;Si`dZddlmZddlmZmZddlmZmZddl m Z ddl m Z Gdd Z y ) z3 This module holds the CdnDecrypter utility class. )sha256)GetCdnFileRequestReuploadCdnFileRequest)CdnFileReuploadNeededCdnFile) AESModeCTR)CdnFileTamperedErrorc<eZdZdZdZedZdZedZy) CdnDecrypterz Used when downloading a file results in a 'FileCdnRedirect' to both prepare the redirect, decrypt the file as it downloads, and ensure the file hasn't been tampered. https://core.telegram.org/cdn c<||_||_||_||_y)a. Initializes the CDN decrypter. :param cdn_client: a client connected to a CDN. :param file_token: the token of the file to be used. :param cdn_aes: the AES CTR used to decrypt the file. :param cdn_file_hashes: the hashes the decrypted file must match. N)client file_tokencdn_aescdn_file_hashes)self cdn_clientrrrs a/var/www/OnlineNewsSite/project/venv/lib/python3.12/site-packages/telethon/crypto/cdndecrypter.py__init__zCdnDecrypter.__init__s!! $ .cKt|j|jddtdz}t ||j ||j }|t|j |j dj|j djd{}t|trC|t|j |jd{|j}||fS|jj!|j|_|j j#d}|j%|j|||fS77w)a9 Prepares a new CDN decrypter. :param client: a TelegramClient connected to the main servers. :param cdn_client: a new client connected to the CDN. :param cdn_redirect: the redirect file object that caused this call. :return: (CdnDecrypter, first chunk file data) N )keyivr)roffsetlimit)r request_token)r encryption_key encryption_ivbytesr rrrrr isinstancerrrget_filerencryptpopcheck)rr cdn_redirectr decryptercdn_filecdn_hashs rprepare_decrypterzCdnDecrypter.prepare_decrypter sR++))#2.q9 !  // \11 $$5#..//299..q177%    h 5 6/'22&44   !))+H ("" '..66x~~FHN 0044Q7H OOHNNH 5(""'  s%B"E%$E!%>E%#E#$A>E%#E%c|jr|jjd}|jt|j|j |j }|jj|j|_ |j|j||Sttd}|S)z Calls GetCdnFileRequest and decrypts its bytes. Also ensures that the file hasn't been tampered. :return: the CdnFile result. r) rr%rrrrrrr$r!r&r)rr*r)s rr#zCdnDecrypter.get_fileLs   ++//2H{{#4(..$H"\\11(..AHN JJx~~x 0uQx(Hrcdt|j|jk7r ty)z Checks the integrity of the given data. Raises CdnFileTamperedError if the integrity check fails. :param data: the data to be hashed. :param cdn_hash: the expected hash. N)rdigesthashr )datar*s rr&zCdnDecrypter.check_s+ $<   HMM 1&( ( 2rN) __name__ __module__ __qualname____doc__r staticmethodr+r#r&rrr r s: /)#)#V& ) )rr N)r4hashlibrtl.functions.uploadrrtl.types.uploadrrcryptor errorsr r r6rrr<s'K<)])])r