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keygen.py
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keygen.py
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import time
import random
import secrets
class KeyGenerator:
def __init__(self):
self.POOL_SIZE = 256
self.KEY_BYTES = 32
self.CURVE_ORDER = int('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141', 16)
self.pool = [0] * self.POOL_SIZE
self.pool_pointer = 0
self.prng_state = None
self.__init_pool()
def seed_input(self, str_input):
time_int = int()#time.time()
self.__seed_int(time_int)
for char in str_input:
char_code = ord(char)
self.__seed_byte(char_code)
def generate_key(self):
big_int = self.__generate_big_int()
big_int = big_int % (self.CURVE_ORDER - 1) # key < curve order
big_int = big_int + 1 # key > 0
key = hex(big_int)[2:]
# Add leading zeros if the hex key is smaller than 64 chars
key = key.zfill(self.KEY_BYTES * 2)
return key
def __init_pool(self):
for i in range(self.POOL_SIZE):
random_byte = secrets.randbits(8)
self.__seed_byte(random_byte)
time_int = int()#time.time()
self.__seed_int(time_int)
def __seed_int(self, n):
self.__seed_byte(n)
self.__seed_byte(n >> 8)
self.__seed_byte(n >> 16)
self.__seed_byte(n >> 24)
def __seed_byte(self, n):
self.pool[self.pool_pointer] ^= n & 255
self.pool_pointer += 1
if self.pool_pointer >= self.POOL_SIZE:
self.pool_pointer = 0
def __generate_big_int(self):
if self.prng_state is None:
seed = int.from_bytes(self.pool, byteorder='big', signed=False)
random.seed(seed)
self.prng_state = random.getstate()
random.setstate(self.prng_state)
big_int = random.getrandbits(self.KEY_BYTES * 8)
self.prng_state = random.getstate()
return big_int