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__author__=''' Suraj Singh bisht surajsinghbisht054@gmail.com www.bitforestinfo.com github.com/surajsinghbisht054
'''
# coding: utf-8
# In[100]:
import json import os from hashlib import sha256 from Crypto.PublicKey import RSA from Crypto.Signature import PKCS1_PSS from hashlib import md5 from hashlib import sha256 from Crypto.Hash import SHA256 import binascii import base64 import time
# In[101]:
# # User Authentication Handling Class # class User: def __init__(self, private=None, public=None): ''' A Simple Class To Handle User Authentication Activities ''' if public: self.publickey = public else: self.publickey = '' if private: self.privatekey = RSA.importKey(private) else: (self.privatekey, self.address) = self.generate_key_pair() def generate_key_pair(self): ''' Generate New Pair Of Keys For New Users ''' private = None public = None
# Random Number Generated random = RSA.Random.new().read PUB_LEN = 1024
# RSA Object RSAKey = RSA.generate(PUB_LEN, random)
# Private Key private = RSAKey.exportKey()
# Public Key self.publickey = RSAKey.publickey().exportKey() public = sha256(self.publickey).hexdigest() public = sha256(public).hexdigest() public = md5(public).hexdigest() return (private, public) def signature(self, data): ''' Sign Data Using User Inserted/Generated Private Key ''' r = RSA.importKey(self.privatekey) siger = PKCS1_PSS.new(r) h = SHA256.new(data) sign = base64.b64encode(siger.sign(h)) return sign
#u = User() #print u.publickey #print u.privatekey #print u.address #print u.signature(u.address)
# In[102]:
# Global Functions
def previous_block_hash(blockitemdict): ''' Global Function To Calculate previous block hashes ''' return sha256("{index}{previoushash}{timestamp}{hash}{datahash}{nonce}{targetbit}".format(**blockitemdict)).hexdigest()
def transection_hash(data): ''' Global Function To Calculate Transection hashes ''' return sha256("{category}{txni}{coin}{fee}{signature}{time}".format(**data.getitems())).hexdigest()
def merkle_hash(dataload): ''' A Simple Class That Automatically Calculate Hashes Of All Transection feilds using Merkle Type Algorithm. ''' # Two Empty Containers hl1 = [] hl2 = [] for data in dataload: hl1.append(transection_hash(data)) if not hl1: return sha256('').hexdigest() while True: v1 = '' v2 = '' hl2 = [] if int(len(hl1) % 2)==0 and len(hl1)>1: # Even Number's List for h in hl1: if not v1: v1 = h continue v2 = h hl2.append(sha256(v1+v2).hexdigest()) v1 = '' v2 = '' elif int(len(hl1) % 2)==1 and len(hl1)>1: hl2 = hl1 hl2.append('') elif len(hl1)==1: return hl1[0] else: return False
hl1 = hl2
return False
# ( # category, --> mine, send, receive # sender --> Sender Wallet Address # receiver --> Receiver Wallet Address # txni, --> input transection # ccoin --> net balance # coin, --> coin # fee, --> transection fee # time, --> time # signature, --> hash = sha256(category + sender + receiver + txni + txno + coin + fee + time) # hash = private_key_signature(hash) # # # verification --> SENDER_PUBLIC_KEY # ) def verify_transection(bco, transobj): # Load Values From Transection Object category = transobj.category sender = transobj.sender receiver = transobj.receiver txni = transobj.txni ccoin = transobj.ccoin coin = transobj.coin fee = transobj.fee timestamp = transobj.time signature = transobj.signature verification = transobj.verification # Check sender address length if len(receiver)!=32: print "[+] Condition No. 1 Failed By ", receiver return False # Check Current Transection Time With Previous block time if not (float(timestamp) < float(time.time())): print "[+] Condition No. 2 Failed By ", receiver print "[-] Timestamp {}, Current Time {}".format(timestamp, time.time()) return False # Miners Transection Conditions if (category=='mine') and (sender!