Sharing Encrypted (TripleDES) Token between Hosts (PHP & .NET)

Am trying to create an encrypted token that can be shared across hosts but am not having any success..

Both hosts share Initialisation Vector (IV) and secret key (Key) but encrypted secret (Token) is different for both hosts:

Key: cf9f3db8cb4a1095e1ae29a9
IV: ha123PXY
Secret:Let us meet at 9 o'clock at the secret place.
Algo: TripleDES

========================================
Host 1: (Mcrypt Library / PHP / Linux / Apache)
<?PHP
$input = "Let us meet at 9 o'clock at the secret place.";
$td = mcrypt_module_open ('tripledes', '', 'ecb', '');
$iv="ha123PXY";
mcrypt_generic_init ($td, $key, $iv);
$c_t = mcrypt_generic ($td, $input);
mcrypt_module_close ($td);
$token=base64_encode($c_t);
?>

========================================
Host 2: (.NET)
Imports System.Security.Cryptography
Imports System.text
Imports System.io

Public Class _default
Inherits System.Web.UI.Page

Private Key As Byte()
Private IV As Byte()

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub
Protected WithEvents lblTest As System.Web.UI.WebControls.Label

'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
runTest()
End Sub

Private Function runTest()

Dim testResult As New StringBuilder
Dim enc As New System.Text.ASCIIEncoding

Dim plainKeyBytes As Byte() = enc.GetBytes("its_my_secret")
Dim md5KeyBytes As Byte() = md5Hash(plainKeyBytes)

'get hexadecimal string representation of MD5 hash and take
'24 bytes (128 bits) to use as key
Key = enc.GetBytes(System.BitConverter.ToString(md5KeyBy tes).Replace("-", "").ToLower.Substring(0, 24))

IV = enc.GetBytes("ha123PXY")

Dim cryptText As Byte()
Dim plainText As Byte() = enc.GetBytes("Let us meet at 9 o'clock at the secret place.")

cryptText = Encrypt(plainText)

testResult.Append("<b>key:</b> " & enc.GetString(Key) & "<br>")
testResult.Append("<b>IV:</b> " & enc.GetString(IV) & "<br>")
testResult.Append("<b>encrypted ascii:</b> " & enc.GetString(cryptText) & "<br>")
testResult.Append("<b>len:</b> " & cryptText.Length & "<br>")
testResult.Append("<b>base64:</b> " & System.Convert.ToBase64String(cryptText) & "<br>")
testResult.Append("<b>decrypted:</b> " & enc.GetString(DeCrypt(cryptText)))

lblTest.Text = testResult.ToString

End Function

Private Function md5Hash(ByVal data() As Byte) As Byte()
Dim provider As New MD5CryptoServiceProvider
Return provider.ComputeHash(data)
End Function

Private Function Encrypt(ByVal plainText() As Byte) As Byte()
Dim cryptostream As CryptoStream
Dim ms As New System.IO.MemoryStream '-- memory stream to write encrypted data to
Dim tdes As New TripleDESCryptoServiceProvider

Try
'-- create TripleDES Encryptor from this instance
Dim tdesEncrypt As ICryptoTransform = tdes.CreateEncryptor(Key, IV)

'-- create Crypto Stream that transforms memory stream using des encryption
cryptostream = New CryptoStream(ms, tdesEncrypt, CryptoStreamMode.Write)

'-- write out and flush TripleDES encrypted file to memory stream
With cryptostream
.Write(plainText, 0, plainText.Length)
.FlushFinalBlock()
End With

'-- return encrypted data
Return ms.ToArray
Catch e As Exception
Throw e
Finally '-- close streams
If Not (cryptostream Is Nothing) Then cryptostream.Close()
If Not (ms Is Nothing) Then ms.Close()
End Try

End Function

Private Function DeCrypt(ByVal encryptedData() As Byte) As Byte()

Dim ms As System.IO.MemoryStream '-- memory stream to write decrypted data to
Dim cryptostreamDecr As CryptoStream
Dim tdes As New TripleDESCryptoServiceProvider

Try
'-- create TripleDES instance and Decryptor
Dim tdesDecrypt As ICryptoTransform = tdes.CreateDecryptor(Key, IV)

'-- create crypto stream set to read and do a TripleDES decryption transform on incoming bytes
ms = New MemoryStream(encryptedData)
cryptostreamDecr = New CryptoStream(ms, tdesDecrypt, CryptoStreamMode.Read)

'-- get the decrypted bytes
Dim destArr() As Byte = New BinaryReader(cryptostreamDecr).ReadBytes(ms.Length * 2)
Return destArr '-- return decrypted data
Catch e As Exception
Throw e
Finally '-- close streams
If Not (ms Is Nothing) Then ms.Close()

'-- Don't use the following. It gives error "Stream does not support writing
'If Not (cryptostreamDecr Is Nothing) Then cryptostreamDecr.Close()
End Try

End Function

End Class

=========================================
Host 1 Output:

Key: cf9f3db8cb4a1095e1ae29a9
IV: ha123PXY
Secret: Let us meet at 9 o'clock at the secret place.
Encrypted ascii:ÌcLZénMå s#eW Bïd šŸñ–ÝRAƒÆÑ$¤®X/t’Wv8ê‹ÉJÁÙ
len: 48
Base 64: zGNMG1rpbk3lIHMjFmVXDELvZAman/GW3VJBg8bRJKSuWC8YdJJXdjjqi8lKB8HZ
Decrypted: Let us meet at 9 o'clock at the secret place.

=========================================
Host 2 Output:

key: cf9f3db8cb4a1095e1ae29a9
IV: ha123PXY
encrypted ascii: 0tCU-OQH[N- >r$
JrfNk.}g*nLhz^(R@@$WA
len: 48
base64: jTD0Q9Utg09RBkhbAxPOLYw+cqQbG4HKFPJmzmuu/eeq7kyQhuj63ihSwMAkV0Ee
decrypted: Let us meet at 9 o'clock at the secret place.
==========================================

I couldn't find anything in searches where people have tried this before or any suggested approaches..


Any ideas would be greatly appreciated...