CODEWITHSUNDEEP
encryptiontcpwebsocketkeyxtea
bobdxcool
bobdxcool

Reputation: 91

ValueError: Key must be 128 bit long XTEA

I am trying to encrypt data and send it over a TCP socket to my server. However I am getting the error, ValueError: Key must be 128 bit long for the code below:

from xtea import *
from socket import *
import datetime
import time
import sys
clientsocket = socket(AF_INET,SOCK_STREAM)
clientsocket.connect(("xx.xx.xx.xx",1234))
key2="0wYwcOnn"
text = "$123456781|tx|id1^1.1^2015-09-29 16:38:44^2015-09-29 19:48:44"
x = new(key2, mode=MODE_ECB)
c = x.encrypt(text)
clientsocket.send(c)
recv = clientsocket.recv(1024)
print(recv)

Can anyone please comment on this?

Upvotes: 0

Views: 429

Answers (2)

hanshenrik
hanshenrik

Reputation: 21583

XTEA requires a 128bit (16 bytes) key.

one possible padding scheme for keys that are less than 16 bytes long, is to simply pad it with null bytes until it's 16 bytes. according to the guy Wooble at irc://irc.freenode.net/#python , this should work: 

key2=struct.pack('16s', b"0wYwcOnn")
  • it just fills the missing bytes with nulls until it's 16 bytes, or so i've been told. (idk, i don't do python programming)

Upvotes: 0

zaph
zaph

Reputation: 112875

Increase the key size to 16-bytes.

XTEA is a 64-bit block Feistel cipher with a 128-bit key. Since "0wYwcOnn" is 64 bits (at best) what is the misunderstanding?

Upvotes: 1

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