99 lines
3.0 KiB
Python
99 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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import mtproto
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import os
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import io
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import prime
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import struct
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from Crypto.Cipher import AES
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# Deal with py2 and py3 differences
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try:
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import configparser
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except ImportError:
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import ConfigParser as configparser
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from Crypto.Hash import SHA
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from Crypto.PublicKey import RSA
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from Crypto.Cipher import AES
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config = configparser.ConfigParser()
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# Check if credentials is correctly loaded (when it doesn't read anything it returns [])
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if not config.read('credentials'):
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print("File 'credentials' seems to not exist.")
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exit(-1)
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ip = config.get('App data', 'ip_address')
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port = config.getint('App data', 'port')
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Session = mtproto.Session(ip, port)
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client_nonce = os.urandom(16)
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x = Session.method_call('req_pq', nonce=client_nonce)
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server_nonce = x['server_nonce']
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public_key_fingerprint = x['server_public_key_fingerprints'][0]
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PQ_bytes = x['pq']
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# doing len(PQ_bytes) I saw it was 8 bytes, so we unpack with Q
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# as in the docs: https://docs.python.org/2/library/struct.html
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PQ = struct.unpack('>q', PQ_bytes)[0]
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[p, q] = prime.primefactors(PQ)
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if p > q: (p, q) = (q, p)
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assert p*q == PQ and p < q
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print("PQ = %d\np = %d, q = %d" % (PQ, p, q))
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P_bytes = struct.pack('>i', p)
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Q_bytes = struct.pack('>i', q)
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# print("p.bit_length()//8+1: " + str(p.bit_length()//8+1)) # 4
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# print("q.bit_length()//8+1: " + str(q.bit_length()//8+1)) # 4
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# P_bytes = int.to_bytes(p, p.bit_length()//8+1, 'big')
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# Q_bytes = int.to_bytes(q, q.bit_length()//8+1, 'big')
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f = open('rsa.pub', 'r')
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key = RSA.importKey(f.read())
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z = io.BytesIO()
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new_nonce = os.urandom(32)
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mtproto.serialize_obj(z, 'p_q_inner_data',
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pq=PQ_bytes,
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p=P_bytes,
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q=Q_bytes,
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nonce=client_nonce,
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server_nonce=server_nonce,
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new_nonce=new_nonce)
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data = z.getvalue()
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sha_digest = SHA.new(data).digest()
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random_bytes = os.urandom(255-len(data)-len(sha_digest))
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to_encrypt = sha_digest + data + random_bytes
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encrypted_data = key.encrypt(to_encrypt, 0)[0]
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z = Session.method_call('req_DH_params',
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nonce=client_nonce, # 16 bytes
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server_nonce=server_nonce,
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p=P_bytes,
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q=Q_bytes,
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public_key_fingerprint=public_key_fingerprint,
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encrypted_data=encrypted_data)
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encrypted_answer = z['encrypted_answer']
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print("encrypted_answer:")
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print(encrypted_answer.__repr__())
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tmp_aes_key = SHA.new(new_nonce + server_nonce).digest() + SHA.new(server_nonce + new_nonce).digest()[0:12]
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tmp_aes_iv = SHA.new(server_nonce + new_nonce).digest()[12:20] + SHA.new(new_nonce + new_nonce).digest() + new_nonce[0:4]
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print("\ntmp_aes_key:")
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mtproto.vis(tmp_aes_key)
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print(tmp_aes_key.__repr__())
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print("\ntmp_aes_iv:")
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mtproto.vis(tmp_aes_iv)
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print(tmp_aes_iv.__repr__())
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from ige import ige
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decrypted_answer = ige(encrypted_answer, tmp_aes_key, tmp_aes_iv)
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print("decrypted_answer is:")
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print(decrypted_answer.__repr__())
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mtproto.vis(decrypted_answer[20:]) # To start off BA0D89 ...
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