#!/usr/bin/python3
"""This is non-obvious, so let me elaborate.  The message is translated to 
binary with one character per binary bit.  Lower case characters are 1's, 
and upper case is 0.  The letters are chosen at random.  Tricky, eh?"""

import random
import crypto

lower = b'abcdefghijklmnopqrstuvwxyz'
upper = lower.upper()

plaintext = [b'The next puzzle starts in the same way, but the result isn\'t '
             b'plain binary.  Think OSI layer 1.',
             b'Yep, we\'re still dealing with just encodings, not encryption.'
             b'Rat Fink']

def encode(text):
    out = bytearray()
    mask = 0x80
    for t in text:
        for i in range(8):
            if t & mask:
                out.append(random.choice(lower))
            else:
                out.append(random.choice(upper))
            t = t << 1
   
    return bytes(out)

def decode(text):
    out = bytearray()
    i = 0
    while i < len(text):
        c = 0
        mask = 0x80
        for j in range(8):
            if text[i] in lower:
                c =  c + mask
            mask = mask >> 1
            i = i + 1
        out.append(c)
    return bytes(out)

print('<p>The 5 byte groupings are just a standard way of displaying cypher text.  It has no bearing on the solution to the puzzle. This format will be used to display the cyphertext from now on.</p>')
crypto.mkIndex(encode, decode, plaintext[0], plaintext[1], crypto.groups)