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87 lines
1.8 KiB
87 lines
1.8 KiB
import random
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def encode(msg, pad):
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return msg
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def decode(msg, pad):
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return msg
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def create_pad(length, width=72):
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chars = _create_chars_for_pad(length)
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lines = _chunk_chars_into_lines(chars, width=width)
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return '\n\n\n'.join(lines)
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def _create_chars_for_pad(length):
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chars = []
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for char in range(length):
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chars.append(_AS_ALPHA[random.randint(1, 25)])
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return ''.join(chars)
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def _chunk_chars_into_lines(chars, width=72):
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lines = []
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for chunk in _as_line_chunks(chars, width=width):
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lines.append(chunk)
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return lines
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def _as_line_chunks(chars, width=72):
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chunk = []
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for char in chars:
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chunk.append(char)
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if len(chunk) == width:
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yield ''.join(chunk)
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chunk = []
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if len(chunk) < width:
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chunk += (['.'] * (width - len(chunk)))
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yield ''.join(chunk)
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def _padfill(text, pad):
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padlines = pad.splitlines()
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textlines = _chunk_chars_into_lines(text, _get_textwidth(pad))
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for lineno, padline in enumerate(padlines[:]):
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if _is_padline(lineno) or _is_cipherline(lineno):
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continue
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else:
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padlines[lineno] = textlines.pop(0) if textlines[1:] else ''
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return padlines
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def _get_textwidth(text):
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return max([len(line) for line in text.splitlines()])
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def _is_padline(lineno):
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return not lineno % 3
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def _is_txtline(lineno):
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return (lineno % 2 and not lineno % 3)
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def _is_cipherline(lineno):
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return lineno % PAD_MODULO
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def _mk_as_alpha():
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as_alpha = dict()
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a_chr = ord('A')
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past_j = False
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for char in range(26):
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letter = chr(a_chr + char)
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if letter != 'J':
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key = char + (1 if not past_j else 0)
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as_alpha[key] = letter
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else:
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past_j = True
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return as_alpha
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_AS_ALPHA = _mk_as_alpha()
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