system("sudo bitcoind", "bruteforce", "basepassword" + phrase, "20")
WTF!! seriously how far up your butt are your head?
have you even tried cracking a password before, on your own?
SUDO Really?
the method you are using have way too much overhead to be anywhere possible even to crack a 4-char password.
1. you are comminucating with bitcoind over jsonrpc over http over tcp.
2. bitcoind are using berkeley DB, to check if the password s correct.
RLY? U CRAZY?
solution:
extract enough information from from wallet.dat, to be able to verify a password, look in berkeleyDB manuels, bitcoin source, and determent what is needed.
implement algoritm in some sort of GPU code(cuda, opencl,...) that do this efficient.
It would not work