# https://github.com/vergl4s/ethereum-mnemonic-utils/blob/master/mnemonic_utils.py
import math
import os
from hashlib import pbkdf2_hmac
from ._settings import PBKDF_ITERATIONS
from nacl.bindings import crypto_sign_ed25519_sk_to_pk
from nacl.signing import VerifyKey, exc
def get_secure_random_number(min_v, max_v):
range_betw = max_v - min_v
bits_needed = math.ceil(math.log2(range_betw))
if bits_needed > 53:
raise Exception("Range is too large")
bytes_needed = math.ceil(bits_needed / 8)
mask = math.pow(2, bits_needed) - 1
while True:
res = os.urandom(bits_needed)
power = (bytes_needed - 1) * 8
number_val = 0
for i in range(bytes_needed):
number_val += res[i] * math.pow(2, power)
power -= 8
number_val = int(number_val) & int(mask)
if number_val >= range_betw:
continue
return min_v + number_val
def is_basic_seed(entropy):
seed = pbkdf2_hmac("sha512", entropy, 'TON seed version'.encode(
'utf-8'), max(1, math.floor(PBKDF_ITERATIONS / 256)))
return seed[0] == 0
def private_key_to_public_key(priv_k: bytes):
return crypto_sign_ed25519_sk_to_pk(priv_k)
def verify_sign(public_key: bytes, signed_message: bytes, signature: bytes):
key = VerifyKey(public_key)
try:
key.verify(signed_message, signature)
return True
except exc.BadSignatureError:
return False
