#!/usr/bin/python3

from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives import serialization


def gen_key():
    private_key = ec.generate_private_key(
        ec.SECP256K1(), default_backend()
    )
    return private_key


if __name__ == '__main__':
    
    key = gen_key()
    hexkey = key.private_numbers().private_value.to_bytes(32, 'big').hex()

    print(hexkey)