jvarho

#!/usr/bin/env python2
#
# Copyright (c) 2016, Jan Varho
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

jvarho

alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

class Rotor():
    perms = []
    turnover_position = ''
    position = 'A'
    def __init__(self, perms, turnover_position, ring_setting):
        i = alphabet.index(ring_setting)
        perms = perms[i:] + perms[:i]
        self.perms = [c for c in perms]

jvarho

with open('in.pnm') as f:
    data = f.read().split('\n')

data[-1] = bytearray(data[-1])
for i, j in enumerate(data[-1]):
    data[-1][i] = (j & 3) * 255 / 3

data[-1] = bytes(data[-1])
with open('out.pnm', 'w') as f:
    f.write('\n'.join(data))

jvarho

import hashlib

def H(s):
    for i in xrange(N):
        s = hashlib.sha1(s).hexdigest()[:4]
    return s

n = 1000000

for N in range(1, 17):