code: def cmd_xor(k, i, o):
      
  
      o.write(xor(i.read(), k.encode()))
docs: XOR cipher.
  
      Note: XOR is not a 'secure cipher'. If you need strong crypto you must use
      algorithms like AES. You can use habu.fernet for that.
  
      Example:
  
      \b
      $ habu.xor -k mysecretkey -i /bin/ls > xored
      $ habu.xor -k mysecretkey -i xored > uxored
      $ sha1sum /bin/ls uxored
      $ 6fcf930fcee1395a1c95f87dd38413e02deff4bb  /bin/ls
      $ 6fcf930fcee1395a1c95f87dd38413e02deff4bb  uxored