Caesar base64(rotn) visual bruteforce

base64_caesar.py

## Caesar base64(rotn) visual bruteforce
# @author intrd - http://dann.com.br/
# @license Creative Commons Attribution-ShareAlike 4.0 International License - http://creativecommons.org/licenses/by-sa/4.0/

import base64, string

def caesar_int(ch, shift):
    n = ord(ch)
    if ord('a') <= n <= ord('z'):
        n = n - ord('a')
        n = (n + shift) % 26
        n = n + ord('a')
        return chr(n)
    elif ord('A') <= n <= ord('Z'):
        n = n - ord('A')
        n = (n + shift) % 26
        n = n + ord('A')
        return chr(n)
    else:
        return ch

def caesar(s, shift):
    return ''.join(caesar_int(ch, shift) for ch in s)

for x in range(0, 40):
    try:
        print(base64.b64decode(caesar('Xxxxxxxxxxxxxxxxxxxxxx==',x)))
    except Exception:
        pass