=''): print "[+] Condition No. 3 Failed By ", receiver return False if (category=='mine') and txni: print "[+] Condition No. 4 Failed By ", receiver return False if (category=='mine') and ccoin: print "[+] Condition No. 5 Failed By ", receiver return False if (category=='mine') and (int(coin) != 25 ): print "[+] Condition No. 6 Failed By ", receiver return False if (category=='mine') and fee: print "[+] Condition No. 7 Failed By ", receiver return False if (category=='mine') and not signature: print "[+] Condition No. 8 Failed By ", receiver return False if (category=='mine') and verification: print "[+] Condition No. 9 Failed By ", receiver return False # Miners Conditions Close if category=="mine": return True # Senders Conditions Verification if (category=='send') and (len(sender)!=32): print "[+] Condition No. 10 Failed By ", sender return False if (category=='send') and not txni: print "[+] Condition No. 11 Failed By ", sender return False if (category=='send') and not coin: print "[+] Condition No. 12 Failed By ", sender return False if (category=='send') and not fee: print "[+] Condition No. 13 Failed By ", sender return False if (category=='send') and not signature: print "[+] Condition No. 14 Failed By ", sender return False if (category=='send') and not verification: print "[+] Condition No. 15 Failed By ", sender return False # Verify verification and sender address public = sha256(verification).hexdigest() public = sha256(public).hexdigest() public = md5(public).hexdigest() if not (public==sender): print "[x] Invalid Sender Address : {} | {}".format(sender, public) return False # Verify Signature h = category + sender + receiver + txni + coin + fee + timestamp h = sha256(h).hexdigest() h = SHA256.new(h) r = RSA.importKey(verification) sign_verify = PKCS1_PSS.new(r) dsignature = base64.b64decode(signature) if not sign_verify.verify(h, dsignature): print "[x] Signature Invalid. Transection Index {} | Sender {} ".format(txni, sender) return False print "[+] Transection Signature Verified." # # So, Previous Conditions Verified That Request Is Generated From Real User # # Now, Let's Do Some mathematical Calculations for Amount. # input_transections = [] balance = 0.0 n = len(txni)/64 for i in range(n): input_transections.append(txni[i*64: (i+1)*64]) for pretxnid in input_transections: if bco.double_spend_check(sender, pretxnid): print "[x] Double Spend Detected. Transection Index {}, InputTransection {}".format(txni, pretxnid) return False # Find Transections Into Blockchain data = bco.search_transection_dict(pretxnid)
if not data: print "[x] Invalid Transection Input." return False #{ # 'category' # 'sender' # 'receiver' # 'fee': '', # 'ccoin': '', # 'txni': '', # 'time': '1526936989.86', # 'signature': '40eee107b43f2254ef8ea5c9d15f63bba6e872bb2421b3da09173fb88cdd1c8c6578bfe7780cc1d5223c289c95dbbb9bfcc303cd9379e4f47ea7ca095b1e1e4125ed6fbb3c072901dc7c45e34faeeccec1b07bbe972ed94f354a1153ed9ecca402098e64eaf07621d8b35deaa8bcd003edc8f3d8770a93627f8e073d4b1c6ff6', # 'coin': '25' #} # Verify Input Transection Signatures load = data['load'] if load['receiver']==sender: # # Taking Balance Inputs From Receiving Transections # # Verify Signature tmp = load['category'] + load['sender'] + load['receiver'] + load['txni'] + load['coin'] + load['fee'] + load['time'] tmp = sha256(tmp).hexdigest() tmp = SHA256.new(tmp) dsignature = base64.b64decode(load['signature']) if sign_verify.verify(tmp, dsignature): print "[+] Input Transection {} \n\t\tVerified By {}".format(pretxnid, sender) else: print "[-] Input Transection {} \n\t\tVerification Failed By {}".format(pretxnid, sender) return False balance+= float(load['coin']) elif load['sender']==sender: # # Taking Inputs From Transection Balance Changes # balance+= float(load['ccoin']) else: print "[-] Something Wrong With Conditions." print load pass if balance==0.0: print "[x] Insuffecient Balance" return False if balance < float(float(coin)+float(fee)+float(ccoin)): print "[x] Low Balance" return False return balance
