50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
"""High level Verifiable Delay Function using keccak (sha3)."""
|
|
from hashlib import sha3_256
|
|
from typing import Union
|
|
import timeit
|
|
|
|
from .mimc import forward_mimc, reverse_mimc
|
|
"""
|
|
Kevin Froman 2020
|
|
|
|
This program 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.
|
|
|
|
This program 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 <https://www.gnu.org/licenses/>.
|
|
"""
|
|
DEFAULT_ROUNDS = 8000
|
|
|
|
|
|
def _sha3_256_hash(data: bytes) -> str:
|
|
sha3 = sha3_256()
|
|
sha3.update(data)
|
|
return sha3.hexdigest()
|
|
|
|
|
|
def vdf_create(data: bytes, rounds: int = DEFAULT_ROUNDS) -> str:
|
|
assert rounds > 0
|
|
input_hash = int(_sha3_256_hash(data), 16)
|
|
return hex(forward_mimc(input_hash, rounds)).replace('0x', '')
|
|
|
|
|
|
def vdf_verify(
|
|
data: bytes,
|
|
test_hash: Union[str, bytes],
|
|
rounds: int = DEFAULT_ROUNDS) -> bool:
|
|
"""Verify data for test_hash generated by vdf_create."""
|
|
assert rounds > 0
|
|
return _sha3_256_hash(data) == \
|
|
hex(reverse_mimc(int(test_hash, 16), rounds)).replace('0x', '')
|
|
|
|
|
|
def profile_cpu_speed(rounds=1000) -> float:
|
|
return timeit.timeit(lambda: vdf_create(b"test", rounds), number=100)
|