Question

I have a VBScript script which I would like to run in ASP.NET, is there anyone who can help on rewriting this function in ASP.NET , C# , so that it returns the same algorithm of encryption? This was an ASP.NET Encryption function, converted for Classic ASP usage, but I need to get it working on the ASP.NET code.. How would this code look like in ASP.NET considering its using an ASP.NET Encryption method?

Public Function EncryptAES(ByVal sIn As String, ByVal sKey As String) As String
    Dim AES As New RijndaelManaged
    Dim ahashMD5 As New MD5CryptoServiceProvider()
    AES.Key = ahashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(sKey))
    AES.Mode = CipherMode.ECB
    Dim AESEncrypt As ICryptoTransform = AES.CreateEncryptor()
    Dim aBuffer As Byte() = System.Text.ASCIIEncoding.ASCII.GetBytes(sIn)
    Return Convert.ToBase64String(AESEncrypt.TransformFinalBlock(aBuffer, 0, aBuffer.Length))
End Function

Public Function DecryptAES(ByVal sOut As String, ByVal sKey As String) As String
    Dim dAES As New RijndaelManaged
    Dim dahashMD5 As New MD5CryptoServiceProvider()
    dAES.Key = dahashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(sKey))
    dAES.Mode = CipherMode.ECB
    Dim dAESDecrypt As ICryptoTransform = dAES.CreateDecryptor()
    sOut = Replace(sOut, " ", "+", 1, -1, CompareMethod.Text)
    Dim daBuffer As Byte() = Convert.FromBase64String(sOut)
    Return System.Text.ASCIIEncoding.ASCII.GetString(dAESDecrypt.TransformFinalBlock(daBuffer, 0, daBuffer.Length))
End Function

Answer 1

I have a Classic ASP script

Man, this is pure .NET code. So converting .NET to .NET hardly makes sense.

If you want to convert this VB.NET code to C#, here’s how it would look like:

public string EncryptAES(string sIn, string sKey)
{
    RijndaelManaged AES = new RijndaelManaged();
    MD5CryptoServiceProvider ahashMD5 = new MD5CryptoServiceProvider();
    AES.Key = ahashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(sKey));
    AES.Mode = CipherMode.ECB;
    ICryptoTransform AESEncrypt = AES.CreateEncryptor();
    byte[] aBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(sIn);
    return Convert.ToBase64String(AESEncrypt.TransformFinalBlock(aBuffer, 0, aBuffer.Length));
}

public string DecryptAES(string sOut, string sKey)
{
    RijndaelManaged dAES = new RijndaelManaged();
    MD5CryptoServiceProvider dahashMD5 = new MD5CryptoServiceProvider();
    dAES.Key = dahashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(sKey));
    dAES.Mode = CipherMode.ECB;
    ICryptoTransform dAESDecrypt = dAES.CreateDecryptor();
    sOut = sOut.Replace(" ", "+");
    byte[] daBuffer = Convert.FromBase64String(sOut);
    return System.Text.ASCIIEncoding.ASCII.GetString(dAESDecrypt.TransformFinalBlock(daBuffer, 0, daBuffer.Length));
}