mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-11-25 15:10:17 +00:00
58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
# MIT License
|
|
#
|
|
# Copyright (c) 2015 Brian Warner and other contributors
|
|
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in all
|
|
# copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
|
|
from . import eddsa
|
|
|
|
class BadSignatureError(Exception):
|
|
pass
|
|
|
|
SECRETKEYBYTES = 64
|
|
PUBLICKEYBYTES = 32
|
|
SIGNATUREKEYBYTES = 64
|
|
|
|
def publickey(seed32):
|
|
assert len(seed32) == 32
|
|
vk32 = eddsa.publickey(seed32)
|
|
return vk32, seed32+vk32
|
|
|
|
def sign(msg, skvk):
|
|
assert len(skvk) == 64
|
|
sk = skvk[:32]
|
|
vk = skvk[32:]
|
|
sig = eddsa.signature(msg, sk, vk)
|
|
return sig+msg
|
|
|
|
def open(sigmsg, vk):
|
|
assert len(vk) == 32
|
|
sig = sigmsg[:64]
|
|
msg = sigmsg[64:]
|
|
try:
|
|
valid = eddsa.checkvalid(sig, msg, vk)
|
|
except ValueError as e:
|
|
raise BadSignatureError(e)
|
|
except Exception as e:
|
|
if str(e) == "decoding point that is not on curve":
|
|
raise BadSignatureError(e)
|
|
raise
|
|
if not valid:
|
|
raise BadSignatureError()
|
|
return msg |