r.py

r.py

#!/usr/bin/python

#################################################################################
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#.______               _______.  ______     ___      .__   __.                  #
#|   _  \             /       | /      |   /   \     |  \ |  |                  #
#|  |_)  |    ______ |   (----`|  ,----'  /  ^  \    |   \|  |                  #
#|      /    |______| \   \    |  |      /  /_\  \   |  . `  |                  #
#|  |\  \----.    .----)   |   |  `----./  _____  \  |  |\   |                  #
#| _| `._____|    |_______/     \______/__/     \__\ |__| \__|  v0.2.0          #
#                                                                               #
#GNU PL - 2015 - ca333  (modified by simcity4242)							    #
#                                                                               #
#USE AT OWN RISK!                                                               #
#################################################################################

import json
import urllib2
import time
import sys

#for some reason blockchain.info api-chain is 59711 blocks short..
#blockstart = 170399
#blockstart += 59711
#blockcount = urllib2.urlopen("https://blockchain.info/en/q/getblockcount").read()

def rscan(addr):
	"""Check address for duplicated r values."""
	# TODO: add BCI API check address

	print "WELCOME TO R-scan v0.1.2!"
	print "ADDRESS-R-SCAN: "
	
	urladdr = 'https://blockchain.info/address/%s?format=json&offset=%s'

	###control api-url
	#print str(urladdr[:-22] % addr)

	addrdata = json.load(urllib2.urlopen(urladdr % (addr, '0')))
	ntx = addrdata['n_tx']
	print "Data for pubkey: " + str(addr) + " has " + str(addrdata['n_tx']).center(6) + "Tx%s" % 's'[ntx==1:]
	#print "number of txs: " + str(addrdata['n_tx'])

	#tx-details:

	txs = []
	for i in range(0, ntx//50 + 1):
		sys.stderr.write("Fetching Txs from offset\t%s\n" % str(i*50))
		jdata = json.load(urllib2.urlopen(urladdr % (addr, str(i*50))))
		txs.extend(jdata['txs'])	

	assert len(txs) == ntx
	addrdata['txs'] = txs


	y = 0
	inputs = []
	while y < ntx:	
		#print "#################################################################################"
		#print "TX nr :" + str(y+1)
		#print "hash: " + str(addrdata['txs'][y]['hash'])
		#print "number of inputs: " + str(addrdata['txs'][y]['vin_sz'])
		#only if
		#if addrdata['txs'][y]['vin_sz'] > 1:
		zy = 0
		while zy < addrdata['txs'][y]['vin_sz']:
			#print "Input-ScriptNR " + str(zy+1) + " :" + str(addrdata['txs'][y]['inputs'][zy]['script'])
			inputs.append(addrdata['txs'][y]['inputs'][zy]['script'])
			zy += 1
		y += 1

	xi = 0
	zi = 1
	lenx = len(inputs)
	alert = 0
	
	bad = []
	#compare the sig values in each input script
	while xi < lenx-1:
		x = 0
		while x < lenx-zi:
			if inputs[xi][10:74] == inputs[x+zi][10:74]:
				#print "In Input NR: " + str(xi) + "[global increment] " + str(inputs[xi])
				#print('\a')
				print "Resued R-Value: "
				print inputs[x+zi][10:74]
				bad.append((int(x), str(inputs[x+zi][10:74])))
				alert += 1
			x += 1
			zi += 1
		xi += 1

	#check duplicates
	#alert when everything ok

	if alert < 1:
		print "Good pubKey. No problems."
	else:
		print "Address %s has %d reused R value%s!" % (addr, len(bad), "s"[len(bad)==1:])
		return bad
		
if __name__ == '__main__':
	from sys import argv
	print """python rscan.py 1BFhrfTTZP3Nw4BNy4eX4KFLsn9ZeijcMm"""
	if len(argv) == 1:
		addr = raw_input("Enter Bitcoin address eg 1BFhrfTTZP3Nw4BNy4eX4KFLsn9ZeijcMm")
	elif len(argv) == 2 and isinstance(argv[1], basestring):
		addr = str(argv[1])
	rscan(addr)
	
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