asp-classic – 如何使用AES在VBScript中进行加密？

asp.Net 2019-05-27
我正在使用 VBScript中的 Rijndael/AES使用特定的键和 IV值加密一些数据.有没有什么好的函数库或COM组件可以很好的使用？

我看着CAPICOM;它只允许一个密码短语,并且不允许设置特定的键和IV值.

解决方法

一个响应建议将RijndaelManaged类包装在COM中.您还可以在COM中包装其他AES实现.我刚刚尝试了 SlowAES,这是AES的JavaScript实现.通过Windows脚本组件将其包装在COM中可以从VBScript调用.我只会在不能使用.NET方法时推荐这个;我猜想AES的.NET将比在JavaScript中实现的AES更快.

在我对COM-wrapped-SlowAEs的测试中,我使用CBC模式,加密与.NET中的RijndaelManaged类完全兼容.

这是WSC;我省略了SlowAES提供的3个.js文件.您需要在我标记文件时不变地插入它们.

<?xml version="1.0"?>

<!--

//
// Ionic.COM.SlowAES.wsc
//
// This is a Windows Script Component that exposes the SlowAES
// encryption engine via COM. This AES can be used from any 
// COM-capable environment,including Javascript or VBScript. 
//
//
// This code is licensed under the Microsoft Public License. See the
// accompanying License.txt file for details.
//
// copyright 2009 Dino Chiesa
//

-->

<package>

<component id="Ionic.Com.SlowAES">

  <comment>
SlowAES is a Javascript implementation of AES.  
     See http://code.google.com/p/slowaes.  
This is a COM package for SlowAES.
  </comment>

<?component error="true" debug="true"?>

<registration
  description="WSC Component for SlowAES"
  progid="Ionic.Com.SlowAES"
  version="1.00"
  classid="{ba78383f-1bcc-4df6-9fb9-61cd639ebc94}"
  remotable="False">

  <!-- boilerplate registration/unregistration logic -->
  <script language="VBScript">
  <![CDATA[

strComponent = "Ionic SlowAES"

Function Register
  MsgBox strComponent & " - registered."
End Function

Function Unregister
  MsgBox strComponent & " - unregistered."
End Function

  ]]>
  </script>
</registration>

<public>
  <method name="EncryptString">
<parameter name="plainText"/>
  </method>

  <method name="DecryptBytes">
<parameter name="cipherText"/>
  </method>

  <method name="DecryptBytesToString">
<parameter name="cipherText"/>
  </method>

  <method name="DecryptHexString">
<parameter name="hexStringCipherText"/>
  </method>

  <method name="DecryptCommaDelimitedStringToString">
<parameter name="cipherText"/>
  </method>

  <property name="Key">
  <put/>
  </property>

  <property name="Mode">
  <put/>
  <get/>
  </property>

  <property name="IV">
  <put/>
  <get/>
  </property>

  <property name="KeySize">
  <put/>
  <get/>
  </property>
</public>

<script language="JavaScript">
<![CDATA[

// ...insert slowAES code here... //

// defaults
var _keysize = slowAES.aes.SIZE_128;
var _mode = slowAES.modeOfOperation.CBC;
var _iv = [0,0];
var _key;

/* 
* byteArrayToHexString
* convert a byte array to hex string.
*/
function byteArrayToHexString(a)
{
try { hexcase } catch(e) { hexcase=0; }
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var r= "";
for (var i = 0; i < a.length; i++)
{
    var b  = hex_tab.charat((a[i] >> 4) & 0x0F) + 
    hex_tab.charat(a[i] & 0x0F);
    r+= b;
}
return r;
}

/* 
* hexStringToByteArray
* convert a string of hex byts to a byte array
*/
function hexStringToByteArray(s)
{
var r= Array(s.length/2);
for (var i = 0; i < s.length; i+=2)
{
    r[i/2] = parseInt(s.substr(i,2),16);
}
return r;
}

function EncryptString(plainText)
{
 var bytesToEncrypt = cryptoHelpers.convertStringToByteArray(plainText);
 var result = slowAES.encrypt(bytesToEncrypt,_mode,_key,_keysize,_iv);
return result['cipher'];
}

function DecryptBytesToString(cipherText)
{
var d = DecryptBytes(cipherText);
var s = cryptoHelpers.convertByteArrayToString(d);
s[cipherText.length]= 0;
return s;
}

function DecryptHexString(hexStringCipherText)
{
var cipherText = hexStringToByteArray(hexStringCipherText);
return DecryptBytesToString(cipherText);
}

function DecryptCommaDelimitedStringToString(cipherText)
{
var c = [];
var atoms = cipherText.split(",");
for (i=0; i < atoms.length; i++)
{
    c.push(parseInt(atoms[i],10));
}
var d = DecryptBytes(c);
return cryptoHelpers.convertByteArrayToString(d);
}

function DecryptBytes(cipherText)
{
if (cipherText == undefined) return null;

var originalSize = cipherText.length;

var result = slowAES.decrypt(cipherText,originalSize,_iv);

return result;
}

function put_Key(keyString)
{
  _key = hexStringToByteArray(keyString);
}

function put_KeySize(size)
{
if (size == 128) _keysize = slowAES.aes.keySize.SIZE_128;
else if (size == 192) _keysize = slowAES.aes.keySize.SIZE_192;
else if (size == 256) _keysize = slowAES.aes.keySize.SIZE_256;
else
    throw "Unsupported key size.  Must be one of { 128,192,256 }.";
}

