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The work factor can be tuned by by picking different values for the parameters :param bytes passwd: :param bytes salt: :param bytes salt: *must* be *exactly* :py:const:`.SALTBYTES` long :param int dklen: :param int opslimit: :param int n: :param int r: block size, :param int p: the parallelism factor :param int maxmem: the maximum available memory available for scrypt's operations :rtype: bytes :raises nacl.exceptions.UnavailableError: If called when using a minimal build of libsodium. � Not available in minimal buildr. z uint8_t[]r �$Unexpected failure in key derivationr N)r �&has_crypto_pwhash_scryptsalsa208sha256r5 �UnavailableError� isinstance�int� TypeError�bytesr? r �newr �%crypto_pwhash_scryptsalsa208sha256_ll�len� RuntimeError�buffer�cast) rF rG r) r* r+ rH r, �buf�retr= r= r> rR s* � ��rR )rF r@ rA r- c C sP t tdtjd� t�dt�}t�|| t | �||�}t |dkdtj d� t� |�S )a� Derive a cryptographic key using the ``passwd`` and ``salt`` given as input, returning a string representation which includes the salt and the tuning parameters. The returned string can be directly stored as a password hash. See :py:func:`.crypto_pwhash_scryptsalsa208sha256` for a short discussion about ``opslimit`` and ``memlimit`` values. :param bytes passwd: :param int opslimit: :param int memlimit: :return: serialized key hash, including salt and tuning parameters :rtype: bytes :raises nacl.exceptions.UnavailableError: If called when using a minimal build of libsodium. rI r. �char[]r z&Unexpected failure in password hashing) r rK r5 rL r rQ �SCRYPT_STRBYTESr �&crypto_pwhash_scryptsalsa208sha256_strrS rT �string)rF r@ rA rW rX r= r= r> r[ E s � ��r[ )� passwd_hashrF r- c C sV t tdtjd� t t| �td kdtjd� t�| |t|��}t |dkdtj d� dS )a9 Verifies the ``passwd`` against the ``passwd_hash`` that was generated. Returns True or False depending on the success :param passwd_hash: bytes :param passwd: bytes :rtype: boolean :raises nacl.exceptions.UnavailableError: If called when using a minimal build of libsodium. rI r. r/ zInvalid password hashr �Wrong passwordT) r rK r5 rL rS rZ r6 r �-crypto_pwhash_scryptsalsa208sha256_str_verify�InvalidkeyError�r] rF rX r= r= r> r_ q s �� �r_ )r@ rA �algr- c C s� |t krn|tk r"t�d�t���n|tkr:t�d�t���| tk rTt�d�t���q�| tkr�t�d�t���nx|tkr�|t k r�t�d�t ���n|t kr�t�d�t ���| t k r�t�d�t ���q�| t kr�t�d�t ���n t� d��d S )Nz"memlimit must be at least {} bytesz!memlimit must be at most {} bytesz opslimit must be at least {}zopslimit must be at most {}zUnsupported algorithm)r r r5 r6 r8 r r r r r r r r rO )r@ rA rb r= r= r> �_check_argon2_limits_alg� sf ����������������rc )�outlenrF rG r@ rA rb r- c C s t t| t�tjd� t t|t�tjd� t t|t�tjd� t t|t�tjd� t t|t�tjd� t|�tkr�t�d� t���| t k r�t�d� t ���n| t kr�t�d� t ���t |||� t �d| �}t�|| |t|�||||�}t |dkdtjd� t �|| �dd� S ) a Derive a raw cryptographic key using the ``passwd`` and the ``salt`` given as input to the ``alg`` algorithm. :param outlen: the length of the derived key :type outlen: int :param passwd: The input password :type passwd: bytes :param salt: :type salt: bytes :param opslimit: computational cost :type opslimit: int :param memlimit: memory cost :type memlimit: int :param alg: algorithm identifier :type alg: int :return: derived key :rtype: bytes r. z"salt must be exactly {} bytes longz*derived key must be at least {} bytes longz)derived key must be at most {} bytes longzunsigned char[]r rJ N)r rM rN r5 rO rP rS r r6 r8 r r rc r rQ r Z crypto_pwhashrT rU )rd rF rG r@ rA rb �outbufrX r= r= r> �crypto_pwhash_alg� sD ������ ��rf )rF r@ rA rb r- c C s� t t|t�td� t t|t�td� t t| t�td� t|||� t�dd�}t� || t | �|||�}t |dkdt j d� t� |�S )a Derive a cryptographic