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a c�h* � @ 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 |�dks J �td�}t�t| �t|�t|��}|rRtd| ��|S )N� � z,Error %d when deriving subkey with HChaCha20)�len� bytearray�_raw_chacha20_libZ hchacha20r � ValueError)�key�nonce�subkey�result� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/Cryptodome/Cipher/ChaCha20.py� _HChaCha20B 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 |�dkr6t||dd� �}d|dd� }d| _nd| _tdd|�| _| j| jf| _t� | _ t � | j � � t |�tt |��| jtt |���}|r�td|| jf ��t| j �� t j�| _ dS )z\Initialize a ChaCha20/XChaCha20 cipher object See also `new()` at the module level.� Nr � Z XChaCha20ZChaCha20z"Error %d instantiating a %s cipher)r r �_namer r �encrypt�decrypt�_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* | j | jvrtd��| j f| _| �||�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``. 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 rt t|��}n4|}t|�s*td��t|�t|�krJtdt|� ��t�| j�� t |�t |�t t|���}|r�td|| j f ��|du r�t |�S dS 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 sj | j | jvrtd��| j f| _z| �||�W S tyd } z tt|��dd���W Y d}~n d}~0 0 dS )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``. z-Cipher object can only be used for encryption�enc�decN)r 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|�|�}|rRtd|| jf ��dS )z�Seek to a certain position in the key stream. 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$ �position�offsetZ block_lowZ block_highr r r r �seek� s �zChaCha20Cipher.seek)N)N) �__name__� __module__� __qualname__�__doc__� block_sizer% r r' r r4 r r r r r R s r c C s� t | �dkrtd��|du r*td� }}n0t |�dkr@d| }nt |�dkrR|}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_nonce�rsr r r �_derive_Poly1305_key_pair� s r> c K s� z| � d�}W n0 ty> } ztd| ��W Y d}~n d}~0 0 | � dd�}|du r\td�}t|�dkrptd��t|�dvr�td ��| r�td 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; r: 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< r9 Zkey_sizer r r r �<module> s ,� )
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