Restructed to Identity

FPE/Destination.py

@@ -2,6 +2,7 @@ import base64
 import math
 from Identity import Identity
 from Transport import Transport
+from Packet import Packet
 from cryptography.fernet import Fernet
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.backends import default_backend
@@ -47,7 +48,7 @@ class Destination:
 		return digest.finalize()[:10]
 
 
-	def __init__(self, direction, type, app_name, *aspects):
+	def __init__(self, identity, direction, type, app_name, *aspects):
 		# Check input values and build name string
 		if "." in app_name: raise ValueError("Dots can't be used in app names") 
 		if not type in Destination.types: raise ValueError("Unknown destination type")
@@ -56,18 +57,19 @@ class Destination:
 		self.direction = direction
 		self.mtu = 0
 
+		if identity == None:
+			identity = Identity()
+			identity.createKeys()
+
+		self.identity = identity
+		aspects = aspects+(identity.hexhash,)
+
 		self.name = Destination.getDestinationName(app_name, *aspects)		
 		self.hash = Destination.getDestinationHash(app_name, *aspects)
 		self.hexhash = self.hash.encode("hex_codec")
 
 		self.callback = None
 
-		# Initialize keys to none
-		self.prv = None
-		self.pub = None
-		self.prv_bytes = None
-		self.pub_bytes = None
-
 		Transport.registerDestination(self)
 
 
@@ -85,54 +87,33 @@ class Destination:
 			self.callback(plaintext, self)
 
 
-	def createKey(self):
+	def createKeys(self):
 		if self.type == Destination.PLAIN:
 			raise TypeError("A plain destination does not hold any keys")
 
 		if self.type == Destination.SINGLE:
-			self.prv = rsa.generate_private_key(
+			raise TypeError("A single destination holds keys through an Identity instance")
-				public_exponent=65337,
-				key_size=Destination.KEYSIZE,
-				backend=default_backend()
-			)
-			self.prv_bytes = self.prv.private_bytes(
-				encoding=serialization.Encoding.DER,
-				format=serialization.PrivateFormat.PKCS8,
-				encryption_algorithm=serialization.NoEncryption()
-			)
-			self.pub = self.prv.public_key()
-			self.pub_bytes = self.pub.public_bytes(
-				encoding=serialization.Encoding.DER,
-				format=serialization.PublicFormat.SubjectPublicKeyInfo
-			)
-			print("Keys created, private length is "+str(len(self.prv_bytes)))
-			print("Keys created, public length is "+str(len(self.pub_bytes)))
-			#+", public length is "+str(len(self.pub_bytes))))
 
 		if self.type == Destination.GROUP:
 			self.prv_bytes = Fernet.generate_key()
 			self.prv = Fernet(self.prv_bytes)
 
 
-	def getKey(self):
+	def getPrivateKey(self):
 		if self.type == Destination.PLAIN:
 			raise TypeError("A plain destination does not hold any keys")
+		elif self.type == Destination.SINGLE:
+			raise TypeError("A single destination holds keys through an Identity instance")
 		else:
 			return self.prv_bytes
 
 
-	def loadKey(self, key):
+	def loadPrivateKey(self, key):
 		if self.type == Destination.PLAIN:
 			raise TypeError("A plain destination does not hold any keys")
 
 		if self.type == Destination.SINGLE:
-			self.prv_bytes = key
+			raise TypeError("A single destination holds keys through an Identity instance")
-			self.prv = serialization.load_der_private_key(self.prv_bytes, password=None,backend=default_backend())
-			self.pub = self.prv.public_key()
-			self.pub_bytes = self.pub.public_bytes(
-				encoding=serialization.Encoding.DER,
-				format=serialization.PublicFormat.SubjectPublicKeyInfo
-			)
 
 		if self.type == Destination.GROUP:
 			self.prv_bytes = key
@@ -141,39 +122,16 @@ class Destination:
 	def loadPublicKey(self, key):
 		if self.type != Destination.SINGLE:
 			raise TypeError("Only the \"single\" destination type can hold a public key")
-
+		else:
-		self.pub_bytes = key
+			raise TypeError("A single destination holds keys through an Identity instance")
-		self.pub = load_der_public_key(self.pub_bytes, backend=default_backend())
 
 
 	def encrypt(self, plaintext):
 		if self.type == Destination.PLAIN:
 			return plaintext
 
