Objective-C Decrepit Data from .Net Application

Hello Experts,

I have data come from .Net Application Via XML format, this Data had been encrypted via .Net function and it must send to IPAD application as it encrypted , I need to know how I can Decrepit this data from Objective-C

The .Net Encryption  Function will be like this

Private key() As Byte = {&H61, &H72, &H84, &H7A, &H24, &H43, &H65, &H64, &H73, &H55, &H64, &H75, &H66}



    Const PASSWORD As String = "TestPassword"

Public Function Encrypt(ByVal sPlainText As String)



        Dim aPlainBytes As Byte()

        Dim aPassword As PasswordDeriveBytes



        aPlainBytes = System.Text.Encoding.Unicode.GetBytes(sPlainText)

        aPassword = New PasswordDeriveBytes(PASSWORD, key)

        Dim sEncryptedData As Byte() = Encrypt(aPlainBytes, aPassword.GetBytes(32), aPassword.GetBytes(16))



        Return Convert.ToBase64String(sEncryptedData)



    End Function



 Private Function Encrypt(ByVal sPlainData As Byte(), ByVal aKey As Byte(), ByVal aIV As Byte()) As Byte()



        Dim oMemoryStream As MemoryStream = New MemoryStream



        Dim oRijndael As Rijndael = Rijndael.Create()

        oRijndael.Key = aKey

        oRijndael.IV = aIV



        Dim oCryptoStream As CryptoStream = New CryptoStream(oMemoryStream, oRijndael.CreateEncryptor(), CryptoStreamMode.Write)

        oCryptoStream.Write(sPlainData, 0, sPlainData.Length)

        oCryptoStream.Close()

        Dim aEncryptedData As Byte() = oMemoryStream.ToArray()



        Return aEncryptedData



    End Function

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Help me Please