private void RunEncryptionUsingTripleDES()
{
Console.WriteLine("Encryption Using Triple DES started");
Console.WriteLine();
CryptographyExample cryptographyExample = new CryptographyExample(8);
// we are using 24 bytes to make use of the tripple key variants of triple DES
// 24 bytes represents three 64 bit keys or three 8 byte keys
// under the covers our data will be encrypted with key1, then with key2, then with key3
byte[] key = cryptographyExample.GenerateRandomNumber(24);
// we could just send in 16 bytes and it will still work fine, however this means that
// under the covers our data will get encrypted using the first key, then encrypted again using the 2nd key, then once more
// using the first key again.
//byte[] key = cryptographyExample.GenerateRandomNumber(16);
byte[] initializationVector = cryptographyExample.GenerateRandomNumber(8);
const string originalMessage = "Text To Encrypt";
Console.WriteLine(String.Format("Message before encryption: {0}", originalMessage));
byte[] encryptedMessage = cryptographyExample.EncryptUsingTripleDES(Encoding.UTF8.GetBytes(originalMessage), key, initializationVector);
Console.WriteLine(String.Format("Message after encryption: {0}", Encoding.UTF8.GetString(encryptedMessage)));
byte[] decryptedMessage = cryptographyExample.DecryptUsingTripleDES(encryptedMessage, key, initializationVector);
Console.WriteLine(String.Format("Message after decryption: {0}", Encoding.UTF8.GetString(decryptedMessage)));
Console.WriteLine();
Console.WriteLine("Encryption Using Triple DES ended");
}
private void RunEncryptionUsingAES()
{
Console.WriteLine("Encryption Using AES started");
Console.WriteLine();
CryptographyExample cryptographyExample = new CryptographyExample();
// here we are creating a key that is 32 bytes in length or 256 bits, which is the max size of an AES key
byte[] key = cryptographyExample.GenerateRandomNumber(32);
// AES using a 16 byte Initialization Vector
byte[] initializationVector = cryptographyExample.GenerateRandomNumber(16);
const string originalMessage = "Text To Encrypt";
Console.WriteLine(String.Format("Message before encryption: {0}", originalMessage));
byte[] encryptedMessage = cryptographyExample.EncryptUsingAES(Encoding.UTF8.GetBytes(originalMessage), key, initializationVector);
Console.WriteLine(String.Format("Message after encryption: {0}", Encoding.UTF8.GetString(encryptedMessage)));
byte[] decryptedMessage = cryptographyExample.DecryptUsingAES(encryptedMessage, key, initializationVector);
Console.WriteLine(String.Format("Message after decryption: {0}", Encoding.UTF8.GetString(decryptedMessage)));
Console.WriteLine();
Console.WriteLine("Encryption Using AES ended");
}
private void RunEncryptionUsingDES()
{
Console.WriteLine("Encryption Using DES started");
Console.WriteLine();
CryptographyExample cryptographyExample = new CryptographyExample(8);
byte[] key = cryptographyExample.GenerateRandomNumber();
byte[] initializationVector = cryptographyExample.GenerateRandomNumber();
const string originalMessage = "Text To Encrypt";
Console.WriteLine(String.Format("Message before encryption: {0}", originalMessage));
byte[] encryptedMessage = cryptographyExample.EncryptUsingDES(Encoding.UTF8.GetBytes(originalMessage), key, initializationVector);
Console.WriteLine(String.Format("Message after encryption: {0}", Encoding.UTF8.GetString(encryptedMessage)));
byte[] decryptedMessage = cryptographyExample.DecryptUsingDES(encryptedMessage, key, initializationVector);
Console.WriteLine(String.Format("Message after decryption: {0}", Encoding.UTF8.GetString(decryptedMessage)));
Console.WriteLine();
Console.WriteLine("Encryption Using DES ended");
}
public EncryptedPacket EncryptData(byte[] originalMessage, RsaWithRsaParameterKey rsaParams)
{
// Sender generates AES session key
byte[] sessionKey = _cryptographyExample.GenerateRandomNumber(32);
// Sender generates Initialization Vector
byte[] initializationVector = _cryptographyExample.GenerateRandomNumber(16);
// Sender stores that IV in the packet object
EncryptedPacket EP = new EncryptedPacket
{
IV = initializationVector
};
// Sender encrypts data using AES
EP.EncryptedData = _cryptographyExample.EncryptUsingAES(originalMessage, sessionKey, EP.IV);
//Sender encrypts the session key with RSA
EP.EncryptedSessionKey = rsaParams.EncryptData(sessionKey);
return(EP);
}
private void RunRNGCryptoServiceRandomNumbersExample()
{
Console.WriteLine("RNGCryptoService Simple Random Numbers started");
Console.WriteLine();
CryptographyExample CE = new CryptographyExample(32);
for (int index = 1; index < 11; index++)
{
Console.WriteLine(String.Format("Random Number {0}: {1}", index, Convert.ToBase64String(CE.GenerateRandomNumber())));
//check the console readout for this comment:
//The final '==' sequence indicates that the last group contained only one byte, and '=' indicates that it contained two bytes.
}
Console.WriteLine();
Console.WriteLine("RNGCryptoService Simple Random Numbers complete");
}
