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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
class Wallet:
def __init__(self):
self.private_key = None
self.public_key = None
def create_keys(self):
private_key, public_key = self.generate_keys()
self.private_key = private_key
self.public_key = public_key
def save_keys(self):
if self.public_key != None and self.private_key != None:
try:
with open('wallet_store.txt', mode='w') as f:
f.write(self.public_key)
f.write('\n')
f.write(self.private_key)
return True
except (IOError, IndexError):
return False
else:
return False
def load_keys(self):
try:
with open('wallet_store.txt', mode='r') as f:
keys = f.readlines()
self.public_key = keys[0][:-1]
self.private_key = keys[1]
return True
except (IOError, IndexError):
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_transactions(self, sender, recipient, amount):
"""Returns a cryptographic signature for the transaction using sender's private-key"""
signer = PKCS1_v1_5.new(RSA.importKey(binascii.unhexlify(self.private_key)))
payload_hash = SHA256.new((str(sender) + str(recipient) + str(amount)).encode('utf8'))
signature = signer.sign(payload_hash)
return binascii.hexlify(signature).decode('ascii')
@staticmethod
def verify_transaction_signature(transaction):
public_key = RSA.importKey(binascii.unhexlify(transaction.sender)) # transaction.sender is the public key of the sender
verifier = PKCS1_v1_5.new(public_key)
payload_hash = SHA256.new((str(transaction.sender) + str(transaction.recipient) + str(transaction.amount)).encode('utf8'))
return verifier.verify(payload_hash, binascii.unhexlify(transaction.signature))