# In[103]:
# # trasenction feild structure # ( # category, --> mine, send, receive # sender --> Sender Wallet Address # receiver --> Receiver Wallet Address # txni, --> input transection # txno, --> output transection # ccoin --> net balance # coin, --> coin # fee, --> transection fee # time, --> time # signature, --> hash = sha256(category + sender + receiver + txni + txno + coin + fee + time) # hash = private_key_signature(hash) # # # verification --> SENDER_PUBLIC_KEY # ) # # Trasenction Unique Identities # # structure # ( # # Name : SHA256( sender + receiver ) ---> Result Hash Will Be Same # if Sender and Reciever are same (Not Unique) # txnid : SHA256( Name + Signature) --> Always Unique # # txn : trasenction feild # # ) # # # #
# Simple Request Transection () class RequestTransection: def __init__(self, user): ''' A Simple Class To Handle And Generate Valid Transection Requests Using User Object Authentication Object. ''' self.category = '' self.user = user self.sender = None self.receiver = None self.txni = [] self.ccoin = '' self.coin = '' self.time = '' self.fee = '' self.signature = '' self.transection = {} self.verification = '' def getitems(self): ''' Get All Feild Items ''' time.sleep(1) return { "category" : self.category, 'sender': self.sender, 'receiver' :self.receiver, "txni" : self.txni, "ccoin" : self.ccoin, "coin" : self.coin, "fee" : self.fee, "signature" : self.signature, "time" : self.time, } def __repr__(self): return "< transReq {} | {} >".format(self.category, self.time)
def create_transection(self, category='mine', txni=[], coin='', fee='', receiver = '', sender = '', ccoin=''): ''' Generate Valid Transection Request With Automatic Hash And Signature handling ''' if not sender: sender = self.user.address if category=="mine": sender ='' receiver = self.user.address if not receiver: raise "please insert valid receiver address." # Lower case --- > category category = category.lower() # Check category if category not in ['mine', 'send']: raise "please use valid categories like mine or send " # initialise values self.category = category self.sender = sender self.receiver = receiver self.txni = ''.join(i for i in txni) self.coin = coin self.ccoin = ccoin self.fee = fee self.time = str(time.time()) # # signature, --> hash = sha256(category + sender + receiver + txni + coin + fee + time) # private_key_signature(hash) # h = self.category + self.sender + self.receiver + self.txni + self.coin + self.fee + self.time h = sha256(h).hexdigest() if self.category!="mine": self.verification = self.user.publickey self.signature = self.user.signature(h) self.transection = { "name" : sha256(self.sender + self.receiver).hexdigest(), "txn" : sha256( sha256(self.sender + self.receiver).hexdigest() + self.signature).hexdigest(), "load" : self.getitems(), } return
# In[104]:
# # # RequestBlock Object handler # # Structure # ( # index ---> current block index in chain # previoushash ---> previous block hash # timestamp ---> timestamp # targetbit ---> difficulty bit in hash calculation # hash ---> self block hash (proof of work) # datahash ---> datahash (merkle hash of transection feilds) # dataload ---> all transection data # nonce ---> nonce (proof of work) # ) # # # # # class RequestBlock: def __init__(self, bco, targetbit=4, transbuffer = []): ''' A Simple Class To Handle All Transection Request And Generate A Valid Block. ''' self.bco = bco # SimpleBlockChain Class Object self.index = self.bco.check_chain_len()+1 if self.bco.pre_block(): self.previoushash = previous_block_hash(self.bco.pre_block()) else: self.previoushash = '' self.timestamp = str(time.time()) self.targetbit = targetbit self.hash = '' self.datahash = '' self.dataload = [] self.nonce = '' self.transbuffer = transbuffer self.calculate_block()
def calculate_block(self): ''' Calculate Block Hash ''' # load transections from Node Buffer self.load_data_from_network_buffer() tmp = merkle_hash(self.dataload) if not tmp: print "[Note] No Data load Found" self.datahash = tmp return def load_data_from_network_buffer(self): ''' Load Trasection Requests ''' senders = [] for trans_req in self.transbuffer: if trans_req not in self.dataload: if verify_transection(self.bco, trans_req): if trans_req.sender not in senders: self.dataload.append(trans_req) senders.append(trans_req.sender) else: print "[x] Double Transection Request Found. ", trans_req else: print "[x] Transection Verification Fail.", trans_req return def getitems(self): ''' return items ''' return { "index" : self.index, "previoushash": self.previoushash, "timestamp" : self.timestamp, "targetbit" : self.targetbit, "hash" : self.hash, "datahash" : self.datahash, "dataload" : [i.transection for i in self.dataload], "nonce" : self.nonce, }
# In[105]:
# # Class Design To Perform Proof Of Work Hash Calculations # class MineBlock: ''' A Simple Class That will Automatically handle Block Mining And Other Important Stuff. ''' def __init__(self, block_chain_obj): self.bco = block_chain_obj self.pow = False self.block = '' self.difficulty = 0 def block_validator(self, block): # Check Index # Check PRevious hash # check timestamp # check merkle hash if self.bco.check_chain_len()==0: previoushash = True else: previoushash = block.previoushash == previous_block_hash(self.bco.pre_block())#sha256("{index}{previoushash}{timestamp}{hash}{datahash}{nonce}{targetbit}".format(**self.pre_block())).hexdigest() timestamp = float(block.timestamp) < time.time() index = block.index == self.bco.check_chain_len()+1 datahash = merkle_hash(block.dataload) if previoushash and timestamp and index and datahash: return True print "[+] Block Condition Failur During MineBLock Verification." print "[-] Previous hash verify : ", previoushash #print "[-] Proof Of Work verify : ", proof_of_work_hash print "[-] Timestamp verify : ", timestamp print "[-] Block Index verify : ", index print "[-] Block Datahash verify : ", datahash return False def load(self, block): ''' Load Block ''' time.sleep(2) # To pass timestamp condition if self.block_validator(block): self.block = block self.difficulty = int(self.block.targetbit) self.proof_of_work_number_generator() self.pow = True return True return False def getblock(self): return self.block def getitems(self): return self.block.getitems() def proof_of_work_number_generator(self): self.block.nonce = 0 while sha256("{}{}{}{}{}".format(self.block.previoushash,self.block.datahash,self.block.timestamp,self.block.targetbit,self.block.nonce)).hexdigest()[:self.difficulty]!='0'*self.difficulty: self.block.nonce+= 1 self.block.hash = sha256("{}{}{}{}{}".format(self.block.previoushash,self.block.datahash,self.block.timestamp,self.block.targetbit,self.block.nonce)).hexdigest() return self.block.nonce
# In[106]:
# # Class To handle Block chain database and act as a central sever to handle all block request # class SimpleBlockChain: ''' A Simple Class To Handle Block Chain Database. ''' def __init__(self, dbname='ChainStore.json', targetbit = 4): self.targetbit = targetbit self.dbname = dbname # Check BlockChain Json Storage File if os.path.exists(self.dbname): self.chain = json.load(open(self.dbname, 'r')) else: self.chain = { "blockchain": [], 'lastupdate': time.time(), } # Check BlockChain Status if not self.check_chain_len(): # Add Genesis Block self.add_genesis_block() def getchain(self): return self.chain def search_transection_dict(self, txnid): for b in self.chain['blockchain'][::-1]: for l in b['dataload']: if l['txn']==txnid: return l return False def get_all_transections(self, address): rectxn = [] sentxn = [] for b in