARS = "0123456789abcdef";
  var HEX_TABLE = {
    '0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,
    'a': 10, 'b': 11, 'c': 12, 'd': 13, 'e': 14, 'f': 15,
    'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15
  };

  var S = [ 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13,
            0x62, 0xA7, 0x05, 0xF3, 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C, 0x82, 0xCA, 
            0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16, 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 
            0xBE, 0x4E, 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E, 0xBB, 0x2F, 0xEE, 0x7A, 
            0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2, 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
            0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E, 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 
            0xFF, 0x19, 0x30, 0xB3, 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56, 0xAA, 0xC6, 
            0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6, 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 
            0x45, 0x9D, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65, 0xE6, 0x2D, 0xA8, 0x02, 
            0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0, 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F, 
            0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C, 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 
            0x2C, 0x53, 0x0D, 0x6E, 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81, 0x4D, 0x52, 
            0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA, 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 
            0x78, 0x88, 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE, 0x3B, 0x00, 0x1D, 0x39, 
            0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A, 
            0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14];

  var md2 = function(message) {
    var M = hasUTF8(message) ? UTF8toBlocks(message) : ASCIItoBlocks(message);
    appendChecksum(M);

    var X = [];
    for(var i = 0;i < 48;++i)
      X[i] = 0;
    var length = M.length >> 4;
    for(var i = 0;i < length;++i)
    {
      for(var j = 0;j < 16;++j)
      {
        X[16 + j] = M[(i << 4) + j];
        X[32 + j] = X[16 + j] ^ X[j];
      }
      var t = 0;
      for(var j = 0;j < 18;++j)
      {
        for(var k = 0;k < 48;++k)
          X[k] = t = X[k] ^ S[t];
        t = (t + j) & 0xFF;
      }
    }

    var hex = '';
    for(var i = 0;i < 16;++i)
      hex += HEX_CHARS.charAt((X[i] >> 4) & 0x0F) + HEX_CHARS.charAt(X[i] & 0x0F);
    return hex;
  };
  
  var hasUTF8 = function(message) {
    for(var i = message.length;i--;)
      if(message.charCodeAt(i) > 127)
        return true;
    return false;
  };

  var ASCIItoBlocks = function(message) {
    // a block is 8 bits(1 bytes), a chunk is 128 bits(16 bytes)
    var length = message.length;
    var chunkCount = (length >> 4) + 1;
    var blockCount = chunkCount << 4; // chunkCount * 16
    var blocks = [];
    var i;
    for(i = 0;i < length;++i)
      blocks[i] = message.charCodeAt(i);
    var ibit = 16 - (length & 15);
    for(;i < blockCount;++i)
      blocks[i] = ibit;
    return blocks;
  };
  
  var UTF8toBlocks = function(message) {
    var uri = encodeURIComponent(message);
    var blocks = [];
    for(var i = 0, bytes = 0, length = uri.length;i < length;++i)
    {
      var c = uri.charCodeAt(i);
      if(c == 37) // %
        blocks[bytes] = (HEX_TABLE[uri.charAt(++i)] << 4) | HEX_TABLE[uri.charAt(++i)];
      else
        blocks[bytes] = c;
      ++bytes;
    }
    var chunkCount = (bytes >> 4) + 1;
    var blockCount = chunkCount << 4; // chunkCount * 4
    var ibit = 16 - (bytes & 15);
    for(var i = bytes;i < blockCount;++i)
      blocks[i] = ibit;
    return blocks;
  };

  var appendChecksum = function(M) {
    var checksum = [];
    var L = 0;
    var length = M.length >> 4;
    for(var i = 0;i < length;++i)
    {
      for(var j = 0;j < 16;++j)
      {
        var c = M[(i << 4) + j];
        checksum[j] ^= S[c ^ L];
        L = checksum[j];
      }
    }
    length = M.length;
    for(var i = 0;i < 16;++i)
      M[length + i] = checksum[i];
  };

  if(typeof(module) != 'undefined')
    module.exports = md2;
  else if(root)
    root.md2 = md2;
}(this));