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190
Destination.py
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190
Destination.py
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import base64
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from cryptography.fernet import Fernet
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.asymmetric import rsa
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from cryptography.hazmat.primitives.asymmetric import padding
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class Destination:
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SINGLE = 0x01;
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GROUP = 0x02;
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PLAIN = 0x03;
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types = [SINGLE, GROUP, PLAIN]
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IN = 0x11;
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OUT = 0x12;
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directions = [IN, OUT]
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@staticmethod
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def getDestinationName(app_name, *aspects):
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# Check input values and build name string
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if "." in app_name: raise ValueError("Dots can't be used in app names")
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name = app_name
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for aspect in aspects:
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if "." in aspect: raise ValueError("Dots can't be used in aspects")
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name = name + "." + aspect
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return name
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@staticmethod
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def getDestinationHash(app_name, *aspects):
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name = Destination.getDestinationName(app_name, *aspects)
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# Create a digest for the destination
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digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
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digest.update(name)
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return digest.finalize()[:10]
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def __init__(self, direction, type, app_name, *aspects):
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# Check input values and build name string
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if "." in app_name: raise ValueError("Dots can't be used in app names")
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if not type in Destination.types: raise ValueError("Unknown destination type")
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if not direction in Destination.directions: raise ValueError("Unknown destination direction")
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self.type = type
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self.direction = direction
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self.name = Destination.getDestinationName(app_name, *aspects)
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self.hash = Destination.getDestinationHash(app_name, *aspects)
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self.hexhash = self.hash.encode("hex_codec")
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self.callback = None
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# Initialize keys to none
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self.prv = None
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self.pub = None
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self.prv_bytes = None
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self.pub_bytes = None
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def __str__(self):
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return "<"+self.name+"/"+self.hexhash+">"
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def setCallback(self, callback):
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self.callback = callback
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def receive(self, data):
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plaintext = self.decrypt(data)
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if plaintext != None and self.callback != None:
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self.callback(plaintext, self)
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def createKey(self):
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if self.type == Destination.PLAIN:
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raise TypeError("A plain destination does not hold any keys")
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if self.type == Destination.SINGLE:
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self.prv = rsa.generate_private_key(
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public_exponent=65337,
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key_size=2048,
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backend=default_backend()
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)
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self.prv_bytes = self.prv.private_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption()
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)
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self.pub = self.prv.public_key()
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self.pub_bytes = self.pub.public_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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if self.type == Destination.GROUP:
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self.prv_bytes = Fernet.generate_key()
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self.prv = Fernet(self.prv_bytes)
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def getKey(self):
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if self.type == Destination.PLAIN:
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raise TypeError("A plain destination does not hold any keys")
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else:
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return self.prv_bytes
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def loadKey(self, key):
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if self.type == Destination.PLAIN:
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raise TypeError("A plain destination does not hold any keys")
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if self.type == Destination.SINGLE:
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self.prv_bytes = key
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self.prv = serialization.load_der_private_key(self.prv_bytes, password=None,backend=default_backend())
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self.pub = self.prv.public_key()
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self.pub_bytes = self.pub.public_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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if self.type == Destination.GROUP:
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self.prv_bytes = key
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self.prv = Fernet(self.prv_bytes)
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def loadPublicKey(self, key):
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if self.type != Destination.SINGLE:
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raise TypeError("Only the \"single\" destination type can hold a public key")
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self.pub_bytes = key
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self.pub = load_der_public_key(self.pub_bytes, backend=default_backend())
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def encrypt(self, plaintext):
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if self.type == Destination.PLAIN:
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return plaintext
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if self.type == Destination.SINGLE and self.prv != None:
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ciphertext = self.pub.encrypt(
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plaintext,
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA1()),
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algorithm=hashes.SHA1(),
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label=None
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)
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)
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return ciphertext
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if self.type == Destination.GROUP and self.prv != None:
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try:
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return base64.urlsafe_b64decode(self.prv.encrypt(plaintext))
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except:
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return None
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def decrypt(self, ciphertext):
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if self.type == Destination.PLAIN:
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return plaintext
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if self.type == Destination.SINGLE and self.prv != None:
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plaintext = self.prv.decrypt(
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ciphertext,
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA1()),
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algorithm=hashes.SHA1(),
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label=None
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)
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)
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return plaintext;
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if self.type == Destination.GROUP:
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return self.prv.decrypt(base64.urlsafe_b64encode(ciphertext))
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def sign(self, message):
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if self.type == Destination.SINGLE and self.prv != None:
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signer = self.prv.signer(
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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signer.update(message)
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return signer.finalize()
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else:
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return None
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24
Packet.py
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24
Packet.py
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import struct
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from Transport import *
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class Packet:
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MTU = 960
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def __init__(self, destination, data):
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self.destination = destination
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self.data = data
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self.flags = 0x00
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self.header = 0x00
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self.raw = None
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self.sent = False
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def send(self):
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self.header = struct.pack("!B", self.header ^ self.destination.type ^ self.flags)
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self.header += self.destination.hash
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self.ciphertext = self.destination.encrypt(self.data)
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self.raw = self.header + self.ciphertext
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if len(self.raw) > Packet.MTU:
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raise IOError("Packet size exceeds MTU of "+Packet.MTU+" bytes")
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Transport.outbound(self.raw)
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4
Transport.py
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4
Transport.py
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class Transport:
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@staticmethod
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def outbound(raw):
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pass
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