40 lines
1.7 KiB
Python
40 lines
1.7 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2020 Jim Bennett
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""Computes a derived symmetric key from a secret and a message
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:param str secret: The secret to use for the key
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:param str msg: The message to use for the key
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:returns: The derived symmetric key
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:rtype: bytes
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"""
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from .base64 import b64decode, b64encode
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from .hmac import new_hmac
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def compute_derived_symmetric_key(secret: str, msg: str) -> bytes:
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"""Computes a derived symmetric key from a secret and a message
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:param str secret: The secret to use for the key
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:param str msg: The message to use for the key
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:returns: The derived symmetric key
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:rtype: bytes
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"""
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return b64encode(new_hmac(b64decode(secret), msg=msg.encode("utf8")).digest())
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