mirror of
https://github.com/markqvist/Reticulum.git
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40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
# MIT License
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#
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# Copyright (c) 2022 Mark Qvist / unsigned.io
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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 all
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# 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 THE
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# SOFTWARE.
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class PKCS7:
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BLOCKSIZE = 16
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@staticmethod
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def pad(data, bs=BLOCKSIZE):
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l = len(data)
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n = bs-l%bs
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v = bytes([n])
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return data+v*n
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@staticmethod
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def unpad(data, bs=BLOCKSIZE):
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l = len(data)
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n = data[-1]
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if n > bs:
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raise ValueError(f"Cannot unpad, invalid padding length of {n} bytes")
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else:
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return data[:l-n] |