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Feature/fix caesar cipher (#1350)

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* change var names for better reading

* rewrite encrypt function to fix ascii char ranges

* fix decrypt function

* update formatting (add f-strings)

* upd fuctions

* add f-string formatting (python3.6+)

* add type hints (python3.4+)
This commit is contained in:
Yurii 2019-10-18 08:36:52 +03:00 committed by Christian Clauss
parent 3cc3531076
commit b7fb0630f2
1 changed files with 35 additions and 34 deletions
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69
ciphers/caesar_cipher.py
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@ -1,61 +1,62 @@
def encrypt(strng, key):
encrypted = ""
for x in strng:
indx = (ord(x) + key) % 256
if indx > 126:
indx = indx - 95
encrypted = encrypted + chr(indx)
return encrypted
def encrypt(input_string: str, key: int) -> str:
result = ''
for x in input_string:
if not x.isalpha():
result += x
elif x.isupper():
result += chr((ord(x) + key - 65) % 26 + 65)
elif x.islower():
result += chr((ord(x) + key - 97) % 26 + 97)
return result
def decrypt(strng, key):
decrypted = ""
for x in strng:
indx = (ord(x) - key) % 256
if indx < 32:
indx = indx + 95
decrypted = decrypted + chr(indx)
return decrypted
def decrypt(input_string: str, key: int) -> str:
result = ''
for x in input_string:
if not x.isalpha():
result += x
elif x.isupper():
result += chr((ord(x) - key - 65) % 26 + 65)
elif x.islower():
result += chr((ord(x) - key - 97) % 26 + 97)
return result
def brute_force(strng):
def brute_force(input_string: str) -> None:
key = 1
decrypted = ""
result = ''
while key <= 94:
for x in strng:
for x in input_string:
indx = (ord(x) - key) % 256
if indx < 32:
indx = indx + 95
decrypted = decrypted + chr(indx)
print("Key: {}\t| Message: {}".format(key, decrypted))
decrypted = ""
result = result + chr(indx)
print(f'Key: {key}\t| Message: {result}')
result = ''
key += 1
return None
def main():
while True:
print("-" * 10 + "\n**Menu**\n" + "-" * 10)
print("1.Encrpyt")
print("2.Decrypt")
print("3.BruteForce")
print("4.Quit")
print(f'{"-" * 10}\n Menu\n{"-", * 10}')
print(*["1.Encrpyt", "2.Decrypt", "3.BruteForce", "4.Quit"], sep='\n')
choice = input("What would you like to do?: ")
if choice not in ["1", "2", "3", "4"]:
print("Invalid choice, please enter a valid choice")
elif choice == "1":
strng = input("Please enter the string to be encrypted: ")
key = int(input("Please enter off-set between 1-94: "))
input_string = input("Please enter the string to be encrypted: ")
key = int(input("Please enter off-set between 0-25: "))
if key in range(1, 95):
print(encrypt(strng.lower(), key))
print(encrypt(input_string.lower(), key))
elif choice == "2":
strng = input("Please enter the string to be decrypted: ")
input_string = input("Please enter the string to be decrypted: ")
key = int(input("Please enter off-set between 1-94: "))
if key in range(1, 95):
print(decrypt(strng, key))
print(decrypt(input_string, key))
elif choice == "3":
strng = input("Please enter the string to be decrypted: ")
brute_force(strng)
input_string = input("Please enter the string to be decrypted: ")
brute_force(input_string)
main()
elif choice == "4":
print("Goodbye.")