key using the ``passwd`` given as input and a random salt, returning a string representation which includes the salt, the tuning parameters and the used algorithm. :param passwd: The input password :type passwd: bytes :param opslimit: computational cost :type opslimit: int :param memlimit: memory cost :type memlimit: int :param alg: The algorithm to use :type alg: int :return: serialized derived key and parameters :rtype: bytes r. rY r1 r rJ )r rM rN rO rP rc r rQ r �crypto_pwhash_str_algrS r5 rT r\ )rF r@ rA rb re rX r= r= r> rg s ��rg c C sf t t| t�td� t t|t�td� t t| �dkdtjd� t�| |t|��}t |dkdtj d� dS )a4 Verifies the ``passwd`` against a given password hash. Returns True on success, raises InvalidkeyError on failure :param passwd_hash: saved password hash :type passwd_hash: bytes :param passwd: password to be checked :type passwd: bytes :return: success :rtype: boolean r. � z#Hash must be at most 127 bytes longr r^ T) r rM rP rO rS r5 r6 r �crypto_pwhash_str_verifyr` ra r= r= r> ri = s �ri )�r: �typingr Znacl.exceptions� exceptionsr5 Z nacl._sodiumr r r �boolZ-PYNACL_HAS_CRYPTO_PWHASH_SCRYPTSALSA208SHA256rK Z,crypto_pwhash_scryptsalsa208sha256_STRPREFIXZ,crypto_pwhash_scryptsalsa208sha256_SALTBYTESZ+crypto_pwhash_scryptsalsa208sha256_STRBYTESZ-crypto_pwhash_scryptsalsa208sha256_PASSWD_MINZ-crypto_pwhash_scryptsalsa208sha256_PASSWD_MAXZ,crypto_pwhash_scryptsalsa208sha256_BYTES_MINZ,crypto_pwhash_scryptsalsa208sha256_BYTES_MAXZ/crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MINZ/crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MAXZ/crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MINZ/crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MAXZ7crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVEZ7crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVEZ5crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_SENSITIVEZ5crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_SENSITIVEr\ rV Z,crypto_pwhash_scryptsalsa208sha256_strprefixZ,crypto_pwhash_scryptsalsa208sha256_saltbytesZ+crypto_pwhash_scryptsalsa208sha256_strbytesZ-crypto_pwhash_scryptsalsa208sha256_passwd_minZ-crypto_pwhash_scryptsalsa208sha256_passwd_maxZ,crypto_pwhash_scryptsalsa208sha256_bytes_minZ,crypto_pwhash_scryptsalsa208sha256_bytes_maxZ/crypto_pwhash_scryptsalsa208sha256_memlimit_minZ/crypto_pwhash_scryptsalsa208sha256_memlimit_maxZ/crypto_pwhash_scryptsalsa208sha256_opslimit_minZ/crypto_pwhash_scryptsalsa208sha256_opslimit_maxZ7crypto_pwhash_scryptsalsa208sha256_opslimit_interactiveZ7crypto_pwhash_scryptsalsa208sha256_memlimit_interactiveZ5crypto_pwhash_scryptsalsa208sha256_opslimit_sensitiveZ5crypto_pwhash_scryptsalsa208sha256_memlimit_sensitiveZcrypto_pwhash_alg_argon2i13r rN �__annotations__Z crypto_pwhash_alg_argon2id13r Zcrypto_pwhash_alg_defaultr Zcrypto_pwhash_saltbytesr Zcrypto_pwhash_strbytesr Zcrypto_pwhash_passwd_minr Zcrypto_pwhash_passwd_maxr Zcrypto_pwhash_bytes_minr Zcrypto_pwhash_bytes_maxr Z crypto_pwhash_argon2i_strprefixr rP Z"crypto_pwhash_argon2i_memlimit_minr Z"crypto_pwhash_argon2i_memlimit_maxr Z"crypto_pwhash_argon2i_opslimit_minr Z"crypto_pwhash_argon2i_opslimit_maxr Z*crypto_pwhash_argon2i_opslimit_interactiver Z*crypto_pwhash_argon2i_memlimit_interactiver Z'crypto_pwhash_argon2i_opslimit_moderater Z'crypto_pwhash_argon2i_memlimit_moderater Z(crypto_pwhash_argon2i_opslimit_sensitiver Z(crypto_pwhash_argon2i_memlimit_sensitiver Z crypto_pwhash_argon2id_strprefixr Z#crypto_pwhash_argon2id_memlimit_minr Z#crypto_pwhash_argon2id_memlimit_maxr Z#crypto_pwhash_argon2id_opslimit_minr Z#crypto_pwhash_argon2id_opslimit_maxr Z+crypto_pwhash_argon2id_opslimit_interactiver! 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