mirror of
https://github.com/TheAlgorithms/Python.git
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71 lines
1.7 KiB
Python
71 lines
1.7 KiB
Python
import sys, random
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LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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def main():
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message = input('Enter message: ')
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key = 'LFWOAYUISVKMNXPBDCRJTQEGHZ'
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resp = input('Encrypt/Decrypt [e/d]: ')
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checkValidKey(key)
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if resp.lower().startswith('e'):
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mode = 'encrypt'
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translated = encryptMessage(key, message)
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elif resp.lower().startswith('d'):
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mode = 'decrypt'
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translated = decryptMessage(key, message)
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print('\n%sion: \n%s' % (mode.title(), translated))
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def checkValidKey(key):
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keyList = list(key)
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lettersList = list(LETTERS)
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keyList.sort()
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lettersList.sort()
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if keyList != lettersList:
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sys.exit('Error in the key or symbol set.')
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def encryptMessage(key, message):
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"""
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>>> encryptMessage('LFWOAYUISVKMNXPBDCRJTQEGHZ', 'Harshil Darji')
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'Ilcrism Olcvs'
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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('LFWOAYUISVKMNXPBDCRJTQEGHZ', 'Ilcrism Olcvs')
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'Harshil Darji'
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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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charsA = LETTERS
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charsB = key
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if mode == 'decrypt':
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charsA, charsB = charsB, charsA
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for symbol in message:
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if symbol.upper() in charsA:
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symIndex = charsA.find(symbol.upper())
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if symbol.isupper():
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translated += charsB[symIndex].upper()
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else:
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translated += charsB[symIndex].lower()
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else:
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translated += symbol
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return translated
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def getRandomKey():
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key = list(LETTERS)
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random.shuffle(key)
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return ''.join(key)
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if __name__ == '__main__':
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main()
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