Method SendEncryptionKeyResponse

Tools/ProtoProxy/Connection.cpp:2861–2903

void cConnection::SendEncryptionKeyResponse(const AString & a_ServerPublicKey, const AString & a_Nonce)
{
	// Generate the shared secret and encrypt using the server's public key
	Byte SharedSecret[16];
	Byte EncryptedSecret[128];
	memset(SharedSecret, 0, sizeof(SharedSecret));  // Use all zeroes for the initial secret
	cPublicKey PubKey(a_ServerPublicKey);
	int res = PubKey.Encrypt(SharedSecret, sizeof(SharedSecret), EncryptedSecret, sizeof(EncryptedSecret));
	if (res < 0)
	{
		Log("Shared secret encryption failed: %d (0x%x)", res, res);
		return;
	}

	m_ServerEncryptor.Init(SharedSecret, SharedSecret);
	m_ServerDecryptor.Init(SharedSecret, SharedSecret);
	
	// Encrypt the nonce:
	Byte EncryptedNonce[128];
	res = PubKey.Encrypt((const Byte *)a_Nonce.data(), a_Nonce.size(), EncryptedNonce, sizeof(EncryptedNonce));
	if (res < 0)
	{
		Log("Nonce encryption failed: %d (0x%x)", res, res);
		return;
	}
	
	// Send the packet to the server:
	Log("Sending PACKET_ENCRYPTION_KEY_RESPONSE to the SERVER");
	cByteBuffer ToServer(1024);
	ToServer.WriteByte(0x01);  // To server: Encryption key response
	ToServer.WriteBEShort((short)sizeof(EncryptedSecret));
	ToServer.WriteBuf(EncryptedSecret, sizeof(EncryptedSecret));
	ToServer.WriteBEShort((short)sizeof(EncryptedNonce));
	ToServer.WriteBuf(EncryptedNonce, sizeof(EncryptedNonce));
	DataLog(EncryptedSecret, sizeof(EncryptedSecret), "Encrypted secret (%u bytes)", (unsigned)sizeof(EncryptedSecret));
	DataLog(EncryptedNonce,  sizeof(EncryptedNonce),  "Encrypted nonce (%u bytes)",  (unsigned)sizeof(EncryptedNonce));
	cByteBuffer Len(5);
	Len.WriteVarInt(ToServer.GetReadableSpace());
	SERVERSEND(Len);
	SERVERSEND(ToServer);
	m_ServerState = csEncryptedUnderstood;
	m_IsServerEncrypted = true;
}