-		if self.type == Destination.SINGLE and self.prv != None:
+		if self.type == Destination.SINGLE and self.identity != None:
-			chunksize = (Destination.KEYSIZE-Destination.PADDINGSIZE)/8
+			return self.identity.encrypt(plaintext)
-			chunks = int(math.ceil(len(plaintext)/(float(chunksize))))
-			print("Plaintext size is "+str(len(plaintext))+", with "+str(chunks)+" chunks")
-
-			ciphertext = "";
-			for chunk in range(chunks):
-				start = chunk*chunksize
-				end = (chunk+1)*chunksize
-				if (chunk+1)*chunksize > len(plaintext):
-					end = len(plaintext)
-
-				print("Processing chunk "+str(chunk+1)+" of "+str(chunks)+". Starting at "+str(start)+" and stopping at "+str(end)+". The length is "+str(len(plaintext[start:end])))
-				
-				ciphertext += self.pub.encrypt(
-					plaintext[start:end],
-					padding.OAEP(
-						mgf=padding.MGF1(algorithm=hashes.SHA1()),
-						algorithm=hashes.SHA1(),
-						label=None
-					)
-				)
-			print("Plaintext encrypted, ciphertext length is "+str(len(ciphertext))+" bytes.")
-			return ciphertext
 
 		if self.type == Destination.GROUP and self.prv != None:
 			try:
@@ -186,44 +144,21 @@ class Destination:
 		if self.type == Destination.PLAIN:
 			return ciphertext
 
-		if self.type == Destination.SINGLE and self.prv != None:
+		if self.type == Destination.SINGLE and self.identity != None:
-			print("Ciphertext length is "+str(len(ciphertext))+". ")
+			return self.identity.decrypt(ciphertext)
-			chunksize = (Destination.KEYSIZE)/8
-			chunks = int(math.ceil(len(ciphertext)/(float(chunksize))))
-
-			plaintext = "";
-			for chunk in range(chunks):
-				start = chunk*chunksize
-				end = (chunk+1)*chunksize
-				if (chunk+1)*chunksize > len(ciphertext):
-					end = len(ciphertext)
-
-				print("Processing chunk "+str(chunk+1)+" of "+str(chunks)+". Starting at "+str(start)+" and stopping at "+str(end)+". The length is "+str(len(ciphertext[start:end])))
-
-				plaintext += self.prv.decrypt(
-					ciphertext[start:end],
-					padding.OAEP(
-						mgf=padding.MGF1(algorithm=hashes.SHA1()),
-						algorithm=hashes.SHA1(),
-						label=None
-					)
-				)
-			return plaintext;
 
 		if self.type == Destination.GROUP:
 			return self.prv.decrypt(base64.urlsafe_b64encode(ciphertext))
 
 
 	def sign(self, message):
-		if self.type == Destination.SINGLE and self.prv != None:
+		if self.type == Destination.SINGLE and self.identity != None:
-			signer = self.prv.signer(
+			return self.identity.sign(message)
-				padding.PSS(
-					mgf=padding.MGF1(hashes.SHA256()),
-					salt_length=padding.PSS.MAX_LENGTH
-				),
-				hashes.SHA256()
-			)
-			signer.update(message)
-			return signer.finalize()
 		else:
 			return None
+
+
+	# Creates an announce packet for this destination.
+	# Application specific data can be added to the announce.
+	def announce(self,app_data=None):
+		pass

FPE/FlexPE.py

@@ -17,9 +17,14 @@ class FlexPE:
 	configpath   = configdir+"/config"
 
 
-	def __init__(self):
+	def __init__(self,config=None):
-		if os.path.isfile(FlexPE.configpath):
+		if config != None:
-			self.config = ConfigObj(FlexPE.configpath)
+			self.configpath = config
+		else:
+			self.configpath = FlexPE.configpath
+
+		if os.path.isfile(self.configpath):
+			self.config = ConfigObj(self.configpath)
 		else:
 			print("Could not load config file, creating default configuration...")
 			self.createDefaultConfig()

FPE/Identity.py

@@ -1,3 +1,10 @@
+import base64
+import math
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.asymmetric import rsa
+from cryptography.hazmat.primitives.asymmetric import padding
 
 class Identity:
 	# Configure key size
@@ -5,3 +12,141 @@ class Identity:
 
