mirror of
https://github.com/billbuchanan/appliedcrypto.git
synced 2026-02-22 19:57:59 +00:00
78 lines
2.3 KiB
Python
78 lines
2.3 KiB
Python
from cryptography.fernet import Fernet
|
|
import sys
|
|
import binascii
|
|
|
|
operator = "a & b"
|
|
x=0
|
|
y=0
|
|
|
|
operator=operator.replace('or','|')
|
|
operator=operator.replace('and','&')
|
|
operator=operator.replace('xor','^')
|
|
operator=operator.replace('not','~')
|
|
|
|
print "---Input parameters---"
|
|
print "Operation:",operator
|
|
print "Input:",x,y
|
|
|
|
keyX_0 = Fernet.generate_key()
|
|
keyX_1 = Fernet.generate_key()
|
|
keyY_0 = Fernet.generate_key()
|
|
keyY_1 = Fernet.generate_key()
|
|
|
|
data =[]
|
|
for a in range(0,2):
|
|
for b in range(0,2):
|
|
data.append(str(eval(operator) & 0x01))
|
|
print "Outputs of function:",data
|
|
|
|
print "\n---Keys generated---"
|
|
|
|
print "KeyX_0 (first 20 characters):"+binascii.hexlify(bytearray(keyX_0))[:20]
|
|
print "KeyX_1 (first 20 characters):"+binascii.hexlify(bytearray(keyX_1))[:20]
|
|
print "KeyY_0 (first 20 characters):"+binascii.hexlify(bytearray(keyY_0))[:20]
|
|
print "KeyY_1 (first 20 characters):"+binascii.hexlify(bytearray(keyY_1))[:20]
|
|
|
|
print "\n---Cipers send from Bob to Alice---"
|
|
|
|
|
|
cipher_text00 = Fernet(keyY_0).encrypt(Fernet(keyX_0).encrypt(data[0]))
|
|
cipher_text01 = Fernet(keyY_0).encrypt(Fernet(keyX_1).encrypt(data[1]))
|
|
cipher_text10 = Fernet(keyY_1).encrypt(Fernet(keyX_0).encrypt(data[2]))
|
|
cipher_text11 = Fernet(keyY_1).encrypt(Fernet(keyX_1).encrypt(data[3]))
|
|
|
|
print "Cipher (first 20 chars): "+binascii.hexlify(bytearray(cipher_text00))[:40]
|
|
print "Cipher (first 20 chars): "+binascii.hexlify(bytearray(cipher_text01))[:40]
|
|
print "Cipher (first 20 chars): "+binascii.hexlify(bytearray(cipher_text10))[:40]
|
|
print "Cipher (first 20 chars): "+binascii.hexlify(bytearray(cipher_text11))[:40]
|
|
|
|
|
|
if (x==0): keyB = keyX_0
|
|
if (x==1): keyB = keyX_1
|
|
|
|
if (y==0): keyA = keyY_0
|
|
if (y==1): keyA = keyY_1
|
|
|
|
print "\n---Bob and Alice's key---"
|
|
print "Bob's key: "+binascii.hexlify(bytearray(keyB))[:20]
|
|
print "Alice's key: "+binascii.hexlify(bytearray(keyA))[:20]
|
|
|
|
print "\n---Decrypt with keys (where '.' is an exception):"
|
|
|
|
try:
|
|
print Fernet(keyB).decrypt(Fernet(keyA).decrypt(cipher_text00)),
|
|
except:
|
|
print ".",
|
|
try:
|
|
print Fernet(keyB).decrypt(Fernet(keyA).decrypt(cipher_text01)),
|
|
except:
|
|
print ".",
|
|
try:
|
|
print Fernet(keyB).decrypt(Fernet(keyA).decrypt(cipher_text10)),
|
|
except:
|
|
print ".",
|
|
try:
|
|
print Fernet(keyB).decrypt(Fernet(keyA).decrypt(cipher_text11)),
|
|
except:
|
|
print ".",
|