The number of iterations should be chosen based on the hash algorithm andĬomputing power. salt should be about 16 or more bytes from Applications and libraries should limit password toĪ sensible length (e.g. password and salt are interpreted asīuffers of bytes. The string hash_name is the desired name of the hash digest algorithm for The function provides PKCS#5 password-based key derivation function 2. pbkdf2_hmac ( hash_name, password, salt, iterations, dklen = None ) ¶ A good password hashing function must be tunable, slow, and Naive algorithms such as sha1(password) are not resistant againstīrute-force attacks. Key derivation and key stretching algorithms are designed for secure password It is up toĭigest must either be a hash algorithm name as a str, a hashĬonstructor, or a callable that returns a hash object.

In an unknown state after this function returns or raises. The function may bypass Python’s I/O and use the file descriptorįrom fileno() directly. It accepts file objects from builtin open(), BytesIO Return a digest object that has been updated with contents of file object.įileobj must be a file-like object opened for reading in binary mode. The hashlib module provides a helper function for efficient hashing ofĪ file or file-like object. hexdigest ( length ) ¶Įxchange the value safely in email or other non-binary environments. This is a bytes object of size length which may contain bytes in Maximum length is not limitedīy the SHAKE algorithm. Length digests with length_in_bits//2 up to 128 or 256 bits of security.Īs such, their digest methods require a length. The shake_128() and shake_256() algorithms provide variable This can be used to efficientlyĬompute the digests of data sharing a common initial substring. Return a copy (“clone”) of the hash object. This may be used toĮxchange the value safely in email or other non-binary environments.

Like digest() except the digest is returned as a string object ofĭouble length, containing only hexadecimal digits. This is a bytes object of size digest_size which may contain bytes in Return the digest of the data passed to the update() method so far. Updates on data larger than 2047 bytes is taking place when using hashĪlgorithms supplied by OpenSSL. Changed in version 3.1: The Python GIL is released to allow other threads to run while hash

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