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o ;j� � @ sn d dl mZ d dlmZmZmZmZmZmZm Z m Z d dl m Z edd�Z G dd� d�Zd d d �Zd Zd ZdS )� )� _copy_bytes)�load_pycryptodome_raw_lib�create_string_buffer�get_raw_buffer� VoidPointer� SmartPointer�c_size_t� c_uint8_ptr�is_writeable_buffer)�get_random_byteszCryptodome.Cipher._Salsa20a� int Salsa20_stream_init(uint8_t *key, size_t keylen, uint8_t *nonce, size_t nonce_len, void **pSalsaState); int Salsa20_stream_destroy(void *salsaState); int Salsa20_stream_encrypt(void *salsaState, const uint8_t in[], uint8_t out[], size_t len); c @ s, e Zd ZdZdd� Zd dd�Zd dd�ZdS ) � Salsa20Cipherz�Salsa20 cipher object. Do not create it directly. Use :py:func:`new` instead. :var nonce: The nonce with length 8 :vartype nonce: byte string c C s� t |�tvrtdt |� ��t |�dkr tdt |� ��tdd|�| _t� | _t�t |�t t |��t |�t t |��| j� � �}|rEtd��t | j� � tj�| _d| _t |�| _dS )zQInitialize a Salsa20 cipher object See also `new()` at the module level.z+Incorrect key length for Salsa20 (%d bytes)� z-Incorrect nonce length for Salsa20 (%d bytes)Nz'Error %d instantiating a Salsa20 cipher� )�len�key_size� ValueErrorr �noncer �_state�_raw_salsa20_libZSalsa20_stream_initr r Z address_ofr �getZSalsa20_stream_destroy� block_size)�self�keyr �result� r �M/opt/saltstack/salt/lib/python3.10/site-packages/Cryptodome/Cipher/Salsa20.py�__init__6 s, � � �zSalsa20Cipher.__init__Nc C s� |du r t t|��}n|}t|�std��t|�t|�kr%tdt|� ��t�| j�� t |�t |�t t|���}|r@td| ��|du rHt |�S dS )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``. Nz4output must be a bytearray or a writeable memoryviewz9output must have the same length as the input (%d bytes)z&Error %d while encrypting with Salsa20) r r r � TypeErrorr r ZSalsa20_stream_encryptr r r r r )r Z plaintext�output� ciphertextr r r r �encryptS s( � � zSalsa20Cipher.encryptc C s> z| j ||d�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 �enc�decN)r r �str�replace)r r r �er r r �decrypty s ��zSalsa20Cipher.decrypt�N)�__name__� __module__� __qualname__�__doc__r r r& r r r r r . s &r Nc C s |du rt d�}t| |�S )a) Create a new Salsa20 cipher :keyword key: The secret key to use. It must be 16 or 32 bytes long. :type key: bytes/bytearray/memoryview :keyword nonce: A value that must never be reused for any other encryption done with this key. It must be 8 bytes long. If not provided, a random byte string will be generated (you can read it back via the ``nonce`` attribute of the returned object). :type nonce: bytes/bytearray/memoryview :Return: a :class:`Cryptodome.Cipher.Salsa20.Salsa20Cipher` object Nr )r r )r r r r r �new� s r, r )� � r' )ZCryptodome.Util.py3compatr ZCryptodome.Util._raw_apir r r r r r r r ZCryptodome.Randomr r r r, r r r r r r �<module> s ( � ^
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