poor man crypto

pm_crypto.py

# poor man crypto
import base64

def _shiftchars(s):
    lens = len(s)
    if lens == 1:
        return s
    elif lens == 2:
        return s[1]+s[0]
    else:
        return s[-1]+s[1:-1]+s[0]


def encode(msg, scramble=True):
    enc = base64.urlsafe_b64encode(msg)
    enc = enc.encode('rot13')[::-1]
    if scramble:
        enc = _shiftchars(enc)
    return enc

def decode(msg, scramble=True):
    if scramble:
        dec = _shiftchars(msg)
    else:
        dec = msg
    dec = base64.urlsafe_b64decode(dec[::-1].encode('rot13'))
    return dec