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This specific algorithm is used for encrypting/decrypting private key files. :param function hash_alg: A function which creates a new hash object, such as ``hashlib.sha256``. :param salt: data to salt the hash with. :type bytes salt: Hash salt bytes. :param str key: human-entered password or passphrase. :param int nbytes: number of bytes to generate. :return: Key data, as `bytes`. r Nr )r r �updater= �digest�min)�hash_alg�salt�key�nbytes�keydatarL �hash_obj�sizer r r �generate_key_bytes� s � rU c C s ddl m} || �S )a� Read a file of known SSH host keys, in the format used by openssh, and return a compound dict of ``hostname -> keytype ->`` `PKey <paramiko.pkey.PKey>`. The hostname may be an IP address or DNS name. The keytype will be either ``"ssh-rsa"`` or ``"ssh-dss"``. This type of file unfortunately doesn't exist on Windows, but on posix, it will usually be stored in ``os.path.expanduser("~/.ssh/known_hosts")``. Since 1.5.3, this is just a wrapper around `.HostKeys`. :param str filename: name of the file to read host keys from :return: nested dict of `.PKey` objects, indexed by hostname and then keytype r )�HostKeys)�paramiko.hostkeysrV )�filenamerV r r r �load_host_keys� s rY c C s t � }|�| � |S )z� Provided only as a backward-compatible wrapper around `.SSHConfig`. .. deprecated:: 2.7 Use `SSHConfig.from_file` instead. )r �parse)�file_obj�configr r r �parse_ssh_config� s r] c C s |� | �S )zM Provided only as a backward-compatible wrapper around `.SSHConfig`. )�lookup)�hostnamer\ r r r �lookup_ssh_host_config� s r` c C s� dd|}}}dd| }}}|dkr7|| }|||| }}|||| }}|||| }}|dks|dk r?||7 }|S )Nr r r ) r/ �m�u1�u2�u3�v1�v2�v3�qr r r � mod_inverse� s �ri c C sT zt jW S ty) t� td7 att _W d � n1 s w Y t j Y S w )Nr )�_g_thread_data�idr@ �_g_thread_lock�_g_thread_counterr r r r � get_thread_id� s � �rn c C sf t �d�}t|j�dkrdS |�|� t| d�}t �|�}d}|d7 }|�t �|d�� |� |� dS )zKsend paramiko logs to a logfile, if they're not already going somewhere�paramikor N�az>%(levelname)-.3s [%(asctime)s.%(msecs)03d] thr=%(_threadid)-3dz %(name)s: %(message)sz%Y%m%d-%H:%M:%S) �logging� getLoggerr �handlers�setLevel�open� StreamHandler� setFormatter� Formatter� addHandler)rX �level�logger�f�handler�frmr r r � log_to_file� s r c @ s e Zd Zdd� ZdS )�PFilterc C s t � |_dS )NT)rn � _threadid)�self�recordr r r �filter s zPFilter.filterN)�__name__� __module__� __qualname__r� r r r r r� s r� c C s t �| �}|�t� |S �N)rq rr � addFilter�_pfilter)�namer{ r r r � get_logger s r� c C sN t | �t |�kr dS d}tt | ��D ]}|t| | �t|| �A O }q|dkS )NFr )r r r )rp r= �resr r r r �constant_time_bytes_eq s r� c @ s e Zd Zdd� Zdd� ZdS )�ClosingContextManagerc C s | S r� r )r� r r r � __enter__ s z ClosingContextManager.__enter__c C s | � � d S r� )�close)r� �type�valuerE r r r �__exit__! s z ClosingContextManager.__exit__N)r� r� r� r� r� r r r r r� s r� c C s t | t||��S r� )�maxrM )�minimum�val�maximumr r r � clamp_value% s r� c C sD zt | �W S ty! z| �� W Y S ty | Y Y S w w )z: Coerce to bytes if possible or return unchanged. )r= � TypeError�asbytesr@ )r r r r r� ) s ��r� �utf8c C s4 t | t�r| S t | t�r| �|�S tdt| �� ���)z cast unicode or bytes to bytes� Expected unicode or bytes, got )� isinstancer �str�encoder� r� �r �encodingr r r r= ? s r= c C s4 t | t�r | �|�S t | t�r| S tdt| �� ���)z cast bytes or unicode to unicoder� )r� r �decoder� r� r� r� r r r �uJ s r� )F)T)r% )r� )+�__doc__rG r rE � threadingrq �paramiko.commonr r r r r r �paramiko.configr r r$ r0 r- r> r? rJ rU rY r] r` ri �localrj rm �Lockrl rn r r� r� r� r� r� r� r� r= r� r r r r �<module> sD
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