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wallet.py
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wallet.py
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from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
import Crypto.Random
import binascii
from database.access import load_user_from_db, load_node_from_db, save_user_to_db
class Wallet:
def __init__(self, node_id):
self.private_key = None
self.public_key = None
self.node_id = node_id
self.id = None
def create_keys(self):
private_key, public_key = self.generate_keys()
id = save_user_to_db(public_key, private_key, self.node_id)
self.private_key = private_key
self.public_key = public_key
self.id = id
def create_keys_for_users(self):
private_key, public_key = self.generate_keys()
return private_key, public_key
def save_keys(self):
if self.public_key is not None and self.private_key is not None:
try:
with open('wallet-{}.txt'.format(self.node_id), mode='w') as f:
f.write(self.public_key)
f.write('\n')
f.write(self.private_key)
return True
except (IOError, IndexError):
print('Saving wallet failed')
return False
def load_keys(self):
try:
id, public_key, private_key, port = load_node_from_db(self.node_id)
self.id = id
self.public_key = public_key
self.private_key = private_key
return True
except:
return False
def generate_keys(self):
private_key = RSA.generate(1024, Crypto.Random.new().read)
public_key = private_key.publickey()
return (binascii.hexlify(private_key.exportKey(format='DER')).
decode('ascii'), binascii.hexlify(public_key.
exportKey(format='DER')).decode('ascii'))
def sign_transaction(self, sender, recipient, amount):
signer = PKCS1_v1_5.new(RSA.importKey
(binascii.unhexlify(self.private_key)))
h = SHA256.new((str(sender) + str(recipient) +
str(amount)).encode('utf8'))
signature = signer.sign(h)
return binascii.hexlify(signature).decode('ascii')
def sign_transaction_as_seller(self, sender, recipient, amount, id):
private_key = load_user_from_db(sender)[2]
signer = PKCS1_v1_5.new(RSA.importKey
(binascii.unhexlify(private_key)))
h = SHA256.new((str(sender) + str(recipient) +
str(amount)).encode('utf8'))
signature = signer.sign(h)
return binascii.hexlify(signature).decode('ascii')
@staticmethod
def verify_transaction(transaction):
public_key = RSA.importKey(binascii.unhexlify(transaction.sender))
print(f'Verifier Public Key: {public_key}')
verifier = PKCS1_v1_5.new(public_key)
h = SHA256.new((str(transaction.sender) + str(transaction.recipient) +
str(transaction.amount)).encode('utf8'))
return verifier.verify(h, binascii.unhexlify(transaction.signature))