def recvClientRandom(self, s): """ @summary: receive client random and generate session keys @param s: {Stream} """ #packet preambule securityFlag = UInt16Le() securityFlagHi = UInt16Le() s.readType((securityFlag, securityFlagHi)) if not (securityFlag.value & SecurityFlag.SEC_EXCHANGE_PKT): raise InvalidExpectedDataException("waiting client random") message = ClientSecurityExchangePDU() s.readType(message) clientRandom = rsa.decrypt(message.encryptedClientRandom.value[::-1], self._rsaPrivateKey)[::-1] self._macKey, self._initialEncryptKey, self._initialDecrytKey = generateKeys( clientRandom, self.getGCCServerSettings().SC_SECURITY.serverRandom.value, self.getGCCServerSettings().SC_SECURITY.encryptionMethod.value) #initialize keys self._currentDecrytKey = self._initialDecrytKey self._currentEncryptKey = self._initialEncryptKey self._decryptRc4 = rc4.RC4Key(self._currentDecrytKey) self._encryptRc4 = rc4.RC4Key(self._currentEncryptKey) self.setNextState(self.recvInfoPkt)
def recvClientRandom(self, s): """ @summary: receive client random and generate session keys @param s: {Stream} """ #packet preambule securityFlag = UInt16Le() securityFlagHi = UInt16Le() s.readType((securityFlag, securityFlagHi)) if not (securityFlag.value & SecurityFlag.SEC_EXCHANGE_PKT): raise InvalidExpectedDataException("waiting client random") message = ClientSecurityExchangePDU() s.readType(message) clientRandom = rsa.decrypt(message.encryptedClientRandom.value[::-1], self._rsaPrivateKey)[::-1] self._macKey, self._initialEncryptKey, self._initialDecrytKey = generateKeys( clientRandom, self.getGCCServerSettings().SC_SECURITY.serverRandom.value, self.getGCCServerSettings().SC_SECURITY.encryptionMethod.value) #initialize keys self._currentDecrytKey = self._initialDecrytKey self._currentEncryptKey = self._initialEncryptKey self._decryptRc4 = rc4.RC4Key(self._currentDecrytKey) self._encryptRc4 = rc4.RC4Key(self._currentEncryptKey) self.setNextState(self.recvInfoPkt)