async def sign_tx(ctx, msg): keychain = await seed.get_keychain(ctx) progress.init(msg.transactions_count, "Loading data") try: attested = len(msg.inputs) * [False] input_coins_sum = 0 # request transactions tx_req = CardanoTxRequest() for index in range(msg.transactions_count): progress.advance() tx_ack = await request_transaction(ctx, tx_req, index) tx_hash = hashlib.blake2b(data=bytes(tx_ack.transaction), outlen=32).digest() tx_decoded = cbor.decode(tx_ack.transaction) for i, input in enumerate(msg.inputs): if not attested[i] and input.prev_hash == tx_hash: attested[i] = True outputs = tx_decoded[1] amount = outputs[input.prev_index][1] input_coins_sum += amount if not all(attested): raise wire.ProcessError("No tx data sent for input " + str(attested.index(False))) transaction = Transaction(msg.inputs, msg.outputs, keychain, msg.protocol_magic, input_coins_sum) # clear progress bar display_homescreen() for i in msg.inputs: await validate_path(ctx, validate_full_path, keychain, i.address_n, CURVE) # sign the transaction bundle and prepare the result tx_body, tx_hash = transaction.serialise_tx() tx = CardanoSignedTx(tx_body=tx_body, tx_hash=tx_hash) except ValueError as e: if __debug__: log.exception(__name__, e) raise wire.ProcessError("Signing failed") # display the transaction in UI if not await show_tx( ctx, transaction.output_addresses, transaction.outgoing_coins, transaction.fee, transaction.network_name, transaction.inputs, transaction.outputs, ): raise wire.ActionCancelled("Signing cancelled") return tx
async def sign_tx(ctx, msg): keychain = await seed.get_keychain(ctx) progress.init(msg.transactions_count, "Loading data") try: # request transactions transactions = [] tx_req = CardanoTxRequest() for index in range(msg.transactions_count): progress.advance() tx_ack = await request_transaction(ctx, tx_req, index) transactions.append(tx_ack.transaction) # clear progress bar display_homescreen() for i in msg.inputs: await validate_path(ctx, validate_full_path, path=i.address_n) # sign the transaction bundle and prepare the result transaction = Transaction( msg.inputs, msg.outputs, transactions, keychain, msg.network ) tx_body, tx_hash = transaction.serialise_tx() tx = CardanoSignedTx(tx_body=tx_body, tx_hash=tx_hash) except ValueError as e: if __debug__: log.exception(__name__, e) raise wire.ProcessError("Signing failed") # display the transaction in UI if not await show_tx( ctx, transaction.output_addresses, transaction.outgoing_coins, transaction.change_derivation_paths, transaction.change_coins, transaction.fee, len(tx_body), transaction.network_name, ): raise wire.ActionCancelled("Signing cancelled") return tx