/**

• DES加密解密
• @copyright Copyright (c) 2006
• @author Guapo
• @see DESCore
  */

/*

• encrypt the string to string made up of hex

• return the encrypted string
  */
  function strEnc(data, firstKey, secondKey, thirdKey) {

  var leng = data.length;
  var encData = "";
  var firstKeyBt, secondKeyBt, thirdKeyBt, firstLength, secondLength, thirdLength;
  if (firstKey != null && firstKey != "") {
  firstKeyBt = getKeyBytes(firstKey);
  firstLength = firstKeyBt.length;
  }
  if (secondKey != null && secondKey != "") {
  secondKeyBt = getKeyBytes(secondKey);
  secondLength = secondKeyBt.length;
  }
  if (thirdKey != null && thirdKey != "") {
  thirdKeyBt = getKeyBytes(thirdKey);
  thirdLength = thirdKeyBt.length;
  }

  if (leng > 0) {
  if (leng < 4) {
  var bt = strToBt(data);
  var encByte;
  if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
  var tempBt;
  var x, y, z;
  tempBt = bt;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  for (y = 0; y < secondLength; y++) {
  tempBt = enc(tempBt, secondKeyBt[y]);
  }
  for (z = 0; z < thirdLength; z++) {
  tempBt = enc(tempBt, thirdKeyBt[z]);
  }
  encByte = tempBt;
  } else {
  if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
  var tempBt;
  var x, y;
  tempBt = bt;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  for (y = 0; y < secondLength; y++) {
  tempBt = enc(tempBt, secondKeyBt[y]);
  }
  encByte = tempBt;
  } else {
  if (firstKey != null && firstKey != "") {
  var tempBt;
  var x = 0;
  tempBt = bt;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  encByte = tempBt;
  }
  }
  }
  encData = bt64ToHex(encByte);
  } else {
  var iterator = parseInt(leng / 4);
  var remainder = leng % 4;
  var i = 0;
  for (i = 0; i < iterator; i++) {
  var tempData = data.substring(i * 4 + 0, i * 4 + 4);
  var tempByte = strToBt(tempData);
  var encByte;
  if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
  var tempBt;
  var x, y, z;
  tempBt = tempByte;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  for (y = 0; y < secondLength; y++) {
  tempBt = enc(tempBt, secondKeyBt[y]);
  }
  for (z = 0; z < thirdLength; z++) {
  tempBt = enc(tempBt, thirdKeyBt[z]);
  }
  encByte = tempBt;
  } else {
  if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
  var tempBt;
  var x, y;
  tempBt = tempByte;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  for (y = 0; y < secondLength; y++) {
  tempBt = enc(tempBt, secondKeyBt[y]);
  }
  encByte = tempBt;
  } else {
  if (firstKey != null && firstKey != "") {
  var tempBt;
  var x;
  tempBt = tempByte;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  encByte = tempBt;
  }
  }
  }
  encData += bt64ToHex(encByte);
  }
  if (remainder > 0) {
  var remainderData = data.substring(iterator * 4 + 0, leng);
  var tempByte = strToBt(remainderData);
  var encByte;
  if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") {
  var tempBt;
  var x, y, z;
  tempBt = tempByte;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  for (y = 0; y < secondLength; y++) {
  tempBt = enc(tempBt, secondKeyBt[y]);
  }
  for (z = 0; z < thirdLength; z++) {
  tempBt = enc(tempBt, thirdKeyBt[z]);
  }
  encByte = tempBt;
  } else {
  if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") {
  var tempBt;
  var x, y;
  tempBt = tempByte;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  for (y = 0; y < secondLength; y++) {
  tempBt = enc(tempBt, secondKeyBt[y]);
  }
  encByte = tempBt;
  } else {
  if (firstKey != null && firstKey != "") {
  var tempBt;
  var x;
  tempBt = tempByte;
  for (x = 0; x < firstLength; x++) {
  tempBt = enc(tempBt, firstKeyBt[x]);
  }
  encByte = tempBt;
  }
  }
  }
  encData += bt64ToHex(encByte);
  }
  }
  }
  return encData;
  }

在其他位置，又有如下：
$("#rsa").val(strEnc(u + p + b, '1', '2', '3'));
u + p + b 对应如上面函数参数的data ,1、2、3对应firstkey、secondkey、thirdkey

此函数如何在EXEC JS seting 调用呢？