def encryptAndHMAC( self, crypter, HMACKey ):
encrypted = crypter.encrypt(serialize.htons(self.totalLen) + \
serialize.htons(self.payloadLen) + self.payload + \
(self.totalLen - self.payloadLen) * '\0')
hmac = mycrypto.MyHMAC_SHA256_128(HMACKey, encrypted)
return hmac + encrypted
def encryptAndHMAC(self, crypter, HMACKey):
encrypted = crypter.encrypt(serialize.htons(self.totalLen) + \
serialize.htons(self.payloadLen) + self.payload + \
(self.totalLen - self.payloadLen) * '\0')
hmac = mycrypto.MyHMAC_SHA256_128(HMACKey, encrypted)
return hmac + encrypted
def __str__(self):
"""Return string representation of the message."""
totalLenStr = pack.htons(self.totalLen)
payloadLenStr = pack.htons(self.payloadLen)
flagsStr = chr(self.flags)
headerStr = totalLenStr + payloadLenStr + flagsStr
if isControl(self):
opCodeStr = chr(self.opcode)
argsLenStr = pack.htons(self.argsLen)
headerStr += opCodeStr + argsLenStr
paddingStr = self.generatePadding()
payloadStr = self.args + self.payload + paddingStr
return headerStr + payloadStr
def __str__(self):
"""Return string representation of the message."""
totalLenStr = pack.htons(self.totalLen)
payloadLenStr = pack.htons(self.payloadLen)
flagsStr = chr(self.flags)
headerStr = totalLenStr + payloadLenStr + flagsStr
if isControl(self):
opCodeStr = chr(self.opcode)
argsLenStr = pack.htons(self.argsLen)
headerStr += opCodeStr + argsLenStr
paddingStr = self.generatePadding()
payloadStr = self.args + self.payload + paddingStr
return headerStr + payloadStr
def encryptAndHMAC( self, crypter, hmacKey ):
"""
Encrypt and authenticate this protocol message.
This protocol message is encrypted using `crypter' and authenticated
using `hmacKey'. Finally, the encrypted message prepended by a
HMAC-SHA256-128 is returned and ready to be sent over the wire.
"""
encrypted = crypter.encrypt(pack.htons(self.totalLen) +
pack.htons(self.payloadLen) +
chr(self.flags) + self.payload +
(self.totalLen - self.payloadLen) * '\0')
hmac = mycrypto.HMAC_SHA256_128(hmacKey, encrypted)
return hmac + encrypted
def encryptAndHMAC(self, crypter, hmacKey):
"""
Encrypt and authenticate this protocol message.
This protocol message is encrypted using `crypter' and authenticated
using `hmacKey'. Finally, the encrypted message prepended by a
HMAC-SHA256-128 is returned and ready to be sent over the wire.
"""
encrypted = crypter.encrypt(
pack.htons(self.totalLen) + pack.htons(self.payloadLen) +
chr(self.flags) + self.payload +
(self.totalLen - self.payloadLen) * '\0')
hmac = mycrypto.HMAC_SHA256_128(hmacKey, encrypted)
return hmac + encrypted
def _write_ext_orport_command(self, command, body):
"""
Serialize 'command' and 'body' to an Extended ORPort command
and send it to the Extended ORPort.
Throws CouldNotWriteExtCommand
"""
payload = ''
if len(body) > 65535: # XXX split instead of quitting?
log.warning("Obfsproxy was asked to send Extended ORPort command with more than "
"65535 bytes of body. This is not supported by the Extended ORPort "
"protocol. Please file a bug.")
raise CouldNotWriteExtCommand("Too large body.")
if command > 65535:
raise CouldNotWriteExtCommand("Not supported command type.")
payload += srlz.htons(command)
payload += srlz.htons(len(body))
payload += body # body might be absent (empty string)
self.write(payload)
