mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-11-05 13:50:14 +00:00
229 lines
6.6 KiB
Python
Executable File
229 lines
6.6 KiB
Python
Executable File
import base64
|
|
import math
|
|
from Identity import Identity
|
|
from Transport import Transport
|
|
from cryptography.fernet import Fernet
|
|
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 Destination:
|
|
KEYSIZE = Identity.KEYSIZE;
|
|
PADDINGSIZE= Identity.PADDINGSIZE;
|
|
|
|
# Constants
|
|
SINGLE = 0x01;
|
|
GROUP = 0x02;
|
|
PLAIN = 0x03;
|
|
types = [SINGLE, GROUP, PLAIN]
|
|
|
|
IN = 0x11;
|
|
OUT = 0x12;
|
|
directions = [IN, OUT]
|
|
|
|
@staticmethod
|
|
def getDestinationName(app_name, *aspects):
|
|
# Check input values and build name string
|
|
if "." in app_name: raise ValueError("Dots can't be used in app names")
|
|
|
|
name = app_name
|
|
for aspect in aspects:
|
|
if "." in aspect: raise ValueError("Dots can't be used in aspects")
|
|
name = name + "." + aspect
|
|
|
|
return name
|
|
|
|
|
|
@staticmethod
|
|
def getDestinationHash(app_name, *aspects):
|
|
name = Destination.getDestinationName(app_name, *aspects)
|
|
|
|
# Create a digest for the destination
|
|
digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
|
|
digest.update(name)
|
|
|
|
return digest.finalize()[:10]
|
|
|
|
|
|
def __init__(self, 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")
|
|
if not direction in Destination.directions: raise ValueError("Unknown destination direction")
|
|
self.type = type
|
|
self.direction = direction
|
|
self.mtu = 0
|
|
|
|
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)
|
|
|
|
|
|
def __str__(self):
|
|
return "<"+self.name+"/"+self.hexhash+">"
|
|
|
|
|
|
def setCallback(self, callback):
|
|
self.callback = callback
|
|
|
|
|
|
def receive(self, data):
|
|
plaintext = self.decrypt(data)
|
|
if plaintext != None and self.callback != None:
|
|
self.callback(plaintext, self)
|
|
|
|
|
|
def createKey(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(
|
|
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):
|
|
if self.type == Destination.PLAIN:
|
|
raise TypeError("A plain destination does not hold any keys")
|
|
else:
|
|
return self.prv_bytes
|
|
|
|
|
|
def loadKey(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
|
|
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
|
|
self.prv = Fernet(self.prv_bytes)
|
|
|
|
def loadPublicKey(self, key):
|
|
if self.type != Destination.SINGLE:
|
|
raise TypeError("Only the \"single\" destination type can hold a public key")
|
|
|
|
self.pub_bytes = key
|
|
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:
|
|
chunksize = (Destination.KEYSIZE-Destination.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
|
|
|
|
if self.type == Destination.GROUP and self.prv != None:
|
|
try:
|
|
return base64.urlsafe_b64decode(self.prv.encrypt(plaintext))
|
|
except:
|
|
return None
|
|
|
|
|
|
def decrypt(self, ciphertext):
|
|
if self.type == Destination.PLAIN:
|
|
return ciphertext
|
|
|
|
if self.type == Destination.SINGLE and self.prv != None:
|
|
print("Ciphertext length is "+str(len(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:
|
|
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:
|
|
return None |