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# Copyright 2014-2022 Vincent Texier <vit@free.fr>
#
# DuniterPy is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# DuniterPy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import base64
import libnacl.encode
import libnacl.sign
from .base58 import Base58Encoder
class VerifyingKey(libnacl.sign.Verifier):
"""
Class to verify documents
"""
def __init__(self, pubkey: str) -> None:
"""
Creates a Verify class from base58 pubkey
:param pubkey:
"""
key = libnacl.encode.hex_encode(Base58Encoder.decode(pubkey))
super().__init__(key)
def get_verified_data(self, data: bytes) -> bytes:
"""
Check specified signed data signature and return data without signature
Raise exception if signature is not valid
:param data: Data + signature
:return:
"""
return self.verify(data)
def check_signature(self, data: str, signature: str) -> bool:
"""
Check if data signature is valid and from self.pubkey
:param data: Data to check
:param signature: Signature to check
:return:
"""
prepended = base64.b64decode(signature) + bytes(data, "ascii")
try:
self.verify(prepended)
except ValueError:
return False
return True
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