forked from STI/Astroport.ONE
95 lines
2.7 KiB
Python
95 lines
2.7 KiB
Python
# Copyright 2014-2024 Vincent Texier <vit@free.fr>
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#
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# DuniterPy 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, either version 3 of the License, or
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# (at your option) any later version.
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#
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# DuniterPy 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 this program. If not, see <http://www.gnu.org/licenses/>.
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import hashlib
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import re
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from typing import Type, TypeVar
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import base58
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from duniterpy.constants import PUBKEY_REGEX
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from duniterpy.tools import ensure_str
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# required to type hint cls in classmethod
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CRCPubkeyType = TypeVar("CRCPubkeyType", bound="CRCPubkey")
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class CRCPubkeyException(Exception):
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pass
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class CRCPubkey:
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"""
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Class to implement a crc on a pubkey
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"""
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re_crc_pubkey = re.compile(f"({PUBKEY_REGEX}):([A-Za-z0-9]{{3}})")
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def __init__(self, pubkey: str, crc: str) -> None:
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"""
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Creates a pubkey with a crc
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:param pubkey: Public key
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:param crc: CRC
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"""
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self.pubkey = pubkey
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self.crc = crc
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@classmethod
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def from_str(cls: Type[CRCPubkeyType], crc_pubkey: str) -> CRCPubkeyType:
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"""
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Return CRCPubkey instance from CRC public key string
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:param crc_pubkey: CRC public key
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:return:
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"""
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data = CRCPubkey.re_crc_pubkey.match(crc_pubkey)
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if data is None:
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raise CRCPubkeyException(f"Could not parse CRC public key {crc_pubkey}")
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pubkey = data.group(1)
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crc = data.group(2)
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return cls(pubkey, crc)
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@classmethod
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def from_pubkey(cls: Type[CRCPubkeyType], pubkey: str) -> CRCPubkeyType:
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"""
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Return CRCPubkey instance from public key string
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:param pubkey: Public key
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:return:
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"""
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hash_root = hashlib.sha256()
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hash_root.update(base58.b58decode(pubkey))
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hash_squared = hashlib.sha256()
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hash_squared.update(hash_root.digest())
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b58_checksum = ensure_str(base58.b58encode(hash_squared.digest()))
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crc = b58_checksum[:3]
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return cls(pubkey, crc)
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def is_valid(self) -> bool:
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"""
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Return True if CRC is valid
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:return:
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"""
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return CRCPubkey.from_pubkey(self.pubkey).crc == self.crc
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def __str__(self) -> str:
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"""
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Return string representation of instance
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:return:
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"""
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return f"{self.pubkey}:{self.crc}"
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