Decrypt Supercell Clash Royale XML files

decrypt.py

from Crypto.Cipher import AES
import base64
import hashlib
import xml.etree.ElementTree
import sys

package_name = "com.supercell.clashroyale"


def build_storage_new_key():
    key_map = [102, 76, 120, 89, 66, 57, 77, 56, 52, 65, 98, 101, 117, 115, 69, 82, 77, 89, 57, 89, 70, 122, 86, 71]
    out = ""

    for i1 in range(len(package_name) - 1, -1, -1):
        i2 = ord(package_name[i1])
        i3 = key_map[i1 % 24]
        out += chr((((i2 ^ i3) & 0x1F) + 48))

    return out


class AESCipher:
    def __init__(self, key, mode):
        self.bs = 16
        self.mode = mode
        self.key = hashlib.sha256(key.encode()).digest()
        self.iv_key = False
        if mode == AES.MODE_CBC:
            self.iv_key = b'fldsjfodasjifudslfjdsaofshaufihadsf'[0:self.bs]

    def decrypt(self, crypted):
        crypted = base64.b64decode(crypted)
        cipher = AES.new(self.key, self.mode, self.iv_key) if self.iv_key else AES.new(self.key, self.mode)
        return self.unpad(cipher.decrypt(crypted)).decode('utf-8')

    def unpad(self, s):
        return s[:-ord(s[len(s) - 1:])]


if __name__ == "__main__":
    if len(sys.argv) > 1:
        file = sys.argv[1]
        if file == "storage.xml" or file == 'localPrefs.xml':
            if len(sys.argv) == 2:
                print(
                    "[X] The " + file + " key is your androidId, please provide it when running the script: python decrypt.py storage.xml androidId")
                sys.exit(0)
            else:
                key = sys.argv[2]
        else:
            key = build_storage_new_key()
            if file != "storage_new.xml":
                print("[!] Couldn't determine filetype. Using storage_new.xml key.")
    else:
        print("No file specified")
        sys.exit(0)

print("[*] Using key " + key)
try:
    file = xml.etree.ElementTree.parse(file).getroot()
except FileNotFoundError:
    print("File not found")
    sys.exit(0)

for entry in file.findall('string'):
    key_stream = AESCipher(key, AES.MODE_ECB)
    value_stream = AESCipher(key, AES.MODE_CBC)
    decrypted_key = key_stream.decrypt(entry.get('name'))
    decrypted_string = value_stream.decrypt(entry.text)
    print("[+] " + decrypted_key + "=" + decrypted_string)