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Returns a human-readable string of all violations or `None``.
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See :doc:`parameters` on how to pick them.
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Attributes:
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type: Hash type.
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version: Argon2 version.
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salt_len: Length of the salt in bytes.
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hash_len: Length of the hash in bytes.
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time_cost: Time cost in iterations.
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memory_cost: Memory cost in kibibytes.
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parallelism: Number of parallel threads.
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.. versionadded:: 18.2.0
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Extract parameters from an encoded *hash*.
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hash: An encoded Argon2 hash string.
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Returns:
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The parameters used to create the hash.
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.. versionadded:: 18.2.0
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