self.chain['blockchain'][::-1]: for l in b['dataload']: txn = l['txn'] n = l['load'] if n['sender']==address: sentxn.append(l) if n['receiver']==address: rectxn.append(l) return (rectxn, sentxn) # add genesis block request def add_genesis_block(self): ''' Add Genesis Block ''' print "[+] Add Genesis Block Request." tmpobj = RequestBlock(self) mineblock = MineBlock(self) mineblock.load(tmpobj) self.new_block_request(mineblock.getblock()) return # New Blocking Join Request def new_block_request(self, block): ''' New Block Request ''' # Verify Block if self.validate_new_block(block): self.chain['blockchain'].append(block.getitems()) print "[+] Request Block Verified. Index : ", block.index else: print "[Error] Request Block Is Not Valid." return # Validate New Block Before Joining It to main Chain def validate_new_block(self, block): ''' Validate And Verify Various Hash Calculations ''' # check target bit # check block index # check previous block hash # check timestamp # check datahash diff = self.targetbit == int(block.targetbit) if self.check_chain_len()==0: previoushash = True else: previoushash = block.previoushash == previous_block_hash(self.pre_block())#sha256("{index}{previoushash}{timestamp}{hash}{datahash}{nonce}{targetbit}".format(**self.pre_block())).hexdigest() proof_of_work_hash = sha256("{previoushash}{datahash}{timestamp}{targetbit}{nonce}".format(**block.getitems())).hexdigest()[:block.targetbit]=='0'*block.targetbit timestamp = float(block.timestamp) < time.time() index = block.index == self.check_chain_len()+1 datahash = merkle_hash(block.dataload) if previoushash and proof_of_work_hash and timestamp and index and datahash and diff: return True print "[+] Block Condition Failur During SimpleBLockChain Verification Member Function." print "[-] Previous hash verify : ", previoushash print "[-] Proof Of Work verify : ", proof_of_work_hash print "[-] Timestamp verify : ", timestamp print "[-] Block Index verify : ", index print "[-] Block Datahash verify : ", datahash print "[-] Block Targetbit verify: ", diff return False # Check block chain length def check_chain_len(self): return len(self.chain['blockchain']) def pre_block(self): if self.chain['blockchain']: return self.chain['blockchain'][-1] #return # save updates def close(self): f = open(self.dbname, 'w') self.chain['lastupdate']= time.time() json.dump(self.chain, f, sort_keys=True, indent=4, separators=(',', ': ')) f.close() return def get_address_trans(self, address): received = [] sent = [] changes = [] retxn, setxn = self.get_all_transections(address) # Receiving Transection List for r in retxn: received.append((float(r['load']['coin']), r['txn'])) # Spent Transection list for s in setxn: sent.append((float(s['load']['coin'])+float(s['load']['fee']), s['txn'])) if s['load']['ccoin']: changes.append((float(s['load']['ccoin']), s['txn'])) return (received, sent, changes)
def get_address_balance(self, address): rec, sen, cha = self.get_address_trans(address) r = 0.0 s = 0.0 for amount, txnid in rec: r+= amount for amount, txnid in sen: s+= amount return r-s def double_spend_check(self, address, txn): rcv, snt = self.get_all_transections(address) input_transections = [] for t in snt: k=t['load']['txni'] n = len(k)/64 for i in range(n): tmp = k[i*64: (i+1)*64] if tmp: input_transections.append(tmp) if txn in input_transections: print "[X] Double Spend Found : ", txn return True print "[x] Double Spend Clear : ", input_transections, txn return False
