CloudFlare email protection encoding, decoding with python.

decode_cfemail.py

# -*- coding: utf-8 -*-

def decode_cfemail(enc):
    from textwrap import wrap
    res = ''
    key = int(enc[:2], 16)
    for v in wrap(enc[2:], 2):
        res += chr(int(v, 16) ^ key)
    return res

"""
e.g.
    `<span class="__cf_email__" data-cfemail="ee96988b948a8fae808f988b9cc08d8183">[email&#160;protected]</span>`
    
    >>> decode_cfemail('ee96988b948a8fae808f988b9cc08d8183')
    'xvezda@naver.com'
"""

encode_cfemail.py

# -*- coding: utf-8 -*-

from __future__ import print_function


def encode_cfemail(email):
    def hexpad(char):
        return char[2:].zfill(2)

    from random import random as rand

    # Generate random key
    key = int(rand() * (0xff+1) + 1)  # 0x01 ~ 0xff
    # Prefix key
    enc = hexpad(hex(key))
    for c in email:
        # Build string
        enc += hexpad(hex(ord(c) ^ key))
    return enc

"""
e.g.
    >>> encode_cfemail('xvezda@naver.com')
    'cdb5bba8b7a9ac8da3acbba8bfe3aea2a0'
"""

https://xvezda.com/analyzing-cloudflare-email-protection-algorithm.html