cypherText.py

from string import whitespace, punctuation, digits, ascii_lowercase as letters
# from enchant import Dict
from requests import get

dic1 = dict()
dic2 = dict()
for i, l in enumerate(letters):
    dic1.update({l.lower(): i})
    dic1.update({i: l.upper()})
    dic2.update({l.upper(): i})
    dic2.update({i: l.lower()})


def is_proper_english(string):
    words = string.strip(whitespace + punctuation + digits).split()  # split string into words
    for word in words:
        response = get(
            f"https://api.dictionaryapi.dev/api/v2/entries/en/{word}")
        if response.status_code == 404:  # check if word is not found in the dictionary
            return False
    return True


"""
def is_proper_english(string):
    d = Dict("en_US")  # load English dictionary
    words = string.strip(whitespace + punctuation + digits).split()  # split string into words
    for word in words:
        if not d.check(word):  # check if word is spelled correctly
            return False
    return True
"""


def encrypt(str1, k):
    if k > 25:
        return None
    enc = ""
    for s in str1.lower():
        if s in whitespace + punctuation + digits:
            enc += s
            continue
        enc += dic1.get((dic1.get(s) + k) % 26)
    return enc


def decrypt(str1, k):
    if k > 25:
        return None
    enc = ""
    for s in str1.upper():
        if s in whitespace + punctuation + digits:
            enc += s
            continue
        enc += dic2.get((dic2.get(s) - k) % 26)
    return enc


def hackit(str1):
    for k in range(26):
        for s in str1.split():
            if len(s.strip(whitespace + punctuation + digits)) < 3:
                continue
            if is_proper_english(decrypt(s, k)):
                text = decrypt(str1, k)
                if is_proper_english(text):
                    return text, k
    return None, None


def welcome():
    print("What you want to do?")
    print("\t1. Encrypt a message")
    print("\t2. Decrypt a Cipher Text")
    print("\t3. Hack a Cipher Text")
    print("To exit enter q")
    return eval(input(":-> "))


while True:
    flag = welcome()
    if flag == 1:
        print(encrypt(input("\nEnter the text to encrypt: "), int(input("Enter the key number: "))), end="\n\n")
    elif flag == 3:
        str2, key = hackit(input("\nEnter the message to hack: "))
        print(f"\nstr: {str2} | key: {key}", end="\n\n")
    elif flag == 2:
        print(decrypt(input("\nEnter the text to decrypt: "), int(input("Enter the key number: "))), end="\n\n")
    else:
        # print("\nPlease enter a numerical value between 1-3 and try again!", end="\n\n")
        break