def fitxer_100_blocs_valids_fins_XX_DNI():
"""
Un fitxer amb una cadena de 100 blocs que només sigui vàlida fins al bloc XX on XX són les dues darreres
xifres del vostre DNI.
"""
XX_DNI = 81 # ara mateix NO INCLÒS EN ELS VÀLIDS
rsa_0 = blockchain.rsa_key()
size_message = 256
m_0 = random.randint(2**(size_message // 2 - 1),
2**(size_message // 2) - 1)
t_0 = blockchain.transaction(m_0, rsa_0)
cadena_de_blocs = blockchain.block_chain(t_0)
for i in range(1, XX_DNI):
print(i)
rsa = blockchain.rsa_key()
m = random.randint(2**(size_message // 2 - 1),
2**(size_message // 2) - 1)
t = blockchain.transaction(m, rsa)
cadena_de_blocs.add_block(t)
print(cadena_de_blocs.verify())
for i in range(XX_DNI, 100):
print(i)
rsa = blockchain.rsa_key()
m = random.randint(2**(size_message // 2 - 1),
2**(size_message // 2) - 1)
t = blockchain.transaction(m, rsa)
t.signature = random.randint(
0, sys.maxsize
) # fem que sigui invàlida la transacció, també podríem alterar el hash etc
# Nota: en tindríem prou amb alterar-ne un de sol (el 81) perquè els següents també fossin invàlids, es trenca la cadena
cadena_de_blocs.add_block(t)
print(cadena_de_blocs.verify())
fitxer_de_sortida = '81_blocks_valids.block'
with open(fitxer_de_sortida, 'wb') as file:
pickle.dump(cadena_de_blocs, file)
def create_wrong_blockchain_100():
DNI = 19
RSA = rsa_key()
num_blocks = 100
now = time()
transactions = map(
lambda i: transaction(
int(hashlib.sha256(f"Transaction #{i}".encode()).hexdigest(), 16),
RSA), range(100))
blockChain = block_chain(next(transactions))
for _ in range(1, DNI):
blockChain.add_block(next(transactions))
print(f'New block from transaction #{_ + 1} added!')
print(f"Pre-verification: {blockChain.verify()}")
for _ in range(DNI, num_blocks):
print(f'Wrong block from transaction #{_ + 1} added!')
blockChain.add_wrong_block(next(transactions))
with open(f'100_blocks_{DNI}_wrong.pickle', 'wb') as f:
pickle.dump(blockChain, f)
print(f"Verification: {blockChain.verify()}\nTime elapsed: {time() - now}")
def py_to_cpp(obj_to_covert, obj_to_covert_type):
if obj_to_covert_type == "chain":
# Create a vector of blocks
chain_vector = vectorblock()
chain = obj_to_covert
for each_block in chain:
# Create a c++ block struct
block_struct = block()
block_struct.index = each_block['index']
block_struct.prev_hash = each_block['prev_hash']
block_struct.proof = each_block['proof']
block_struct.timestamp = each_block['timestamp']
block_struct.transactions = py_to_cpp(each_block['transactions'],
"transactions")
chain_vector.push_back(block_struct)
return chain_vector
if obj_to_covert_type == "transactions":
# Create a vector of transactions
transaction_vector = vectortransaction()
transactions = obj_to_covert
for each_transaction in transactions:
# Create a c++ transaction struct
transaction_struct = transaction()
transaction_struct.sender = each_transaction['sender']
transaction_struct.recipient = each_transaction['recipient']
transaction_struct.amount = each_transaction['amount']
transaction_vector.push_back(transaction_struct)
return transaction_vector
def fitxer_100_blocs_valids(): """Un fitxer amb una cadena vàlida de 100 blocs""" rsa_0 = blockchain.rsa_key() m_0 = random.randint(0,sys.maxsize) t_0 = blockchain.transaction(m_0,rsa_0) cadena_de_blocs = blockchain.block_chain(t_0) for i in range (1,100): print(i) rsa = blockchain.rsa_key() m = random.randint(0,sys.maxsize) t = blockchain.transaction(m,rsa) cadena_de_blocs.add_block(t) print(cadena_de_blocs.verify()) fitxer_de_sortida = '100_blocks_valids.block' with open(fitxer_de_sortida, 'wb') as file: pickle.dump(cadena_de_blocs, file)