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Cs(tt|tdtjdt|}t|tkdttjdtt|tpJ|dkdtjdtt|tolt|t kdt tjdtt|tot|t kdt tjd|t }t d}t d |}|r|}t|} n t j}d } t||t j|||| || } t| d kd tjdt ||d ddS) aR Decrypt the given ``ciphertext`` using the IETF ratified chacha20poly1305 construction described in RFC7539. :param ciphertext: :type ciphertext: bytes :param aad: :type aad: Optional[bytes] :param nonce: :type nonce: bytes :param key: :type key: bytes :return: message :rtype: bytes #Input ciphertext type must be bytesr(Ciphertext must be at most {} bytes longNrrr r!r"rDecryption failed.)rr$r%r&r'r(*_aead_chacha20poly1305_ietf_CRYPTBYTES_MAXr)r*r rr rr,r+r)crypto_aead_chacha20poly1305_ietf_decryptr.r/ r6rrrr5r4r1rr2r3r7r8r8r9r>sn         r>c Cs0tt|tdtjdt|}t|tkdttjdtt|tpJ|dkdtjdtt|tolt|t kdt tjdtt|tot|t kdt tjd|r|}t|}n t j }d}t|}|t }t d }t d |} t| |||||t j || } t| dkd tjdt | |dddS) a[ Encrypt the given ``message`` using the "legacy" construction described in draft-agl-tls-chacha20poly1305. :param message: :type message: bytes :param aad: :type 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given ``message`` using the long-nonces xchacha20poly1305 construction. :param message: :type message: bytes :param aad: :type aad: Optional[bytes] :param nonce: :type nonce: bytes :param key: :type key: bytes :return: authenticated ciphertext :rtype: bytes rrrNrrr rr!r"r#)rr$r%r&r'r(rr)r*rrrr+rr,r*crypto_aead_xchacha20poly1305_ietf_encryptr.r/r0r8r8r9rCsp         rCc Cs(tt|tdtjdt|}t|tkdttjdtt|tpJ|dkdtjdtt|tolt|t kdt tjdtt|tot|t kdt tjd|t }t d}t d |}|r|}t|} n t j}d } t||t j|||| || } t| d kd tjdt ||d ddS) aU Decrypt the given ``ciphertext`` using the long-nonces xchacha20poly1305 construction. :param ciphertext: authenticated ciphertext :type ciphertext: bytes :param aad: :type aad: Optional[bytes] :param nonce: :type nonce: bytes :param key: :type key: bytes :return: message :rtype: bytes r:rr;Nrrr r!r"rr<)rr$r%r&r'r(+_aead_xchacha20poly1305_ietf_CRYPTBYTES_MAXr)r*rrrrr,r+r*crypto_aead_xchacha20poly1305_ietf_decryptr.r/r?r8r8r9rEsn         rEN)4typingrZnaclrr&Z 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