mirror of
https://github.com/LonamiWebs/Telethon.git
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74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
"""Various helpers not related to the Telegram API itself"""
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from hashlib import sha1, sha256
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import os
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# region Multiple utilities
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def generate_random_long(signed=True):
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"""Generates a random long integer (8 bytes), which is optionally signed"""
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return int.from_bytes(os.urandom(8), signed=signed, byteorder='little')
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def ensure_parent_dir_exists(file_path):
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"""Ensures that the parent directory exists"""
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parent = os.path.dirname(file_path)
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if parent:
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os.makedirs(parent, exist_ok=True)
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# endregion
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# region Cryptographic related utils
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def calc_key(shared_key, msg_key, client):
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"""Calculate the key based on Telegram guidelines,
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specifying whether it's the client or not
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"""
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x = 0 if client else 8
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sha1a = sha1(msg_key + shared_key[x:x + 32]).digest()
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sha1b = sha1(shared_key[x + 32:x + 48] + msg_key +
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shared_key[x + 48:x + 64]).digest()
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sha1c = sha1(shared_key[x + 64:x + 96] + msg_key).digest()
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sha1d = sha1(msg_key + shared_key[x + 96:x + 128]).digest()
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key = sha1a[0:8] + sha1b[8:20] + sha1c[4:16]
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iv = sha1a[8:20] + sha1b[0:8] + sha1c[16:20] + sha1d[0:8]
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return key, iv
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def calc_msg_key(data):
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"""Calculates the message key from the given data"""
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return sha1(data).digest()[4:20]
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def generate_key_data_from_nonce(server_nonce, new_nonce):
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"""Generates the key data corresponding to the given nonce"""
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hash1 = sha1(bytes(new_nonce + server_nonce)).digest()
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hash2 = sha1(bytes(server_nonce + new_nonce)).digest()
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hash3 = sha1(bytes(new_nonce + new_nonce)).digest()
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key = hash1 + hash2[:12]
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iv = hash2[12:20] + hash3 + new_nonce[:4]
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return key, iv
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def get_password_hash(pw, current_salt):
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"""Gets the password hash for the two-step verification.
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current_salt should be the byte array provided by
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invoking GetPasswordRequest()
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"""
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# Passwords are encoded as UTF-8
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# At https://github.com/DrKLO/Telegram/blob/e31388
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# src/main/java/org/telegram/ui/LoginActivity.java#L2003
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data = pw.encode('utf-8')
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pw_hash = current_salt + data + current_salt
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return sha256(pw_hash).digest()
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# endregion
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