def otp(text, key_txt, encdec=-1):
"""encdec = -1 for decode, 1 for encode
text = the text to encode or decode.
key = the key (pad) to use"""
pad = ""
out = ""
c = ""
key = key_txt.upper()
for x in key:
if x in alphabet(upper=True):
pad += x
for x in text:
uc = " "
if x in alphabet(upper=True):
uc = "A"
if x in alphabet():
uc = "a"
if uc != " ":
if len(pad) == 0:
pad = "AAAAAAAA"
c = ord(x) - ord(uc[0]) + encdec * (ord(pad[0]) - ord("A"))
c = (c + 26) % 26
c = chr(ord(uc[0]) + c)
pad = pad[1:len(pad)]
out += c
return out
def bifid_key(letters):
AB = letters.upper().replace("J", "I").replace(" ", "") + alphabet(True).replace("J", "")
_(AB)
ret = ""
for l in AB:
if l in ret:
continue
ret += l
_(ret)
return ret
def tabula_recta(text, key) -> str:
"""Encodes text based on the provided key according to the Vingenere Cypher"""
k = key.strip().upper()
txt = text.strip().upper()
alpha = list(alphabet(True))
while len(k) < len(txt):
k += key.strip().upper()
answer = ""
for i, x in enumerate(txt):
cipher = rotate(alpha, alphabet_loc(x, 0))
loc = alphabet_loc(k[i], 0)
answer += cipher[loc]
return answer
def tabula_recta_decode(text, key) -> str:
"""Decodes to original text based on the provided cyphered text and the provided key"""
k = key.strip().upper()
txt = text.strip().upper()
alpha = list(alphabet(True))
while len(k) < len(txt):
k += key.strip().upper()
answer = ""
for i, x in enumerate(txt):
pos = alpha.index(k[i])
for idx in range(0, 25):
cypher = rotate(alpha, idx)
if cypher[pos] == x:
answer += alpha[idx]
break
return answer
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from ivonet.crypto.key_word_substitution import KeyWordSubstitution
from ivonet.string.alphabet import alphabet
__doc__ = """
This module does simple substitution on text based an a alphabet and indexing
"""
DEFAULT_ALPHABET = (" " + alphabet()).upper()
def numbers_to_text(number, alpha=DEFAULT_ALPHABET):
"""
# Numbers 2 text
This function translates via number substitution a number to text.
This is a very fragile function as it will only work in certain cases.
"""
return "".join([alpha[int(x)] for x in number])
def text_to_numbers(text, alpha=DEFAULT_ALPHABET):
"""
# Text 2 numbers
Function to translate text to numbers via number substitution.
Find the index of the letter in the alphabet to find the number.
"""
return "".join([str(alpha.index(x)) for x in text.upper()])