# -*- coding: UTF-8 -*-

"""Citrix Codec - citrix password encoding.

This codec:

- en/decodes strings from str to str

- en/decodes strings from bytes to bytes

- decodes file content to str (read)

- encodes file content from str to bytes (write)

Reference: https://crypto.interactive-maths.com/atbash-cipher.html

"""

from ..__common__ import *

__examples__ = {

'enc(citrix-ctx0)': None,

'enc(citrix|citrix-1|citrix_ctx1)': {'this is a test': "NBBMNAAGIDEPJJBMNIFNIMEMJKEL"},

}

__guess__ = ["citrix-ctx1"]

_dec = lambda g: ((ord(g[0]) - 0x41) & 0xf) ^ ((((ord(g[1]) - 0x41) & 0xf) << 4) & 0xf0)

_enc = lambda o: chr(((o >> 4) & 0xf) + 0x41) + chr((o & 0xf) + 0x41)

def citrix_encode(t):

def encode(text, errors="strict"):

l = len(text)

r, x = "", 0

for c in text:

x = ord(c) ^ 0xa5 ^ x

r += _enc(x)

return r, l

return encode

def citrix_decode(t):

def decode(text, errors="strict"):

l = len(text)

text = text[::-1]

r = ""

for i in range(0, l, 2):

x = 0 if i + 2 >= l else _dec(text[i+2:i+4])

x ^= _dec(text[i:i+2]) ^ 0xa5

r += chr(x)

return r[::-1], l

return decode

add("citrix", citrix_encode, citrix_decode, r"citrix(|[-_]?(?:ctx)?1)$", entropy=4., printables_rate=1.,

expansion_factor=2.)