public void SetKeys(TanksCommon.Encryption.EncryptioinKeys key)
{
var aes = new AesCryptoServiceProvider();
var iv = aes.IV;
// Encrypt the session key
RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(key.RsaKey);
var encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, typeof(Aes));
key.SetIvAndSessionKey(iv, encryptedSessionKey);
this._cryptoTransform = aes.CreateEncryptor();
}
public void EncryptDecryptTest()
{
byte[] messageBytes = null;
using (var stream = new System.IO.MemoryStream())
{
var theObject = new TanksCommon.SharedObjects.GameMove()
{
MessageId = 8
};
var messageStream = TanksCommon.MessageEncoder.EncodeMessage(stream, theObject);
messageStream.Seek(0, System.IO.SeekOrigin.Begin);
messageBytes = messageStream.ToArray();
}
//can only encrypt messages, only has public key
TanksCommon.Encryption.EncryptioinKeys clientKey = new TanksCommon.Encryption.EncryptioinKeys();
//can decrypt messages, has public and private key
TanksCommon.Encryption.EncryptioinKeys serverKey = new TanksCommon.Encryption.EncryptioinKeys();
//server provides public RSA keys and client imports them
clientKey.ImportPublicKey(serverKey.ExportPublicKey());
//client can encrypt AES keys with the provided RSA keys
var clientEncryptor = new GameCom.Encrypt(clientKey);
//server sets public AES keys
serverKey.SetIvAndSessionKey(clientKey.Iv, clientKey.SessionKey);
var e1 = clientEncryptor.EncryptBytes(messageBytes);
var d1 = GameCom.Encrypt.DecryptBytes(serverKey, e1);
Assert.IsFalse(messageBytes.SequenceEqual(e1));
Assert.IsTrue(messageBytes.SequenceEqual(d1));
//serverKey.SetIvAndSessionKey(clientKey.Iv, clientKey.SessionKey);
/*var serverEncrypter = new GameCom.Encrypt(serverKey);
*
* var e2 = serverEncrypter.EncryptBytes(messageBytes);
*
* var d2 = GameCom.Encrypt.DecryptBytes(clientKey, e2);
*
* Assert.IsTrue(d2.SequenceEqual(messageBytes));*/
}
public static byte[] DecryptBytes(TanksCommon.Encryption.EncryptioinKeys key, byte[] toDecrypt)
{
byte[] result = null;
using (Aes aes = new AesCryptoServiceProvider())
{
aes.IV = key.Iv;
RSAOAEPKeyExchangeDeformatter keyDeformatter = new RSAOAEPKeyExchangeDeformatter(key.RsaKey);
aes.Key = keyDeformatter.DecryptKeyExchange(key.SessionKey);
// Decrypt the message
using (System.IO.MemoryStream plaintext = new System.IO.MemoryStream())
{
using (CryptoStream cs = new CryptoStream(plaintext, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(toDecrypt, 0, toDecrypt.Length);
cs.Close();
}
plaintext.Close();
result = plaintext.ToArray();
}
}
return(result);
}
public Encrypt(TanksCommon.Encryption.EncryptioinKeys key)
{
SetKeys(key);
}
