mirror of
https://github.com/TheAlgorithms/Python.git
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66 lines
1.7 KiB
Python
66 lines
1.7 KiB
Python
LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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def main():
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message = input("Enter message: ")
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key = input("Enter key [alphanumeric]: ")
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mode = input("Encrypt/Decrypt [e/d]: ")
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if mode.lower().startswith("e"):
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mode = "encrypt"
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translated = encryptMessage(key, message)
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elif mode.lower().startswith("d"):
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mode = "decrypt"
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translated = decryptMessage(key, message)
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print("\n%sed message:" % mode.title())
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print(translated)
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def encryptMessage(key, message):
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"""
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>>> encryptMessage('HDarji', 'This is Harshil Darji from Dharmaj.')
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'Akij ra Odrjqqs Gaisq muod Mphumrs.'
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"""
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return translateMessage(key, message, "encrypt")
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def decryptMessage(key, message):
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"""
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>>> decryptMessage('HDarji', 'Akij ra Odrjqqs Gaisq muod Mphumrs.')
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'This is Harshil Darji from Dharmaj.'
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"""
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return translateMessage(key, message, "decrypt")
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def translateMessage(key, message, mode):
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translated = []
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keyIndex = 0
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key = key.upper()
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for symbol in message:
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num = LETTERS.find(symbol.upper())
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if num != -1:
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if mode == "encrypt":
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num += LETTERS.find(key[keyIndex])
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elif mode == "decrypt":
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num -= LETTERS.find(key[keyIndex])
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num %= len(LETTERS)
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if symbol.isupper():
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translated.append(LETTERS[num])
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elif symbol.islower():
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translated.append(LETTERS[num].lower())
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keyIndex += 1
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if keyIndex == len(key):
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keyIndex = 0
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else:
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translated.append(symbol)
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return "".join(translated)
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if __name__ == "__main__":
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main()
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