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src/vigenere_cipher_helper.py
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@ -1,56 +0,0 @@
class VigenereCipher(object):
def __init__(self, key, alphabet):
self.key = key
self.alphabet = alphabet
def encode(self, text):
len_text = len(text)
len_key = len(self.key)
if len_key < len_text:
new_key = (
self.key * (len_text // len_key) + self.key[: (len_text % len_key)]
)
else:
new_key = self.key[:len_text]
new_text = []
for l_text, l_key in zip(text, new_key):
if l_text in self.alphabet:
if l_key in self.alphabet:
new_pos = (
self.alphabet.index(l_text) + self.alphabet.index(l_key)
) % len(self.alphabet)
else:
new_pos = self.alphabet.index(l_text)
new_text.append(self.alphabet[new_pos])
else:
new_text.append(l_text)
return "".join(new_text)
def decode(self, text):
len_text = len(text)
len_key = len(self.key)
if len_key < len_text:
new_key = (
self.key * (len_text // len_key) + self.key[: (len_text % len_key)]
)
else:
new_key = self.key[:len_text]
new_text = []
for l_text, l_key in zip(text, new_key):
if l_text in self.alphabet:
if l_key in self.alphabet:
new_pos = (
self.alphabet.index(l_text) - self.alphabet.index(l_key)
) % len(self.alphabet)
else:
new_pos = self.alphabet.index(l_text)
new_text.append(self.alphabet[new_pos])
else:
new_text.append(l_text)
return "".join(new_text)