dc.py

import json

class Decoder():
    def __init__(self):
        self.oldKey = input("Put in your key: ") #string
        if len(self.oldKey) > 676:
            print("Error, Invalid Key")
            exit()
        self.decodeKey()
        self.createEncryption()
        self.createCypher()
        alphabet = ['@', '6', '"', '^', '!', 'Q', 'E', ')', 'U', 'X', '&', 'Y', 'G', 'o', '*', '{', 'l', 'x', '3', ';', "'", '8', 'N', '2', 'T', 'F', 's', '>', 'e', '-', 'k', ' ', '\\', '#', ':', '.', ']', 'g', '%', 'f', 'q', '4', '}', 'u', '$', 'T', 'z', '|', '(', '9', 'h', '1', 'Z', 'a', '7', 'R', '<', ',', 'K', '/', 'w', 'P', 'C', 'y', 'r', 'L', 'M', 'p', '0', '5', 'O', 'Q', 'n', 'c', '[', 'v', 'S', 't', '=', 'j', 'A', 'J', 'W', '_', 'D', 'I', 'b', 'i', 'B', 'd', 'V', 'm', '+', 'R', 'S', '~', 'H', '`', '?']
        self.alphabet = alphabet

    def decodeKey(self):
        fixedKey = ""
        for x in range(len(self.oldKey)):
            a = self.oldKey[int(x)]
            if a == '0':
                fixedKey += "0"
            elif a == '1':
                fixedKey += "1"
            else:
                for y in range(int(self.oldKey[int(x)]) - 1): #4
                    fixedKey += self.oldKey[int(x) + 1]
        self.key = fixedKey

    def createEncryption(self): #creates a code from key
        with open("config.json", "r") as f:
            oec = json.load(f)["list"]
            ec = []
            for x in range(len(self.key)):
                v = self.key[int(x)]
                if v == "0":
                    if [oec[int(x)][0], oec[int(x)][1]] not in ec:
                        ec.append([oec[int(x)][0], oec[int(x)][1]])
                    else:
                        ec.append([oec[int(x)][1], oec[int(x)][0]])
                elif v == "1":
                    if [oec[int(x)][1], oec[int(x)][0]] not in ec:
                        ec.append([oec[int(x)][1], oec[int(x)][0]])
                    else:
                        ec.append([oec[int(x)][0], oec[int(x)][1]])
            self.ec = ec

    def createCypher(self):
        aligned = []
        for x in range(len(self.ec)):
            if x % 2 == 0:
                aligned.append([self.ec[int(x)]] + [self.ec[int(x) + 1]])
        self.aligned = aligned

    def decode(self, phrase):
        decrypted = ""
        for x in range(len(phrase)):
            if x % 2 == 0:
                index = [phrase[int(x)], phrase[int(x) + 1]]
                for y in range(len(self.aligned)):
                    if index in self.aligned[y]:
                        decrypted += self.alphabet[y]
                        break

        return decrypted

dc = Decoder()
with open("encoded.ecdc", "r") as f:
    phrase = f.read()
    print(dc.decode(phrase))