mirror of
https://github.com/elseif/MikroTikPatch.git
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78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
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#
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# toyecc - A small Elliptic Curve Cryptography Demonstration.
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# Copyright (C) 2011-2022 Johannes Bauer
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#
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# This file is part of toyecc.
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#
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# toyecc is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; this program is ONLY licensed under
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# version 3 of the License, later versions are explicitly excluded.
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#
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# toyecc is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with toyecc; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Johannes Bauer <JohannesBauer@gmx.de>
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#
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import hashlib
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class CurveQuirk(object):
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identifier = None
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@property
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def identity(self):
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return (self.identifier, )
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def __eq__(self, other):
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return self.identity == other.identity
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def __ne__(self, other):
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return not (self == other)
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def __lt__(self, other):
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return self.identity < other.identity
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def __hash__(self):
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return hash(self.identity)
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def __str__(self):
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return self.identifier
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class CurveQuirkEdDSASetPrivateKeyMSB(CurveQuirk):
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"""Set the highest significant bit of the private key during EdDSA
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signature generation. For example, for EdDSA signatures on Ed25519, this
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would bitwise or the value 'a' with 2^254."""
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identifier = "EdDSA_set_private_key_MSB"
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class CurveQuirkEdDSAEnsurePrimeOrderSubgroup(CurveQuirk):
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"""Ensures during EdDSA signature generation that the private key is on a
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prime-order subgroup. This is done by clearing the amount of bits that is
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required by the cofactor of the curve (which has to be a power of two for
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this quirk to work, otherwise it'll fail at runtime). Concretely, for EdDSA
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on Ed25519 this means that the least significant three bits would be set to
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zero because the curve cofactor is 8."""
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identifier = "EdDSA_use_prime_order_subgroup"
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class CurveQuirkSigningHashFunction(CurveQuirk):
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"""For some curves, the signing hash function is implicitly given. In
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particular for the Ed448 and Ed25519 variants, this is true. Encode these
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as a curve quirk."""
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identifier = "signing_hash_function"
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def __init__(self, sig_fnc_name):
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self._sig_fnc_name = sig_fnc_name
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def hashdata(self, data):
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hash_fnc = {
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"sha512": lambda x: hashlib.sha512(data).digest(),
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"shake256-114": lambda x: hashlib.shake_256(data).digest(114),
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}
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return hash_fnc[self._sig_fnc_name](data)
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