 	# Padding size, not configurable
 	PADDINGSIZE= 336;
+
+	def __init__(self):
+		# Initialize keys to none
+		self.prv = None
+		self.pub = None
+		self.prv_bytes = None
+		self.pub_bytes = None
+		self.hash = None
+		self.hexhash = None
+
+		self.createKeys()
+
+	@staticmethod
+	def getHash(pub_key):
+		digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
+		digest.update(pub_key)
+
+		return digest.finalize()[:10]
+
+	def createKeys(self):
+		self.prv = rsa.generate_private_key(
+			public_exponent=65337,
+			key_size=Identity.KEYSIZE,
+			backend=default_backend()
+		)
+		self.prv_bytes = self.prv.private_bytes(
+			encoding=serialization.Encoding.DER,
+			format=serialization.PrivateFormat.PKCS8,
+			encryption_algorithm=serialization.NoEncryption()
+		)
+		self.pub = self.prv.public_key()
+		self.pub_bytes = self.pub.public_bytes(
+			encoding=serialization.Encoding.DER,
+			format=serialization.PublicFormat.SubjectPublicKeyInfo
+		)
+
+		self.hash = Identity.getHash(self.pub_bytes)
+		self.hexhash = self.hash.encode("hex_codec")
+
+		print("Identity keys created, private length is "+str(len(self.prv_bytes)))
+		print("Identity keys created, public length is "+str(len(self.pub_bytes)))
+
+	def getPrivateKey(self):
+		return self.prv_bytes
+
+	def getPublicKey(self):
+		return self.pub_bytes
+
+	def loadPrivateKey(self, key):
+		self.prv_bytes = key
+		self.prv = serialization.load_der_private_key(self.prv_bytes, password=None,backend=default_backend())
+		self.pub = self.prv.public_key()
+		self.pub_bytes = self.pub.public_bytes(
+			encoding=serialization.Encoding.DER,
+			format=serialization.PublicFormat.SubjectPublicKeyInfo
+		)
+
+	def loadPublicKey(self, key):
+		self.pub_bytes = key
+		self.pub = load_der_public_key(self.pub_bytes, backend=default_backend())
+
+	def saveIdentity(self):
+		pass
+
+	def loadIdentity(self):
+		pass
+
+	def encrypt(self, plaintext):
+		if self.prv != None:
+			chunksize = (Identity.KEYSIZE-Identity.PADDINGSIZE)/8
+			chunks = int(math.ceil(len(plaintext)/(float(chunksize))))
+			print("Plaintext size is "+str(len(plaintext))+", with "+str(chunks)+" chunks")
+
+			ciphertext = "";
+			for chunk in range(chunks):
+				start = chunk*chunksize
+				end = (chunk+1)*chunksize
+				if (chunk+1)*chunksize > len(plaintext):
+					end = len(plaintext)
+
+				print("Processing chunk "+str(chunk+1)+" of "+str(chunks)+". Starting at "+str(start)+" and stopping at "+str(end)+". The length is "+str(len(plaintext[start:end])))
+				
+				ciphertext += self.pub.encrypt(
+					plaintext[start:end],
+					padding.OAEP(
+						mgf=padding.MGF1(algorithm=hashes.SHA1()),
+						algorithm=hashes.SHA1(),
+						label=None
+					)
+				)
+			print("Plaintext encrypted, ciphertext length is "+str(len(ciphertext))+" bytes.")
+			return ciphertext
+		else:
+			raise KeyError("Encryption failed because identity does not hold a private key")
+
+
+	def decrypt(self, ciphertext):
+		if self.prv != None:
+			print("Ciphertext length is "+str(len(ciphertext))+". ")
+			chunksize = (Identity.KEYSIZE)/8
+			chunks = int(math.ceil(len(ciphertext)/(float(chunksize))))
+
+			plaintext = "";
+			for chunk in range(chunks):
+				start = chunk*chunksize
+				end = (chunk+1)*chunksize
+				if (chunk+1)*chunksize > len(ciphertext):
+					end = len(ciphertext)
+
+				print("Processing chunk "+str(chunk+1)+" of "+str(chunks)+". Starting at "+str(start)+" and stopping at "+str(end)+". The length is "+str(len(ciphertext[start:end])))
+
+				plaintext += self.prv.decrypt(
+					ciphertext[start:end],
+					padding.OAEP(
+						mgf=padding.MGF1(algorithm=hashes.SHA1()),
+						algorithm=hashes.SHA1(),
+						label=None
+					)
+				)
+			return plaintext;
+		else:
+			raise KeyError("Decryption failed because identity does not hold a private key")
+
+
+	def sign(self, message):
+		if self.prv != None:
+			signer = self.prv.signer(
+				padding.PSS(
+					mgf=padding.MGF1(hashes.SHA256()),
+					salt_length=padding.PSS.MAX_LENGTH
+				),
+				hashes.SHA256()
+			)
+			signer.update(message)
+			return signer.finalize()
+		else:
+			raise KeyError("Signing failed because identity does not hold a private key")
+

t.py

@@ -3,6 +3,7 @@
 # from FPE import FlexPE
 from FPE import *
 # from FPE import Destination
+import os
 import time
 
 def testCallback(message, receiver):
@@ -11,17 +12,20 @@ def testCallback(message, receiver):
   print("----------")
 
 
+#fpe = FlexPE(config=os.path.expanduser("~")+"/.flexpe/config.test")
 fpe = FlexPE()
-d1=Destination(Destination.IN, Destination.SINGLE, "messenger", "markqvist")
+identity = Identity()
-d1.createKey()
+
+d1=Destination(identity, Destination.IN, Destination.SINGLE, "messenger", "user")
 d1.setCallback(testCallback)
 
-d2=Destination(Destination.IN, Destination.PLAIN, "plainchat", "markqvist")
+# d2=Destination(identity, Destination.IN, Destination.PLAIN, "plainchat", "markqvist")
-d2.setCallback(testCallback)
+# d2.setCallback(testCallback)
 
+print identity.hexhash
 print d1.name
 print d1.hexhash
-print d1.pub
+print d1.identity.pub
 print "---"
 print
 
@@ -32,7 +36,7 @@ for x in range(300):
 	msg += "a"
 signed = d1.sign(msg)
 sl = len(signed)
-pl = len(d1.pub_bytes)
+pl = len(d1.identity.pub_bytes)
 print("Signature length is "+str(sl))
 print("Minimum announce is "+str(pl+sl+8))