#!/shebang

import json
import random
from base64 import b64decode, b64encode
from hashlib import sha512

from getch import getch, getche


def printf(*args, **kwargs):
    print(*args, **kwargs, end='', flush=True)

def sign(msg, iv):
    if type(msg) == str:
        msg = msg.encode()
    elif type(msg) != bytearray or type(msg) != bytes:
        raise ValueError("Byte! m8!")
    return b64encode(sha512(msg).digest() + sha512(iv).digest()).decode()

def main():
    printf("Press any key to generate one.")
    getch()
    print()
    ivb = getche().encode()
    iv = ivb + random.randbytes(31)
    msg = 'Pv!'
    test = sign(msg, iv)
    print(msg)
    print(test)
    print(json.dumps({'iv': sha512(iv).hexdigest(), 'msg' : msg, 'msg_hash': test}))

if __name__ == '__main__':
    main()