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LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
def main() -> None:
message = input("Enter message: ")
key = input("Enter key [alphanumeric]: ")
mode = input("Encrypt/Decrypt [e/d]: ")
if mode.lower().startswith("e"):
mode = "encrypt"
translated = encrypt_message(key, message)
elif mode.lower().startswith("d"):
mode = "decrypt"
translated = decrypt_message(key, message)
print(f"\n{mode.title()}ed message:")
print(translated)
def encrypt_message(key: str, message: str) -> str:
"""
>>> encrypt_message('HDarji', 'This is Harshil Darji from Dharmaj.')
'Akij ra Odrjqqs Gaisq muod Mphumrs.'
"""
return translate_message(key, message, "encrypt")
def decrypt_message(key: str, message: str) -> str:
"""
>>> decrypt_message('HDarji', 'Akij ra Odrjqqs Gaisq muod Mphumrs.')
'This is Harshil Darji from Dharmaj.'
"""
return translate_message(key, message, "decrypt")
def translate_message(key: str, message: str, mode: str) -> str:
translated = []
key_index = 0
key = key.upper()
for symbol in message:
num = LETTERS.find(symbol.upper())
if num != -1:
if mode == "encrypt":
num += LETTERS.find(key[key_index])
elif mode == "decrypt":
num -= LETTERS.find(key[key_index])
num %= len(LETTERS)
if symbol.isupper():
translated.append(LETTERS[num])
elif symbol.islower():
translated.append(LETTERS[num].lower())
key_index += 1
if key_index == len(key):
key_index = 0
else:
translated.append(symbol)
return "".join(translated)
if __name__ == "__main__":
main()
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