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o ;jk* � @ s� d dl mZ d dlmZ d dlmZmZmZmZm Z m Z m Z m Z m Z edd�Zdd� ZG dd � d e�Zd d � Zd d � ZdZdZdS )� )�get_random_bytes)� _copy_bytes) �load_pycryptodome_raw_lib�create_string_buffer�get_raw_buffer� VoidPointer� SmartPointer�c_size_t� c_uint8_ptr�c_ulong�is_writeable_bufferzCryptodome.Cipher._chacha20a� int chacha20_init(void **pState, const uint8_t *key, size_t keySize, const uint8_t *nonce, size_t nonceSize); int chacha20_destroy(void *state); int chacha20_encrypt(void *state, const uint8_t in[], uint8_t out[], size_t len); int chacha20_seek(void *state, unsigned long block_high, unsigned long block_low, unsigned offset); int hchacha20( const uint8_t key[32], const uint8_t nonce16[16], uint8_t subkey[32]); c C sV t | �dksJ �t |�dksJ �td�}t�t| �t|�t|��}|r)td| ��|S )N� � z,Error %d when deriving subkey with HChaCha20)�len� bytearray�_raw_chacha20_libZ hchacha20r � ValueError)�key�nonceZsubkey�result� r �N/opt/saltstack/salt/lib/python3.10/site-packages/Cryptodome/Cipher/ChaCha20.py� _HChaCha20C s � r c @ s@ e Zd ZdZdZdd� Zddd�Zdd � Zdd d �Zd d � Z dS )�ChaCha20Cipherz�ChaCha20 (or XChaCha20) cipher object. Do not create it directly. Use :py:func:`new` instead. :var nonce: The nonce with length 8, 12 or 24 bytes :vartype nonce: bytes � c C s� t dd|�| _t|�dkr"t||dd� �}d|dd� }d| _nd| _| j}d| _t� | _t� | j� � t |�t t|��|t t|���}|rPt d|| jf ��t| j�� tj�| _dS ) z\Initialize a ChaCha20/XChaCha20 cipher object See also `new()` at the module level.N� r � Z XChaCha20ZChaCha20)�encrypt�decryptz"Error %d instantiating a %s cipher)r r r r �_name�_nextr �_stater Z chacha20_initZ address_ofr r r r �getZchacha20_destroy)�selfr r r r r r �__init__] s. �� �zChaCha20Cipher.__init__Nc C s$ d| j vr td��d| _ | �||�S )a� Encrypt a piece of data. Args: plaintext(bytes/bytearray/memoryview): The data to encrypt, of any size. Keyword Args: output(bytes/bytearray/memoryview): The location where the ciphertext is written to. If ``None``, the ciphertext is returned. Returns: If ``output`` is ``None``, the ciphertext is returned as ``bytes``. Otherwise, ``None``. r z-Cipher object can only be used for decryption)r )r � TypeError�_encrypt)r# � plaintext�outputr r r r } s zChaCha20Cipher.encryptc C s� |du r t t|��}n|}t|�std��t|�t|�kr%tdt|� ��t�| j�� t |�t |�t t|���}|rCtd|| j f ��|du rKt |�S dS )zEncrypt without FSM checksNz4output must be a bytearray or a writeable memoryviewz9output must have the same length as the input (%d bytes)z!Error %d while encrypting with %s) r r r r% r r Zchacha20_encryptr! r" r r r r )r# r' r( � ciphertextr r r r r& � s( � �zChaCha20Cipher._encryptc C sT d| j vr td��d| _ z| �||�W S ty) } z tt|��dd���d}~ww )a� Decrypt a piece of data. Args: ciphertext(bytes/bytearray/memoryview): The data to decrypt, of any size. Keyword Args: output(bytes/bytearray/memoryview): The location where the plaintext is written to. If ``None``, the plaintext is returned. Returns: If ``output`` is ``None``, the plaintext is returned as ``bytes``. Otherwise, ``None``. r z-Cipher object can only be used for encryption)r �enc�decN)r r% r& r �str�replace)r# r) r( �er r r r � s ��zChaCha20Cipher.decryptc C sV t |d�\}}|d@ }|d? }t�| j�� t|�t|�|�}|r)td|| jf ��dS )a Seek to a certain position in the key stream. If you want to seek to a certain block, use ``seek(block_number * 64)``. Args: position (integer): The absolute position within the key stream, in bytes. �@ l �� r z Error %d while seeking with %sN)�divmodr Z chacha20_seekr! r" r r r )r# �positionZ block_number�offsetZ block_lowZ block_highr r r r �seek� s ��zChaCha20Cipher.seek)N) �__name__� __module__� __qualname__�__doc__� block_sizer$ r r& r r3 r r r r r S s r c C s� t | �dkr td��|du rtd� }}nt |�dkr d| }n t |�dkr)|}ntd��t| |d��d �}|dd � |d d� |fS ) zrDerive a tuple (r, s, nonce) for a Poly1305 MAC. If nonce is ``None``, a new 12-byte nonce is generated. r z-Poly1305 with ChaCha20 requires a 32-byte keyN� � r z6Poly1305 with ChaCha20 requires an 8- or 12-byte nonce)r r s r )r r r �newr )r r Z padded_nonceZrsr r r �_derive_Poly1305_key_pair� s r< c K s� z| � d�}W n ty } ztd| ��d}~ww | � dd�}|du r(td�}t|�dkr2td��t|�dvr<td ��| rFtd t| � ��t||�S ) a� Create a new ChaCha20 or XChaCha20 cipher Keyword Args: key (bytes/bytearray/memoryview): The secret key to use. It must be 32 bytes long. nonce (bytes/bytearray/memoryview): A mandatory value that must never be reused for any other encryption done with this key. For ChaCha20, it must be 8 or 12 bytes long. For XChaCha20, it must be 24 bytes long. If not provided, 8 bytes will be randomly generated (you can find them back in the ``nonce`` attribute). :Return: a :class:`Cryptodome.Cipher.ChaCha20.ChaCha20Cipher` object r zMissing parameter %sNr r: r z,ChaCha20/XChaCha20 key must be 32 bytes long)r: r9 r z:Nonce must be 8/12 bytes(ChaCha20) or 24 bytes (XChaCha20)zUnknown parameters: )�pop�KeyErrorr% r r r r, r )�kwargsr r. r r r r r; � s �� r; r r N)ZCryptodome.Randomr ZCryptodome.Util.py3compatr ZCryptodome.Util._raw_apir r r r r r r r r r r �objectr r< r; r8 Zkey_sizer r r r �<module> s ,� )
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