javascript解密

最新推荐文章于 2024-08-28 17:15:32 发布

liuwei662656

最新推荐文章于 2024-08-28 17:15:32 发布

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CC 4.0 BY-SA版权

文章标签： javascript 解密加密 input function encoding

本文链接：https://blog.youkuaiyun.com/liuwei662656/article/details/403717

该博客主要展示了使用JavaScript实现脚本加密与解密的代码。定义了加密函数screncode和解密函数strdec，还包含了Base64解码、字符转义等辅助函数。通过表单输入脚本内容，可点击按钮进行加密和解密操作，并给出了加密时的注意事项。

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<html>
<head>
<title>Encode加密解密</title>
<script language="javascript">
<!--
function screncode(s,l)
{enc=new ActiveXObject("Scripting.Encoder");
return enc.EncodeScriptFile("."+l,s,0,l+"cript");
}

var STATE_COPY_INPUT  = 100
var STATE_READLEN  = 101
var STATE_DECODE  = 102
var STATE_UNESCAPE  = 103

var pick_encoding = new Array(
  1, 2, 0, 1, 2, 0, 2, 0, 0, 2, 0, 2, 1, 0, 2, 0,
  1, 0, 2, 0, 1, 1, 2, 0, 0, 2, 1, 0, 2, 0, 0, 2,
  1, 1, 0, 2, 0, 2, 0, 1, 0, 1, 1, 2, 0, 1, 0, 2,
  1, 0, 2, 0, 1, 1, 2, 0, 0, 1, 1, 2, 0, 1, 0, 2
)

var rawData = new Array(
  0x64,0x37,0x69, 0x50,0x7E,0x2C, 0x22,0x5A,0x65, 0x4A,0x45,0x72,
  0x61,0x3A,0x5B, 0x5E,0x79,0x66, 0x5D,0x59,0x75, 0x5B,0x27,0x4C,
  0x42,0x76,0x45, 0x60,0x63,0x76, 0x23,0x62,0x2A, 0x65,0x4D,0x43,
  0x5F,0x51,0x33, 0x7E,0x53,0x42, 0x4F,0x52,0x20, 0x52,0x20,0x63,
  0x7A,0x26,0x4A, 0x21,0x54,0x5A, 0x46,0x71,0x38, 0x20,0x2B,0x79,
  0x26,0x66,0x32, 0x63,0x2A,0x57, 0x2A,0x58,0x6C, 0x76,0x7F,0x2B,
  0x47,0x7B,0x46, 0x25,0x30,0x52, 0x2C,0x31,0x4F, 0x29,0x6C,0x3D,
  0x69,0x49,0x70, 0x3F,0x3F,0x3F, 0x27,0x78,0x7B, 0x3F,0x3F,0x3F,
  0x67,0x5F,0x51, 0x3F,0x3F,0x3F, 0x62,0x29,0x7A, 0x41,0x24,0x7E,
  0x5A,0x2F,0x3B, 0x66,0x39,0x47, 0x32,0x33,0x41, 0x73,0x6F,0x77,
  0x4D,0x21,0x56, 0x43,0x75,0x5F, 0x71,0x28,0x26, 0x39,0x42,0x78,
  0x7C,0x46,0x6E, 0x53,0x4A,0x64, 0x48,0x5C,0x74, 0x31,0x48,0x67,
  0x72,0x36,0x7D, 0x6E,0x4B,0x68, 0x70,0x7D,0x35, 0x49,0x5D,0x22,
  0x3F,0x6A,0x55, 0x4B,0x50,0x3A, 0x6A,0x69,0x60, 0x2E,0x23,0x6A,
  0x7F,0x09,0x71, 0x28,0x70,0x6F, 0x35,0x65,0x49, 0x7D,0x74,0x5C,
  0x24,0x2C,0x5D, 0x2D,0x77,0x27, 0x54,0x44,0x59, 0x37,0x3F,0x25,
  0x7B,0x6D,0x7C, 0x3D,0x7C,0x23, 0x6C,0x43,0x6D, 0x34,0x38,0x28,
  0x6D,0x5E,0x31, 0x4E,0x5B,0x39, 0x2B,0x6E,0x7F, 0x30,0x57,0x36,
  0x6F,0x4C,0x54, 0x74,0x34,0x34, 0x6B,0x72,0x62, 0x4C,0x25,0x4E,
  0x33,0x56,0x30, 0x56,0x73,0x5E, 0x3A,0x68,0x73, 0x78,0x55,0x09,
  0x57,0x47,0x4B, 0x77,0x32,0x61, 0x3B,0x35,0x24, 0x44,0x2E,0x4D,
  0x2F,0x64,0x6B, 0x59,0x4F,0x44, 0x45,0x3B,0x21, 0x5C,0x2D,0x37,
  0x68,0x41,0x53, 0x36,0x61,0x58, 0x58,0x7A,0x48, 0x79,0x22,0x2E,
  0x09,0x60,0x50, 0x75,0x6B,0x2D, 0x38,0x4E,0x29, 0x55,0x3D,0x3F
)

