Verifying results on Dice64.com

verify_bey.py

import hashlib
import requests

# Doesn't currently do signature checking, we'll implement that in soon.
URL = "https://dice64.com"


def dsha256(input):
    return hashlib.sha256(hashlib.sha256(input.decode('hex')).digest()).hexdigest()


def verify_bet(id):
    r = requests.get(URL + '/api/bets/'+str(id))

    if r.status_code != 200:
        print "Couldn't find bet"
        exit()

    secret = r.json()['secret']
    secret_hash = r.json()['secret_hash']
    nonce = r.json()['nonce']
    combined_hash = r.json()['combined_hash']
    result = r.json()['result']
    # Calculated results
    combined = int(secret, base=16) + nonce
    combined_hex = hex(combined)[2:].strip("L")

    # Add preceeding zeros to make it 64 bytes in length
    while len(combined_hex) < 64:
        combined_hex = "0"+combined_hex

    # Print output
    print "\nSecret Hash - dsha256(secret)"
    print "Calculated:", dsha256(secret)
    print "Server val:", secret_hash

    print "\nCombined Hash - dsha256(secret + nonce)"
    print "Calculated:", dsha256(combined_hex)
    print "Server val:", combined_hash

    print "\nResult - dsha256(secret + nonce) mod 64"
    print "Calculated:", long(combined_hash, base=16) % 64
    print "Server val:", result


if __name__ == "__main__":
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument('id', help='id of bet to check', type=int)
    args = parser.parse_args()

    verify_bet(args.id)