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41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
"""
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This module holds the AuthKey class.
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"""
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import struct
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from hashlib import sha1
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from ..extensions import BinaryReader
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class AuthKey:
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"""
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Represents an authorization key, used to encrypt and decrypt
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messages sent to Telegram's data centers.
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"""
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def __init__(self, data):
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"""
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Initializes a new authorization key.
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:param data: the data in bytes that represent this auth key.
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"""
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self.key = data
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with BinaryReader(sha1(self.key).digest()) as reader:
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self.aux_hash = reader.read_long(signed=False)
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reader.read(4)
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self.key_id = reader.read_long(signed=False)
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def calc_new_nonce_hash(self, new_nonce, number):
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"""
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Calculates the new nonce hash based on the current attributes.
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:param new_nonce: the new nonce to be hashed.
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:param number: number to prepend before the hash.
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:return: the hash for the given new nonce.
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"""
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new_nonce = new_nonce.to_bytes(32, 'little', signed=True)
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data = new_nonce + struct.pack('<BQ', number, self.aux_hash)
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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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