generating_private_key.py

import secrets
import time
import random

# I refered this site
# https://www.freecodecamp.org/news/how-to-generate-your-very-own-bitcoin-private-key-7ad0f4936e6c/

def simple_method():
    #Module which can produce cryptographically strong RNG
    #Dont use any module like random because it is based on seed and by default the seed is the current time.
    import secrets

    bits = secrets.randbits(256)
    print("Binary :",bits)

    bits_hex = hex(bits)
    print("HexaDecmal :",bits_hex)

    private_key = bits_hex[2:]
    print("Private Key :",private_key)

    #Specialized site
    #https://www.bitaddress.org


# I referred this github account
# https://github.com/Destiner/blocksmith/blob/master/blocksmith/generator.py
# The Key_Generator class is the real implementation of this site "https://www.bitaddress.org"

class Key_Generator:
    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

if __name__=='__main__':
    kg = Key_Generator()
    kg.seed_input("Trutly random string. I rolled a dice and got 4")
    print(kg.generate_key())