Hi,
is there an open-source wallet brute force cracker, which takes the input from a wordlist file and reports the successful passphrase?
It is not uncommon for people to lose part of their passphrase and they need to test a few 10000 variations.
A feasible solution right now is to use the RPC interface and wrap it in a script, this way I achieve about 10 trial keys per second. So if the wordlist is < 100,000 keys, a full scan should be completed in about 3-4 hours. (since the procedure is embarrassingly parallel you can easily increase the cracking speed, e.g. 1000 instances should give you about 25 million trial keys / hour)
procedure:
0) create a wordlist with one of the major password cracking tools (e.g. john the ripper)
1) run bitcoind as a server with RPC active
2) adjust the following python script to your operating system and environment (link:
http://ubuntuone.com/7XJaHf4OH4Ak91DUGhscvG):
import subprocess
import sys
wordfile=open(sys.argv[1],"r")
logfile=open(sys.argv[2],"a")
for l in wordfile:
sys.stdout.write("trying %s" % l)
w=l.strip()
p=subprocess.Popen(['./bitcoind','walletpassphrase',w,"1"],stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
s=p.communicate()[0]
if ("incorrect" in s):
logfile.write("%s: incorrect\n" % (w))
elif ("unlocked" in s):
logfile.write("%s: unlocked\n" % (w))
else:
logfile.write("%s: likely passphrase\n" % (w))
print "success!"
print "likely passphrase: %s" % (w)
break
logfile.close()
3) run the script local to your bitcoin directory:
python crack.py wordlist.txt log.txt
I'd appreciate if people could extend this thread by explicit instructions for their specific operating system and environment.
