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https://github.com/LBRYFoundation/LBRY-Vault.git
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2a5f108d4a
* substitute python prng generator with hmac_drbg * add warning, change version * brick cards version 0 * separate python-drbg module, include tests and license * import to match PEP 8 * fix line break, minor changes in wording * fixes noise_seed formatting errors * fix import, include license exclude tests drbg module
51 lines
1.8 KiB
Python
51 lines
1.8 KiB
Python
'''
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Copyright (c) 2014 David Lazar <lazard@mit.edu>
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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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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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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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'''
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import hashlib
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import hmac
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class DRBG(object):
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def __init__(self, seed):
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self.key = b'\x00' * 64
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self.val = b'\x01' * 64
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self.reseed(seed)
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def hmac(self, key, val):
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return hmac.new(key, val, hashlib.sha512).digest()
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def reseed(self, data=b''):
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self.key = self.hmac(self.key, self.val + b'\x00' + data)
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self.val = self.hmac(self.key, self.val)
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if data:
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self.key = self.hmac(self.key, self.val + b'\x01' + data)
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self.val = self.hmac(self.key, self.val)
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def generate(self, n):
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xs = b''
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while len(xs) < n:
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self.val = self.hmac(self.key, self.val)
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xs += self.val
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self.reseed()
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return xs[:n]
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