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");
}
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);
}
