HTB obscurity SecureCrypt cracker

decypter.py

#! /usr/bin/python
import sys,os

if "--help" in sys.argv:
    print "Usage: ./decrypter.py <encrypted> <wordlist>"

wordlist = sys.argv[2]
words = open(wordlist, 'r', encoding='latin-1').read().split()
wordcount = len(words)

def decrypt(text, key):
    keylen = len(key)
    keyPos = 0
    decrypted = ""
    for x in text:
        keyChr = key[keyPos]
        newChr = ord(x)
        newChr = chr((newChr - ord(keyChr)) % 255)
        decrypted += newChr
        keyPos += 1
        keyPos = keyPos % keylen
    return decrypted

text = open("check.txt", 'r').read()
outtext = open(sys.argv[1], 'r').read()

i = 1
for w in words:
    print("{}/{}".format(i,wordcount))
    if text == decrypt(outtext, w):
        print("\nfound key: " + w)
        exit()
    i += 1

# By LevitatingBusinessMan

"""
#ABCDEFGHIJKLMNOPQRSTUVWXYZ
chars = "abcdefghijklmnopqrstuvwxyz0123456789";
maxLength = 10;

indeces = [0];

while (len(indeces) < maxLength):

    def increase (index):

        if indeces[index] < len(chars) - 1:
            indeces[index] += 1
        
        else:

            indeces[index] = 0

            if index == 0:
                indeces.insert(0,0)
            
            else:
                increase(index-1)

    string = ""
    for x in indeces:
        string += chars[x]

    if decrypt(outtext, string) == text:
        print("\nfound key: " + string)
        exit()

    print(string)

    lastElementIndex = len(indeces) - 1
    increase(lastElementIndex)
"""