decode_base64_with_Incorrect_padding.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

__author__ = "ipetrash"


# SOURCE: https://stackoverflow.com/a/32517907/5909792


import base64


def base64_decode(text: str) -> bytes:
    text += "=" * (-len(text) % 4)
    return base64.b64decode(text)


if __name__ == "__main__":
    bad_b64_string = "7P1pbxvJtjXqfr+/Qnd92huoKrFVk8ABXhUl1+td7iDJ68L3+IBISbTMpYa+pMQq1cH57zeSndjMmZEyqYwYkwN7G7UsU1SMZIQ4Hmb3f9Yq1cNfK41fK7Wd6l5SqSTNyv"

    try:
        print(base64.b64decode(bad_b64_string))
    except Exception as e:
        print(e)  # Incorrect padding

    print(base64_decode(bad_b64_string))
    # b'\xec\xfdio\x1b\xc9\xb65\xea~\xbf\xbfBw}\xda\x1b\xa8*\xb1U\x93\xc0\x01^\x15%\xd7\xeb]\xee \xc9\xeb\xc2\xf7\xf8\x80HI\xb4\xcc\xa5\x86\xbe\xa4\xc4*\xd5\xc1\xf9\xef7\x92\x9d\xd8\xcc\x99\x912\xa9\x8c\x18\x93\x03{\x1b\xb5,ST\x8cd\x848\x1ef\xf7\x7f\xd6*\xd5\xc3_+\x8d_+\xb5\x9d\xea^R\xa9$\xcd\xca'
    print()

    good_b64_string = "7P1pbxvJtjXqfr+/Qnd92huoKrFVk8ABXhUl1+td7iDJ68L3+IBISbTMpYa+pMQq1cH57zeSndjMmZEyqYwYkwN7G7UsU1SMZIQ4Hmb3f9Yq1cNfK41fK7Wd6l5SqSTNyv=="
    print(base64.b64decode(good_b64_string))
    # b'\xec\xfdio\x1b\xc9\xb65\xea~\xbf\xbfBw}\xda\x1b\xa8*\xb1U\x93\xc0\x01^\x15%\xd7\xeb]\xee \xc9\xeb\xc2\xf7\xf8\x80HI\xb4\xcc\xa5\x86\xbe\xa4\xc4*\xd5\xc1\xf9\xef7\x92\x9d\xd8\xcc\x99\x912\xa9\x8c\x18\x93\x03{\x1b\xb5,ST\x8cd\x848\x1ef\xf7\x7f\xd6*\xd5\xc3_+\x8d_+\xb5\x9d\xea^R\xa9$\xcd\xca'

    print(base64_decode(good_b64_string))
    # b'\xec\xfdio\x1b\xc9\xb65\xea~\xbf\xbfBw}\xda\x1b\xa8*\xb1U\x93\xc0\x01^\x15%\xd7\xeb]\xee \xc9\xeb\xc2\xf7\xf8\x80HI\xb4\xcc\xa5\x86\xbe\xa4\xc4*\xd5\xc1\xf9\xef7\x92\x9d\xd8\xcc\x99\x912\xa9\x8c\x18\x93\x03{\x1b\xb5,ST\x8cd\x848\x1ef\xf7\x7f\xd6*\xd5\xc3_+\x8d_+\xb5\x9d\xea^R\xa9$\xcd\xca'