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)