33 lines
777 B
Python
33 lines
777 B
Python
"""
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Fallback expressions help PyBitmessage modules to run without some external
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dependencies.
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RIPEMD160Hash
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-------------
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We need to check :mod:`hashlib` for RIPEMD-160, as it won't be available
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if OpenSSL is not linked against or the linked OpenSSL has RIPEMD disabled.
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Try to use `pycryptodome <https://pypi.org/project/pycryptodome/>`_
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in that case.
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"""
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import hashlib
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try:
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hashlib.new('ripemd160')
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except ValueError:
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try:
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from Crypto.Hash import RIPEMD160
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except ImportError:
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RIPEMD160Hash = None
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else:
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RIPEMD160Hash = RIPEMD160.new
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else:
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def RIPEMD160Hash(data=None):
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"""hashlib based RIPEMD160Hash"""
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hasher = hashlib.new('ripemd160')
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if data:
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hasher.update(data)
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return hasher
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