# In[107]:
class PleaseMine: def __init__(self, sbc, auth, transreq = []): self.sbc = sbc self.auth = auth self.drop_fraud_minning_requests(transreq) self.add_award_transection() def drop_fraud_minning_requests(self, transreq): self.transreq = [] for trans in transreq: if trans.category=="mine": pass elif trans.category=='send': self.transreq.append(trans) else: print "[x] Unknown Input Transections : ", transreq return def add_award_transection(self): req = RequestTransection(self.auth) #create_transection req.create_transection(category='mine', coin='25', receiver = self.auth.address) self.reward_txn = req.transection self.transreq.append(req) # assemble all transection and create a block object reqblock = RequestBlock( self.sbc, transbuffer=self.transreq ) # Miner Object mineblock = MineBlock(self.sbc)
# Load Block and find proof of work mineblock.load(reqblock)
# print proof of work #print mineblock.getitems()
# insert block object to blockchain handler self.sbc.new_block_request(mineblock.getblock()) return
# In[108]:
import os import pickle
# In[109]:
class Wallet: def __init__(self, db = 'walletdb.json'): self.dbname = db self.username = None self.password = None self.retreive_wallet() def create_new_user(self, username, password): # Create User Authentication Object u = User() self.db[username+password] = { 'auth': pickle.dumps(u), 'rtxn': [], 'stxn': [], 'bal' : [], } return def check_account(self, username, password): if username+password in self.db.keys(): return True return False def load_account(self, username, password): if self.check_account(username, password): self.auth = pickle.loads(self.db[username+password]['auth']) self.rtxn = self.db[username+password]['rtxn'] self.stxn = self.db[username+password]['stxn'] self.bal = self.db[username+password]['bal'] return def retreive_wallet(self): if os.path.exists(self.dbname): self.db = json.load(open(self.dbname, 'r')) else: self.db = {} return def refresh(self): self.close() self.retreive_wallet() return def close(self): tmp = open(self.dbname, 'w') json.dump(self.db, tmp, sort_keys=True, indent=4, separators=(',', ': ')) tmp.close() return
# In[110]:
if __name__=='__main__': # ----------------------------------------------------------- # ================= Global Object =========================== # ----------------------------------------------------------- # Create Blockchain handler object sbc = SimpleBlockChain()
w = Wallet() w.create_new_user('suraj', 'singh') w.refresh() w.load_account('suraj', 'singh') # ------------------------------------------------------------ # ==================== Miner ================================= # ------------------------------------------------------------
# Create User Authentication Object u = w.auth #= User() print "[*] Miner Address : ", u.address
# [Mining First Block] miner = PleaseMine(sbc, u) print "[*] Miner Reward : ", miner.reward_txn['txn']
# ------------------------------------------------------------ # ==================== Nodes ================================= # ------------------------------------------------------------
node = User() # Example Node print "[*] Node Address : ", node.address # Create Transection Request object n_address = node.address # Shared its receiving address with miners.. because at this time, # miner is the only one account that contain 25 coins
# Miner Requested A Transection req = RequestTransection(u) req.create_transection(category='send', sender=u.address, receiver=n_address, fee='0.1' , coin='20', ccoin = str(25.0-(20.0+0.1)), txni= miner.reward_txn['txn'] ) req1 = RequestTransection(u)
req1.create_transection(category='send', sender=u.address, receiver=n_address, fee='0.1' , coin='20', ccoin = str(25.0-(20.0+0.1)), txni= miner.reward_txn['txn'][::-1] ) transer_money_reference_ = req.transection
print "[+] Changes Left : ", req.ccoin
# Wait... To Add This Block... Miner Again Need To Use its Computational Power... So,,
u1 = User() #PleaseMine(sbc, u1, transreq=[req]) #PleaseMine(sbc, u1, transreq=[req1]) #PleaseMine(sbc, u1, transreq=[req, req1])
sbc.close()
# In[111]:
print sbc.get_address_balance(u.address)
#retxn, setxn = sbc.get_all_transections(node.address)
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