#!/usr/bin/env python3
import sys, argparse, bcrypt

def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--hash", required=True)
    ap.add_argument("--password-stdin", action="store_true")
    args = ap.parse_args()

    if not args.password_stdin:
        print("ERR")
        return 2

    password = sys.stdin.read().rstrip("\r\n")
    try:
        ok = bcrypt.checkpw(password.encode("utf-8"),
                            args.hash.encode("ascii"))
    except Exception:
        print("ERR")
        return 2

    print("OK" if ok else "ERR")
    return 0 if ok else 1

if __name__ == "__main__":
    sys.exit(main())