def recv_msg(self):
cipher = self.s.recv(2048)
iv = cipher[0:16]
cipher = cipher[16:]
#print 'iv - ',iv
#print 'cipher - ',cipher
return chal10.decrypt_CBC(cipher, self.key, iv)
def decrypt_oracle(ciphertext):
plaintext = chal10.decrypt_CBC(
ciphertext, KEY,
iv) #The function will implicitly check for correct padding
s_elements = plaintext.split(';')
print s_elements
if 'admin=true' in s_elements:
return True
else:
return False
g = 2
a = randint(1, p)
A = pow(g, a, p)
packet = {}
packet['p'] = p
packet['g'] = g
packet['A'] = A
c.send(json.dumps(packet))
print "p,g,A sent to B"
response = json.loads(c.recv(1024))
B = response['B']
print 'B received'
msg = "Hello B"
s = pow(B, a, p)
hash = SHA1()
hash.update(str(s))
key = hash.hexdigest()[0:16]
#print key
iv = chal11.get_random_bytes(16)
#print 'iv - ',iv
cipher = chal10.encrypt_CBC(msg, key, iv)
cipher = iv + cipher
#print cipher
c.send(cipher)
response = c.recv(1024)
cipher = response[16:]
iv = response[:16]
msg = chal10.decrypt_CBC(cipher, key, iv)
print 'Message from B - ', msg
c.close()
def recv_msg(self):
response = self.c.recv(1024)
cipher = response[16:]
iv = response[:16]
return chal10.decrypt_CBC(cipher, self.key, iv)
def check_CBC_padding_oracle(ciphertext, key, iv):
try:
palintext = chal10.decrypt_CBC(ciphertext, key, iv)
return True
except:
return False
