AsymmetricAlgorithmEncryptor.cs
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace APress.DotNetSecurity.Chapter2.AsymmetricAlgorithmEncryptor
{
class AsymmetricAlgorithmEncryptorTester
{
static void Main(string[] args)
{
try
{
String adPath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
Console.WriteLine("Creating the random data file information...");
RandomNumberGenerator rng = new RNGCryptoServiceProvider();
byte[] randomBytes = new byte[1000];
rng.GetNonZeroBytes(randomBytes);
FileStream fCreate = new FileStream(adPath + @"\randomData.dat",
FileMode.Create, FileAccess.Write);
Console.WriteLine("Writing the random data to the file " +
adPath + @"\randomData.dat...");
fCreate.Write(randomBytes, 0, (int)randomBytes.Length);
fCreate.Close();
FileStream fin = new FileStream(adPath + @"\randomData.dat",
FileMode.Open, FileAccess.Read);
FileStream fdec = new FileStream(adPath + @"\randomDataOut.dat",
FileMode.OpenOrCreate, FileAccess.Write);
// Read in the file data.
RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)RSA.Create();
int len = 0, readBytes = 0, dataSize = 0;
if(1024 == rsa.KeySize)
{
dataSize = 16;
}
else
{
dataSize = 5;
}
Console.WriteLine("Data length is " + dataSize.ToString());
byte[] finData = new byte[dataSize], rsaEncrypt = null,
rsaDecrypt = null;
Console.WriteLine("Encrypting the data and decrypting the data to " +
adPath + @"\randomDataOut.dat...");
while(readBytes < fin.Length)
{
len = fin.Read(finData, 0, dataSize);
readBytes += len;
// Encrypt the data.
rsaEncrypt = rsa.Encrypt(finData, false);
// Decrypt the data.
rsaDecrypt = rsa.Decrypt(rsaEncrypt, false);
fdec.Write(rsaDecrypt, 0, (int)rsaDecrypt.Length);
}
fdec.Close();
}
catch(CryptographicUnexpectedOperationException cuoe)
{
Console.WriteLine("CryptographicUnexpectedOperationException: "
+ cuoe.Message);
Console.WriteLine(cuoe.StackTrace);
}
catch(CryptographicException ce)
{
Console.WriteLine("CryptographicException: " + ce.Message);
Console.WriteLine(ce.StackTrace);
}
catch(Exception ge)
{
Console.WriteLine("Exception: " + ge.GetType().Name + " " + ge.Message);
Console.WriteLine(ge.StackTrace);
}
finally
{
Console.WriteLine("Press the return key to continue...");
Console.Read();
}
}
private static String ArrayToHexString(byte[] ByteData)
{
StringBuilder retVal = new StringBuilder();
foreach(byte b in ByteData)
{
retVal.Append(b);
retVal.Append(" ");
}
retVal.Remove(retVal.Length - 1, 1);
return retVal.ToString();
}
}
}