58 lines
1.7 KiB
ReStructuredText
58 lines
1.7 KiB
ReStructuredText
:mod:`hashlib` -- hashing algorithms
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====================================
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.. module:: hashlib
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:synopsis: hashing algorithms
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|see_cpython_module| :mod:`python:hashlib`.
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This module implements binary data hashing algorithms. The exact inventory
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of available algorithms depends on a board. Among the algorithms which may
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be implemented:
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* SHA256 - The current generation, modern hashing algorithm (of SHA2 series).
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It is suitable for cryptographically-secure purposes. Included in the
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MicroPython core and any board is recommended to provide this, unless
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it has particular code size constraints.
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* SHA1 - A previous generation algorithm. Not recommended for new usages,
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but SHA1 is a part of number of Internet standards and existing
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applications, so boards targeting network connectivity and
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interoperability will try to provide this.
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* MD5 - A legacy algorithm, not considered cryptographically secure. Only
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selected boards, targeting interoperability with legacy applications,
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will offer this.
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Constructors
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------------
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.. class:: hashlib.sha256([data])
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Create an SHA256 hasher object and optionally feed ``data`` into it.
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.. class:: hashlib.sha1([data])
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Create an SHA1 hasher object and optionally feed ``data`` into it.
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.. class:: hashlib.md5([data])
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Create an MD5 hasher object and optionally feed ``data`` into it.
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Methods
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-------
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.. method:: hash.update(data)
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Feed more binary data into hash.
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.. method:: hash.digest()
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Return hash for all data passed through hash, as a bytes object. After this
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method is called, more data cannot be fed into the hash any longer.
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.. method:: hash.hexdigest()
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This method is NOT implemented. Use ``binascii.hexlify(hash.digest())``
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to achieve a similar effect.
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