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60895366c0
* fix(mypy): type annotations for cipher algorithms * Update mypy workflow to include cipher directory * fix: mypy errors in hill_cipher.py * fix build errors
64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
from typing import Literal
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LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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def translate_message(
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key: str, message: str, mode: Literal["encrypt", "decrypt"]
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) -> str:
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"""
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>>> translate_message("QWERTYUIOPASDFGHJKLZXCVBNM","Hello World","encrypt")
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'Pcssi Bidsm'
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"""
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chars_a = LETTERS if mode == "decrypt" else key
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chars_b = key if mode == "decrypt" else LETTERS
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translated = ""
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# loop through each symbol in the message
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for symbol in message:
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if symbol.upper() in chars_a:
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# encrypt/decrypt the symbol
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sym_index = chars_a.find(symbol.upper())
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if symbol.isupper():
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translated += chars_b[sym_index].upper()
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else:
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translated += chars_b[sym_index].lower()
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else:
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# symbol is not in LETTERS, just add it
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translated += symbol
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return translated
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def encrypt_message(key: str, message: str) -> str:
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"""
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>>> encrypt_message("QWERTYUIOPASDFGHJKLZXCVBNM", "Hello World")
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'Pcssi Bidsm'
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"""
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return translate_message(key, message, "encrypt")
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def decrypt_message(key: str, message: str) -> str:
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"""
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>>> decrypt_message("QWERTYUIOPASDFGHJKLZXCVBNM", "Hello World")
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'Itssg Vgksr'
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"""
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return translate_message(key, message, "decrypt")
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def main() -> None:
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message = "Hello World"
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key = "QWERTYUIOPASDFGHJKLZXCVBNM"
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mode = "decrypt" # set to 'encrypt' or 'decrypt'
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if mode == "encrypt":
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translated = encrypt_message(key, message)
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elif mode == "decrypt":
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translated = decrypt_message(key, message)
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print(f"Using the key {key}, the {mode}ed message is: {translated}")
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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main()
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