function get_KeySize()
{
if (_keysize == slowAES.aes.keySize.SIZE_128) return 128;
else if (_keysize == slowAES.aes.keySize.SIZE_192) return 192;
else if (_keysize == slowAES.aes.keySize.SIZE_256) return 256;
else return -1;
}

function put_IV(ivString)
{
    _iv = hexStringToByteArray(ivString);
}

function get_IV()
{
return byteArrayToHexString(_iv);
}

function put_Mode(mode)
{
if (mode == "CBC") _mode= slowAES.modeOfOperation.CBC;
else if (mode == "OFB") _mode= slowAES.modeOfOperation.OFB;
else if (mode == "CFB") _mode= slowAES.modeOfOperation.CFB;
else throw "Unsupported mode.  Must be one of {CBC,OFB,CFB}";
}

function get_Mode()
{
if (_mode == slowAES.modeOfOperation.CBC) return "CBC";
if (_mode == slowAES.modeOfOperation.OFB) return "OFB";
if (_mode == slowAES.modeOfOperation.CFB) return "CFB";
return "???";
}

]]>

</script>

</component>

</package>

保存到一个名为SlowAES.wsc的文件.注册“regsvr32 SlowAES.wsc”.
这是一些使用该组件的VBScript代码.

' '
' byteArrayToHexString'
' convert a byte array to hex string.'
' '
Function byteArrayToHexString(a)
Dim r,b,i
r = ""
For i = 0 To UBound(a)
    b = Hex( (a(i) And &HF0) / 16) & Hex(a(i) And &HF)
    r= r & b
Next
byteArrayToHexString= r
End Function

' '
' hexStringToByteArray'
' convert a string of hex byts to a byte array'
' '
Function hexStringToByteArray(s)
Dim r()
ReDim r(Len(s)/2-1)
Dim x
For i = 0 To  Len(s)-2 Step 2
    x= "&H" & Mid(s,i+1,2)
    r(i/2) = CInt(x)
Next
hexStringToByteArray= r
End Function

Function DemoEncryption()
WScript.echo "Testing Ionic.Com.SlowAES..."

WScript.echo "key:              " & byteArrayToHexString(key)
WScript.echo "iv:               " & byteArrayToHexString(iv)
WScript.echo "key length:       " & keyLengthInBytes & " bytes"
WScript.echo "key length:       " & (keyLengthInBytes*8) & " bits"
WScript.echo "plaintext:        " & plaintext
WScript.echo "plaintext.length: " & Len(plaintext)

WScript.echo "instantiate Ionic.Com.SlowAES"
Dim aes
set aes = CreateObject("Ionic.Com.SlowAES")

WScript.echo "keysize"
aes.KeySize = keyLengthInBytes * 8

WScript.echo "key"
aes.Key = byteArrayToHexString(key)

WScript.echo "iv "
aes.IV= byteArrayToHexString(iv)

WScript.echo "mode "
aes.Mode = "CBC"

WScript.echo "encrypting... "
Dim result
result= aes.EncryptString(plaintext)

' result is a comma-separated string '
' if we Eval() on it we convert it to an array '
Dim expr
expr = "Array(" & result & ")" 

result= Eval( expr )

WScript.echo "Cryptotext/Eval: " & byteArrayToHexString(result)
WScript.echo "Cryptotext.length: " & UBound(result)+1

WScript.echo "decrypting... "
Dim decrypted
'The javascript way to do this is to pass the byte array.'
' Like so:'
'    var decrypted = aes.DecryptBytesToString(result);'
' '
'This does not work from VBScript. So,convert to a hexstring,'
'pass the hex string,and then convert back,in the COM component.'
decrypted= aes.DecryptHexString(byteArrayToHexString(result))

WScript.echo "decrypted: " & decrypted
End Function

dim plaintext,iv,key,keyLengthInBytes

plaintext= "Hello. This is a test. of the emergency broadcasting system."
' iv must be a hexstring representation of an array of bytes,length=16'
iv =  hexStringToByteArray("FeedbeefFeedbeefbaadf00dbaadf00d")
' key must be a hexstring representation of an array of bytes,length=16 or 32'
key = hexStringToByteArray("cafebabe0099887766554433221100AA")
keyLengthInBytes= UBound(key)+1

If Err.Number <> 0 Then Err.Clear

Call DemoEncryption

If (Err.Number <> 0) Then WScript.echo("Error: " & Err.Description)

如果您还需要基于密码的密钥导出功能,那么可以抓取the very succint JavaScript code for PBKDF2 here和create another WSC for that,而不会有太多麻烦.

编辑：我做了我所描述的 – 抓住了PBKDF2的源码,并将其整合到了SlowAES的代码中.我还在C#中生成了第二个独立的实现,它使用内置的.NET类库来执行RFC 2898密钥派生和AES加密.

结果是3个测试应用程序,一个在C#中,一个在JavaScript中,另一个在VBScript中.他们都采取同样的论据.它们各自使用符合RFC 2898标准的密钥导出功能.您可以指定密码,salt,IV和明文,以及在PBKDF2中使用的RFC 2898迭代次数.您可以轻松地验证每个测试程序的密文是否相同.也许这个例子对于某人是有用的.

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