tstamprot_test.py

import string
import math


CHARS = string.digits + string.lowercase
assert len(CHARS) == 36
CHARS += string.uppercase
assert len(CHARS) == 62

BASE64_CHARS = string.uppercase + string.lowercase + string.digits  + "+/"

VOWELS = "auoeiy"
LPHNM_CHARS = "".join(c for c in CHARS if c.lower() not in VOWELS)
assert len(LPHNM_CHARS) == 50


def int2pos(a, b):
    for i in xrange(int(math.log(a, b)), -1, -1):
        yield (a/b**i) % b

def tostr(items, alphabet):
    return ''.join(alphabet[i] for i in items)

def rotate(i, rotation, ceil):
    j = i + rotation
    if j >= ceil:
        j = j - ceil
    return j


if __name__ == '__main__':
    alphabet = LPHNM_CHARS
    base = 30
    #import time
    offset = 1394814000000 # int(time.time() * 1000)
    for n in range(0, 999):
        items = list(int2pos(n + offset, base))
        rotation = items[-1]
        scrambled = [rotate(i, rotation, base) for i in items[:-1]]
        scrambled.append(rotation)
        print tostr(items, alphabet), '=>', tostr(scrambled, alphabet)