mirror of https://github.com/dirtbags/moth.git
25 lines
624 B
Python
25 lines
624 B
Python
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plaintext = [b'all hail ceasar.', b'ceasar is the key']
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alpha = b'abcdefghijklmnopqrstuvwxyz'
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def ceasar(text, r):
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out = bytearray()
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for t in text:
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if t in alpha:
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t = t - b'a'[0]
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t = (t + r)%26
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out.append(t + b'a'[0])
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else:
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out.append(t)
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return bytes(out)
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encode = lambda text : ceasar(text, 13)
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decode = lambda text : ceasar(text, -13)
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c = encode(plaintext[0])
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print('<dl><dt>Alice<dd>', str(c, 'utf-8'))
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assert decode(c) == plaintext[0]
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c = encode(plaintext[1])
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print('<dt>Bob<dd>', str(c, 'utf-8'), '</dl>')
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assert decode(c) == plaintext[1]
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