static void TestSwitchOAEP()
{
// Arrange
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] authKey = new byte[16];
rng.GetBytes(authKey);
byte[] message = new byte[1];
rng.GetBytes(message);
Console.WriteLine("Message was " + Environment.NewLine + ByteArrayToString(message) + " (length=" + message.Length + ")");
SwitchOAEP sc = new SwitchOAEP();
sc.AuthenticationKey = authKey;
// Act
byte[] ciphertext = sc.CreateEncryptor().TransformFinalBlock(message, 0, message.Length);
Console.WriteLine("Ciphertext was ");
Console.WriteLine("Etm: " + ByteArrayToString(ciphertext, 0, 32));
Console.WriteLine("MAC seed: " + ByteArrayToString(ciphertext, 32, 16));
Console.WriteLine("MAC bits: " + ByteArrayToString(ciphertext, 48, 16));
Console.WriteLine("Swapped Encoded Msg: " + ByteArrayToString(ciphertext, 64, ciphertext.Length - 64));
Console.WriteLine("Ciphertext length: " + ciphertext.Length);
byte[] plaintext = sc.CreateDecryptor().TransformFinalBlock(ciphertext, 0, ciphertext.Length);
Console.WriteLine("Plantext was" + Environment.NewLine + ByteArrayToString(plaintext) + " (length=" + plaintext.Length + ")");
bool equal = plaintext.SequenceEqual(message);
Console.WriteLine(Environment.NewLine + "Plaintext " + (equal ? "was" : "was NOT") + " equal to the message");
}
static void ProduceLengthCSVFile()
{
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
SwitchOAEP sc = new SwitchOAEP();
AesManaged aes128 = new AesManaged();
aes128.KeySize = 128;
aes128.BlockSize = 128;
aes128.GenerateIV();
aes128.GenerateKey();
RijndaelManaged rijndael256 = new RijndaelManaged();
rijndael256.KeySize = 256;
rijndael256.BlockSize = 256;
rijndael256.GenerateIV();
rijndael256.GenerateKey();
//int[] lengths = new int[] { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 };
//int[] lengths = new int[] { 10, 100, 1000, 10000, 100000, 1000000, 1000001 };
int x = 256;
int[] lengths = new int[] { x - 1, x, x + 1, x + 2, x + 3, x + 4, x + 5, x + 6, x + 7, x + 8, x + 9, x + 10, x + 11, x + 12, x + 13, x + 14, x + 15, x + 16 };
string SwitchOAEPInputOutputLengths = "Message Length, SwitchOAEP Ciphertext Length, AES128 Ciphertext Length, RIJ256 Ciphertext Length" + Environment.NewLine;
for (int i = 0; i < lengths.Length; i++)
{
// Create message of appropriate length
byte[] message = new byte[lengths[i]];
rng.GetBytes(message);
byte[] ciphertextSwitchOAEP = sc.CreateEncryptor().TransformFinalBlock(message, 0, message.Length);
byte[] ciphertextAes128 = aes128.CreateEncryptor().TransformFinalBlock(message, 0, message.Length);
byte[] ciphertextAes256 = rijndael256.CreateEncryptor().TransformFinalBlock(message, 0, message.Length);
string output = message.Length + "," + ciphertextSwitchOAEP.Length + "," + (aes128.IV.Length + ciphertextAes128.Length + 32) + "," + (rijndael256.IV.Length + ciphertextAes256.Length + 32);
Console.WriteLine(output);
SwitchOAEPInputOutputLengths += output + Environment.NewLine;
}
File.WriteAllText("CipherLengths.csv", SwitchOAEPInputOutputLengths);
}
private void EncryptDecryptMsgLengthTest(int messageLength)
{
// Arrange
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
SwitchOAEP sc = new SwitchOAEP();
byte[] authKey = new byte[16];
rng.GetBytes(authKey);
byte[] message = new byte[messageLength];
rng.GetBytes(message);
sc.AuthenticationKey = authKey;
// Act
byte[] ciphertext = new byte[0];
byte[] plaintext = new byte[0];
try
{
// Act
ciphertext = sc.CreateEncryptor().TransformFinalBlock(message, 0, message.Length);
plaintext = sc.CreateDecryptor().TransformFinalBlock(ciphertext, 0, ciphertext.Length);
// Assert
CollectionAssert.AreEqual(message, plaintext,
"Message was " + Environment.NewLine + Helper.ByteArrayToString(message) + " (length=" + message.Length + ")" +
Environment.NewLine + "Ciphertext was " + Environment.NewLine + Helper.ByteArrayToString(ciphertext) + " (length=" + ciphertext.Length + ")" +
Environment.NewLine + "Plantext was" + Environment.NewLine + Helper.ByteArrayToString(plaintext) + " (length=" + plaintext.Length + ")");
}
catch (Exception e)
{
Assert.Fail("Exception: " + e.ToString() + Environment.NewLine +
"Message was " + Environment.NewLine + Helper.ByteArrayToString(message) + " (length=" + message.Length + ")" +
Environment.NewLine + "Ciphertext was " + Environment.NewLine + Helper.ByteArrayToString(ciphertext) + " (length=" + ciphertext.Length + ")" +
Environment.NewLine + "Plantext was" + Environment.NewLine + Helper.ByteArrayToString(plaintext) + " (length=" + plaintext.Length + ")");
}
}