var transformed = new Array()
for (var i=0; i<3; i++) transformed[i] = new Array()
for (var i=31; i<=126; i++) for (var j=0; j<3; j++) transformed[j][rawData[(i-31) * 3 + j]] = (i==31) ? 9 : i

var digits = new Array()
for (var i=0; i<26; i++)
{
digits["A".charCodeAt(0)+i] = i
digits["a".charCodeAt(0)+i] = i+26
}
for (var i=0; i<10; i++) digits["0".charCodeAt(0)+i] = i+52
digits[0x2b] = 62
digits[0x2f] = 63

function unescape(char)
{
var escapes = "#&!*$"
var escaped = "/r/n<>@"

  if (char.charCodeAt(0) > 126) return char
  if (escapes.indexOf(char) != -1) return escaped.substr(escapes.indexOf(char), 1)
  return "?"
}

function decodeBase64(string)
{
  var val = 0
  val += (digits[string.substr(0,1).charCodeAt(0)] << 2)
  val += (digits[string.substr(1,1).charCodeAt(0)] >> 4)
  val += (digits[string.substr(1,1).charCodeAt(0)] & 0xf) << 12
  val += ((digits[string.substr(2,1).charCodeAt(0)] >> 2) << 8)
  val += ((digits[string.substr(2,1).charCodeAt(0)] & 0x3) << 22)
  val += (digits[string.substr(3,1).charCodeAt(0)] << 16)
  return val
}

function strdec(encodingString)
{

  var marker = "#@~^"
  var stringIndex = 0
  var scriptIndex = -1
  var unEncodingIndex = 0
  var char = null
  var encodingLength = unEncodinglength = 0
  var state = STATE_COPY_INPUT
  var unEncodingString = ""
  var re, arr

  while(state)
  {
   switch (state)
   {
    case (STATE_COPY_INPUT) :
     scriptIndex = encodingString.indexOf(marker, stringIndex)
     if (scriptIndex != -1)
     {
      unEncodingString += encodingString.substring(stringIndex, scriptIndex)
      scriptIndex += marker.length
      state = STATE_READLEN
     }
     else
     {
      stringIndex = stringIndex==0 ? 0 : stringIndex
      unEncodingString += encodingString.substr(stringIndex, encodingString.length)
      state = 0
     }
     break

    case (STATE_READLEN) :
     encodingLength = encodingString.substr(scriptIndex, 6)
     unEncodinglength = decodeBase64(encodingLength)
     scriptIndex += (6 + "==".length)
     state = STATE_DECODE
     break

    case (STATE_DECODE) :
     if (!unEncodinglength)
     {
      stringIndex = scriptIndex + "DQgAAA==^#~@".length
      unEncodingIndex = 0
      state = STATE_COPY_INPUT
      break
     }
     char = encodingString.substr(scriptIndex, 1)
     if (char == "@") state = STATE_UNESCAPE
     else
     {
      if (char.charCodeAt(0) < 0xFF)
      {
       unEncodingString += String.fromCharCode(transformed[pick_encoding[unEncodingIndex%64]][char.charCodeAt(0)])
       unEncodingIndex++
      }
      else
      {
       unEncodingString += char
      }
      scriptIndex++
      unEncodinglength--
      break
     }

    case STATE_UNESCAPE:
     unEncodingString += unescape(encodingString.substr(++scriptIndex, 1))
     scriptIndex++; unEncodinglength -=2
     unEncodingIndex++
     state = STATE_DECODE
     break
   }
  }

  re = new RegExp("(JScript|VBscript).encode", "gmi")
  while(arr = re.exec(unEncodingString)) unEncodingString = RegExp.leftContext + RegExp.$1 + RegExp.rightContext
  return unEncodingString
}

//-->
</script>
</head>
<body>
<div align=center>
<span>脚本加密与解密</span>
<FORM METHOD="post">
<textarea name="codeinput" cols="70" rows="20"></textarea><br><br>
<input type="button" value="Encode加密" onclick="this.form.codeinput.value=screncode(this.form.codeinput.value,'JS')"> <input type="button" value="Encode解密" onclick="this.form.codeinput.value=strdec(this.form.codeinput.value)"> <br>
<p style="width:100%;padding:0 40px;text-align:left">说明：加密时应只加密脚本部分，不加密脚本标记<script language="javascript">，并且加密后脚本标记应改为：<script language="JScript.Encode"></p>
</form>
</div>
<br>
</body>
</html>