Xtykutl

I have received a method in VB.net and now it is my task to make the same in PHP.
The code vb.net is:

Public Function AES_Encrypt(ByVal input As String, ByVal salt As String) As String

    Dim AES As New System.Security.Cryptography.RijndaelManaged

    Dim Hash_AES As New System.Security.Cryptography.MD5CryptoServiceProvider

    Dim encrypted As String = ""

    Try

        Dim hash(31) As Byte

        Dim temp As Byte() = Hash_AES.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(salt))

        Array.Copy(temp, 0, hash, 0, 16)

        Array.Copy(temp, 0, hash, 15, 16)

        AES.Key = hash

        AES.Mode = Security.Cryptography.CipherMode.ECB

        Dim DESEncrypter As System.Security.Cryptography.ICryptoTransform = AES.CreateEncryptor

        Dim Buffer As Byte() = System.Text.ASCIIEncoding.ASCII.GetBytes(input)

        encrypted = Convert.ToBase64String(DESEncrypter.TransformFinalBlock(Buffer, 0, Buffer.Length))

        Return encrypted

    Catch ex As Exception

        Debugger.Break()

        Return ""

    End Try

End Function

I have tried a couple of things in PHP but I am stuck.
I think the problem is with the translation with this method: DESEncrypter.TransformFinalBlock.

My PHP code is:

function mc_encrypt($encrypt, $mc_key){

  $passcrypt = (mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $mc_key, $encrypt, MCRYPT_MODE_ECB));

  $encoded = base64_encode($passcrypt);

  return $encoded;

}

The keys are the same in both methods.
So in vb.net AES.Key is equal to the $mc_key in PHP.

Update:
Changed my php code to

function mc_encrypt($encrypt, $mc_key){

    echo $mc_key;

    $passcrypt = (mcrypt_encrypt(MCRYPT_RIJNDAEL_128, base64_decode($mc_key), $encrypt, MCRYPT_MODE_ECB));

    $encoded = base64_encode($passcrypt);

    return $encoded;

}

Now the result in VB.net is

MTbXbSE5J/9yh6EsrgeuNZYffQudFTXW0nTd/X8IOAtpnW971JQlpqF0+B9O/hfW

and in PHP:

MTbXbSE5J/9yh6EsrgeuNZYffQudFTXW0nTd/X8IOAv8342+hhksKR6MVgVeXGWb