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46 lines
1.2 KiB
Python
46 lines
1.2 KiB
Python
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from string import ascii_uppercase
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def gronsfeld(text: str, key: str) -> str:
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"""
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Encrypt plaintext with the Gronsfeld cipher
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>>> gronsfeld('hello', '412')
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'LFNPP'
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>>> gronsfeld('hello', '123')
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'IGOMQ'
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>>> gronsfeld('', '123')
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''
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>>> gronsfeld('yes, ¥€$ - _!@#%?', '0')
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'YES, ¥€$ - _!@#%?'
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>>> gronsfeld('yes, ¥€$ - _!@#%?', '01')
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'YFS, ¥€$ - _!@#%?'
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>>> gronsfeld('yes, ¥€$ - _!@#%?', '012')
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'YFU, ¥€$ - _!@#%?'
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>>> gronsfeld('yes, ¥€$ - _!@#%?', '')
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Traceback (most recent call last):
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...
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ZeroDivisionError: integer modulo by zero
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"""
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ascii_len = len(ascii_uppercase)
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key_len = len(key)
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encrypted_text = ""
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keys = [int(char) for char in key]
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upper_case_text = text.upper()
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for i, char in enumerate(upper_case_text):
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if char in ascii_uppercase:
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new_position = (ascii_uppercase.index(char) + keys[i % key_len]) % ascii_len
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shifted_letter = ascii_uppercase[new_position]
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encrypted_text += shifted_letter
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else:
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encrypted_text += char
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return encrypted_text
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if __name__ == "__main__":
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from doctest import testmod
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testmod()
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