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https://github.com/elseif/MikroTikPatch.git
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80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
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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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from .PrivKeyOps import PrivKeyOpECDSASign, PrivKeyOpECIESDecrypt, PrivKeyOpEDDSASign, PrivKeyOpEDDSAKeyGen, PrivKeyOpEDDSAEncode, PrivKeyOpECDH, PrivKeyOpLoad
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from .ECPublicKey import ECPublicKey
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from .Random import secure_rand_int_between
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class ECPrivateKey(PrivKeyOpECDSASign, PrivKeyOpECIESDecrypt, PrivKeyOpEDDSASign, PrivKeyOpEDDSAKeyGen, PrivKeyOpEDDSAEncode, PrivKeyOpECDH, PrivKeyOpLoad):
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"""Represents an elliptic curve private key."""
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def __init__(self, scalar, curve):
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"""Initialize the private key with the given scalar on the given
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curve."""
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self._seed = None
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self._scalar = scalar
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self._curve = curve
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self._pubkey = ECPublicKey(self._scalar * self._curve.G)
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@property
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def scalar(self):
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"""Returns the private scalar d of the key."""
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return self._scalar
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@property
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def curve(self):
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"""Returns the group which is used for EC computations."""
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return self._curve
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@property
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def pubkey(self):
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"""Returns the public key that is the counterpart to this private key."""
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return self._pubkey
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@property
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def seed(self):
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"""Returns the seed or None if there wasn't one. A seed is used for
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schemes like EdDSA; it basically is a binary string that is hashed to
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yield that actual private scalar d."""
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return self._seed
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def set_seed(self, seed):
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"""Sets the seed of the private key. This operation can only performed
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if no scalar has previously been set for this key."""
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assert(self._seed is None)
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self._seed = seed
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return self
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@staticmethod
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def generate(curve):
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"""Generate a random private key on a given curve."""
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scalar = secure_rand_int_between(1, curve.n - 1)
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return ECPrivateKey(scalar, curve)
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def __str__(self):
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if self._seed is None:
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return "PrivateKey<d = 0x%x>" % (self.scalar)
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else:
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seedstr = "".join("%02x" % (c) for c in self._seed)
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return "PrivateKey<d = 0x%x, seed = %s>" % (self.scalar, seedstr)
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