def CBC_encryption_oracle(user_input):
prepend = "comment1=cooking%20MCs;userdata="
append = ";comment2=%20like%20a%20pound%20of%20bacon;"
user_input = user_input.replace(';', '').replace('=', '')
to_encrypt = s2_1.pad_string_pkcs7(
(prepend + user_input + append).encode())
encrypted_string = s2_2.CBC_encrypt(to_encrypt, unkown_key, IV)
return encrypted_string
def encryption_oracle(input_string):
key = rand_key_gen()
app_bef = os.urandom(random.randint(5, 10))
app_aft = os.urandom(random.randint(5, 10))
_unencrypted = app_bef + input_string + app_aft
last_block_len = (len(_unencrypted) % 16)
last_block = _unencrypted[-last_block_len:]
to_encrypt = _unencrypted[:-last_block_len] + s2_1.pkcs7_pad(
last_block, 16)
mode = random.randint(0, 1)
print(mode)
if mode == 0:
encrypted_string = s2_2.encrypt_AES_ECB(to_encrypt, key)
else:
encrypted_string = s2_2.CBC_encrypt(to_encrypt, key)
return encrypted_string, mode
def main():
print("Running Client")
p=37
g=5
a=random.randint(0, p)
A=pow(g, a, p)
client1=Client()
print("*Client* | Attempting Connection")
client1.connectTo(3500, socket.gethostname())
status=client1.recieve()
print(str(status))
client1.send(p.to_bytes(16, 'big'))
client1.send(g.to_bytes(16, 'big'))
client1.send(A.to_bytes(16, 'big'))
B=client1.recieve()
B=int.from_bytes(B, 'big')
s=pow(B, a, p)
message=b"Shh. Issa Secret."
SHA=s4_4.SHA1()
CBCkey=bytes.fromhex(SHA.Hash(bytes([s]))[0:32])
IV=os.urandom(16)
encrypted_message=s2_2.CBC_encrypt(message, CBCkey, IV)
client1.send(encrypted_message)
client1.send(IV)
bot_message=client1.recieve()
bot_IV=client1.recieve()
returned_message=s2_2.CBC_decrypt(bot_message, CBCkey, bot_IV)
print("*CLIENT* | Echoed Message: " + str(returned_message))
client1.close()
def CBC_encryption_oracle(user_input):
to_encrypt=s2_1.pad_string_pkcs7((user_input))
encrypted_string=s2_2.CBC_encrypt(to_encrypt, unknown_key, IV)
return encrypted_string
def u_encrypt_cbc(plain_text):
padded_plain_text = s2_1.pad_string_pkcs7(plain_text)
cipher_text = s2_2.CBC_encrypt(padded_plain_text, ukey, IV)
return cipher_text