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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 hashlib
import re
from typing import Type, TypeVar
import base58
from duniterpy.constants import PUBKEY_REGEX
from duniterpy.tools import ensure_str
# required to type hint cls in classmethod
CRCPubkeyType = TypeVar("CRCPubkeyType", bound="CRCPubkey")
class CRCPubkey:
"""
Class to implement a crc on a pubkey
"""
re_crc_pubkey = re.compile(f"({PUBKEY_REGEX}):([A-Za-z0-9]{{3}})")
def __init__(self, pubkey: str, crc: str) -> None:
"""
Creates a pubkey with a crc
:param pubkey: Public key
:param crc: CRC
"""
self.pubkey = pubkey
self.crc = crc
@classmethod
def from_str(cls: Type[CRCPubkeyType], crc_pubkey: str) -> CRCPubkeyType:
"""
Return CRCPubkey instance from CRC public key string
:param crc_pubkey: CRC public key
:return:
"""
data = CRCPubkey.re_crc_pubkey.match(crc_pubkey)
if data is None:
raise Exception(f"Could not parse CRC public key {crc_pubkey}")
pubkey = data.group(1)
crc = data.group(2)
return cls(pubkey, crc)
@classmethod
def from_pubkey(cls: Type[CRCPubkeyType], pubkey: str) -> CRCPubkeyType:
"""
Return CRCPubkey instance from public key string
:param pubkey: Public key
:return:
"""
hash_root = hashlib.sha256()
hash_root.update(base58.b58decode(pubkey))
hash_squared = hashlib.sha256()
hash_squared.update(hash_root.digest())
b58_checksum = ensure_str(base58.b58encode(hash_squared.digest()))
crc = b58_checksum[:3]
return cls(pubkey, crc)
def is_valid(self) -> bool:
"""
Return True if CRC is valid
:return:
"""
return CRCPubkey.from_pubkey(self.pubkey).crc == self.crc
def __str__(self) -> str:
"""
Return string representation of instance
:return:
"""
return f"{self.pubkey}:{self.crc}"
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