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Before Identity restructure

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This commit is contained in:
Mark Qvist 2018-03-16 10:50:37 +01:00
parent be8fa4f7bb
commit 5fcbb5d338
16 changed files with 128 additions and 20 deletions
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66
FPE/Destination.py Normal file → Executable file
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@ -1,4 +1,6 @@
import base64
import math
from Identity import Identity
from Transport import Transport
from cryptography.fernet import Fernet
from cryptography.hazmat.primitives import hashes
@ -8,6 +10,10 @@ 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;
@ -86,7 +92,7 @@ class Destination:
if self.type == Destination.SINGLE:
self.prv = rsa.generate_private_key(
public_exponent=65337,
key_size=2048,
key_size=Destination.KEYSIZE,
backend=default_backend()
)
self.prv_bytes = self.prv.private_bytes(
@ -99,6 +105,9 @@ class Destination:
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()
@ -142,14 +151,28 @@ class Destination:
return plaintext
if self.type == Destination.SINGLE and self.prv != None:
ciphertext = self.pub.encrypt(
plaintext,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=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:
@ -164,14 +187,27 @@ class Destination:
return ciphertext
if self.type == Destination.SINGLE and self.prv != None:
plaintext = self.prv.decrypt(
ciphertext,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=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: