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Document the crypto/ module

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Lonami Exo
2017-11-26 16:57:40 +01:00
parent 74ec6391d9
commit a932fb6470
8 changed files with 142 additions and 21 deletions
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20
telethon/crypto/rsa.py
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@@ -1,3 +1,6 @@
"""
This module holds several utilities regarding RSA and server fingerprints.
"""
import os
import struct
from hashlib import sha1
@@ -32,8 +35,11 @@ def get_byte_array(integer):
def _compute_fingerprint(key):
"""For a given Crypto.RSA key, computes its 8-bytes-long fingerprint
in the same way that Telegram does.
"""
Given a RSA key, computes its fingerprint like Telegram does.
:param key: the Crypto.RSA key.
:return: its 8-bytes-long fingerprint.
"""
n = TLObject.serialize_bytes(get_byte_array(key.n))
e = TLObject.serialize_bytes(get_byte_array(key.e))
@@ -49,8 +55,14 @@ def add_key(pub):
def encrypt(fingerprint, data):
"""Given the fingerprint of a previously added RSA key, encrypt its data
in the way Telegram requires us to do so (sha1(data) + data + padding)
"""
Encrypts the given data known the fingerprint to be used
in the way Telegram requires us to do so (sha1(data) + data + padding)
:param fingerprint: the fingerprint of the RSA key.
:param data: the data to be encrypted.
:return:
the cipher text, or None if no key matching this fingerprint is found.
"""
global _server_keys
key = _server_keys.get(fingerprint, None)