static public byte[] Encrypt(byte[] clearText)
{
try
{
if (clearText.Length > 128)
{
throw new ByteSize("String is too large");
}
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);
if (ReadWrite.DoesFileExist(@"..\..\..\Files\public_key.txt") && ReadWrite.DoesFileExist(@"..\..\..\Files\private_keyRSA.txt"))
{
TextReader textReader = new StreamReader(@"..\..\..\Files\public_keyRSA.txt");
string readXMLString = textReader.ReadToEnd();
textReader.Close();
rsa.FromXmlString(readXMLString);
byte[] encryptedText = rsa.Encrypt(clearText, false);
return(encryptedText);
}
else
{
TextWriter textWriter = new StreamWriter(@"..\..\..\Files\public_keyRSA.txt");
string publicKey = rsa.ToXmlString(false);
textWriter.Write(publicKey);
textWriter.Close();
textWriter = new StreamWriter(@"..\..\..\Files\private_keyRSA.txt");
string privateKey = rsa.ToXmlString(true);
textWriter.Write(privateKey);
textWriter.Close();
byte[] encryptedText = rsa.Encrypt(clearText, false);
CFiles.CreateFile("encrypted_Text_RSA");
string encryptedTextInString = System.Convert.ToBase64String(encryptedText);
ReadWrite.WriteToFile(encryptedTextInString, "encrypted_Text_RSA");
return(encryptedText);
}
}
catch (ByteSize e)
{
MessageBox.Show("Lenght of string is to large.");
return(new byte[0]);
}
catch (Exception)
{
MessageBox.Show("Generic error!");
return(new byte[0]);
}
}