mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-05 02:40:16 +00:00
4b79d771cd
* Add more ruff rules * Add more ruff rules * pre-commit: Update ruff v0.0.269 -> v0.0.270 * Apply suggestions from code review * Fix doctest * Fix doctest (ignore whitespace) * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
83 lines
1.9 KiB
Python
83 lines
1.9 KiB
Python
"""
|
|
Author: Mohit Radadiya
|
|
"""
|
|
|
|
from string import ascii_uppercase
|
|
|
|
dict1 = {char: i for i, char in enumerate(ascii_uppercase)}
|
|
dict2 = dict(enumerate(ascii_uppercase))
|
|
|
|
|
|
# This function generates the key in
|
|
# a cyclic manner until it's length isn't
|
|
# equal to the length of original text
|
|
def generate_key(message: str, key: str) -> str:
|
|
"""
|
|
>>> generate_key("THE GERMAN ATTACK","SECRET")
|
|
'SECRETSECRETSECRE'
|
|
"""
|
|
x = len(message)
|
|
i = 0
|
|
while True:
|
|
if x == i:
|
|
i = 0
|
|
if len(key) == len(message):
|
|
break
|
|
key += key[i]
|
|
i += 1
|
|
return key
|
|
|
|
|
|
# This function returns the encrypted text
|
|
# generated with the help of the key
|
|
def cipher_text(message: str, key_new: str) -> str:
|
|
"""
|
|
>>> cipher_text("THE GERMAN ATTACK","SECRETSECRETSECRE")
|
|
'BDC PAYUWL JPAIYI'
|
|
"""
|
|
cipher_text = ""
|
|
i = 0
|
|
for letter in message:
|
|
if letter == " ":
|
|
cipher_text += " "
|
|
else:
|
|
x = (dict1[letter] - dict1[key_new[i]]) % 26
|
|
i += 1
|
|
cipher_text += dict2[x]
|
|
return cipher_text
|
|
|
|
|
|
# This function decrypts the encrypted text
|
|
# and returns the original text
|
|
def original_text(cipher_text: str, key_new: str) -> str:
|
|
"""
|
|
>>> original_text("BDC PAYUWL JPAIYI","SECRETSECRETSECRE")
|
|
'THE GERMAN ATTACK'
|
|
"""
|
|
or_txt = ""
|
|
i = 0
|
|
for letter in cipher_text:
|
|
if letter == " ":
|
|
or_txt += " "
|
|
else:
|
|
x = (dict1[letter] + dict1[key_new[i]] + 26) % 26
|
|
i += 1
|
|
or_txt += dict2[x]
|
|
return or_txt
|
|
|
|
|
|
def main() -> None:
|
|
message = "THE GERMAN ATTACK"
|
|
key = "SECRET"
|
|
key_new = generate_key(message, key)
|
|
s = cipher_text(message, key_new)
|
|
print(f"Encrypted Text = {s}")
|
|
print(f"Original Text = {original_text(s, key_new)}")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|
|
main()
|