public EncryptionContext(Connection conn, AES aes)
: this(conn)
{
this.aes = aes;
}
void PerformEncryptionHandshakeServer()
{
rsa = Security.KeyProvider.GetRSA();
// Send Public Modulus and Exponent
Connection.WriteRaw(rsa.PublicKey);
Connection.WriteRaw(rsa.Exponent);
// Receive 64 bytes (padded to RSA key size) containing AES Key and Ivec
byte[] answer = new byte[Security.RSA.KeySize];
Connection.GetRaw(answer);
byte[] decryptedKeyInfo;
try
{
decryptedKeyInfo = rsa.Decrypt(answer);
}
catch (CryptographicException)
{
throw new InvalidHandshakeException(InvalidHandshakeException.HandshakePhase.EncryptionChannelTest);
}
byte[] aeskey = decryptedKeyInfo.Take(Security.AES.KeySize).ToArray();
byte[] aesivec = decryptedKeyInfo.Skip(Security.AES.KeySize).Take(Security.AES.BlockSize).ToArray();
aes = new Security.AES(aeskey, aesivec);
}
public EncryptionContext(Connection conn, byte[] aesKey, byte[] aesIvec)
: this(conn)
{
aes = new Security.AES(aesKey, aesIvec);
}
void PerformEncryptionHandshakeClient()
{
byte[] pubkey = new byte[Security.RSA.KeySize];
byte[] exponent = new byte[Security.RSA.ExponentSize];
Connection.GetRaw(pubkey);
Connection.GetRaw(exponent);
rsa = new Security.RSA(pubkey, exponent);
aes = Security.KeyProvider.GetAES();
byte[] aesAndIV = new byte[Security.AES.KeySize + Security.AES.BlockSize];
Array.Copy(aes.aesKey, 0, aesAndIV, 0, Security.AES.KeySize);
Array.Copy(aes.aesIV, 0, aesAndIV, Security.AES.KeySize, Security.AES.BlockSize);
Connection.WriteRaw(rsa.Encrypt(aesAndIV));
}
