Encryption in Windows 98

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grip003

Regular
Joined
Sep 2, 2004
Messages
89
Location
North Carolina
I wrote a simple encryption class to handle encrypting strings and byte arrays. Everything works perfectly in Windows XP and Windows 2000, but I get the following error in Windows 98:

Byte array is too large. The maximum size byte array that can be encrypted by this public key implementation is 16 bytes.

I am getting this error in the following code
Code: 
public static byte[] RSAEncrypt(byte[] DataToEncrypt,
	string key_file)
{
	// Encryption is done using the public key.
	try
	{
		System.Windows.Forms.MessageBox.Show("Creating " +
			"RSACryptoServiceProvider.");
		// Create a new instance of RSACryptoServiceProvider
		RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

		// Import the RSA Key information, which only needs to
		//  include the public key information.
		System.IO.FileStream reader = new System.IO.FileStream(
			key_file, System.IO.FileMode.Open, System.IO.FileAccess.Read);
		System.Xml.XmlTextReader xml_reader =
			new System.Xml.XmlTextReader(reader);
		System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
		doc.Load(xml_reader);
		xml_reader.Close();
		reader.Close();
			
		RSA.FromXmlString(doc.InnerXml);
				
		// By default this will create a 128 bit AES object
		SymmetricAlgorithm sa = SymmetricAlgorithm.Create();
		ICryptoTransform ct = sa.CreateEncryptor();
		byte[] encrypt = ct.TransformFinalBlock(
			DataToEncrypt, 0, DataToEncrypt.Length);

		RSAPKCS1KeyExchangeFormatter fmt = new RSAPKCS1KeyExchangeFormatter(RSA);
		byte[] keyex = fmt.CreateKeyExchange(sa.Key);

		// return the key exchange, the IV (public) and encrypted data
		byte[] result = new byte [keyex.Length + sa.IV.Length + encrypt.Length];
		Buffer.BlockCopy(keyex, 0, result, 0, keyex.Length);
		Buffer.BlockCopy(sa.IV, 0, result, keyex.Length, sa.IV.Length);
		Buffer.BlockCopy(encrypt, 0, result, keyex.Length + sa.IV.Length,
			encrypt.Length);
		return result;
	}
	catch (Exception ex)
	{
		System.Windows.Forms.MessageBox.Show("Exception!!\n" +
			ex.Message);
		return null;
	}
}// end RSAEncrypt(byte[] DataToEncrypt, string key_file)

The error comes on line byte[] keyex = fmt.CreateKeyExchange(sa.Key);
I have I.E. 6.0 installed on the 98 machine, which should include the strong encryption that I need, at least that's what I've heard. Can anyone help me out here?
 
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