def gen_transaction_prefix(self):
"""
Returns test transaction prefix
:return:
"""
vin = [
TxinToKey(amount=123,
key_offsets=[1, 2, 3, 2**76],
k_image=bytearray(range(32))),
TxinToKey(amount=456,
key_offsets=[9, 8, 7, 6],
k_image=bytearray(range(32, 64))),
TxinGen(height=99),
]
vout = [
TxOut(amount=11, target=TxoutToKey(key=bytearray(range(32)))),
TxOut(amount=34,
target=TxoutToKey(key=bytearray(range(64, 96)))),
]
msg = TransactionPrefix(version=2,
unlock_time=10,
vin=vin,
vout=vout,
extra=list(range(31)))
return msg
def test_txin_to_key(self):
"""
TxinToKey
:return:
"""
msg = TxinToKey(amount=123,
key_offsets=[1, 2, 3, 2**76],
k_image=bytearray(range(32)))
writer = MemoryReaderWriter()
TxinToKey.dump(writer, msg)
test_deser = TxinToKey.load(MemoryReaderWriter(writer.get_buffer()))
self.assertEqual(msg.amount, test_deser.amount)
self.assertEqual(msg, test_deser)
def test_txin_variant(self):
"""
TxInV
:return:
"""
msg1 = TxinToKey(amount=123,
key_offsets=[1, 2, 3, 2**76],
k_image=bytearray(range(32)))
writer = MemoryReaderWriter()
TxInV.dump(writer, msg1)
test_deser = TxInV.load(MemoryReaderWriter(writer.get_buffer()))
self.assertEqual(test_deser.__class__, TxinToKey)
self.assertEqual(msg1, test_deser)
async def set_input(
state: State, src_entr: MoneroTransactionSourceEntry
) -> MoneroTransactionSetInputAck:
from trezor.messages import MoneroTransactionSetInputAck
from apps.monero.xmr.crypto import chacha_poly
from apps.monero.xmr.serialize_messages.tx_prefix import TxinToKey
from apps.monero.signing import offloading_keys
state.current_input_index += 1
await layout.transaction_step(state, state.STEP_INP,
state.current_input_index)
if state.last_step > state.STEP_INP:
raise ValueError("Invalid state transition")
if state.current_input_index >= state.input_count:
raise ValueError("Too many inputs")
# real_output denotes which output in outputs is the real one (ours)
if src_entr.real_output >= len(src_entr.outputs):
raise ValueError(
f"real_output index {src_entr.real_output} bigger than output_keys.size() {len(src_entr.outputs)}"
)
state.summary_inputs_money += src_entr.amount
# Secrets derivation
# the UTXO's one-time address P
out_key = crypto.decodepoint(
src_entr.outputs[src_entr.real_output].key.dest)
# the tx_pub of our UTXO stored inside its transaction
tx_key = crypto.decodepoint(src_entr.real_out_tx_key)
additional_tx_pub_key = _get_additional_public_key(src_entr)
# Calculates `derivation = Ra`, private spend key `x = H(Ra||i) + b` to be able
# to spend the UTXO; and key image `I = x*H(P||i)`
xi, ki, _di = monero.generate_tx_spend_and_key_image_and_derivation(
state.creds,
state.subaddresses,
out_key,
tx_key,
additional_tx_pub_key,
src_entr.real_output_in_tx_index,
state.account_idx,
src_entr.subaddr_minor,
)
state.mem_trace(1, True)
# Construct tx.vin
# If multisig is used then ki in vini should be src_entr.multisig_kLRki.ki
vini = TxinToKey(amount=src_entr.amount, k_image=crypto.encodepoint(ki))
vini.key_offsets = _absolute_output_offsets_to_relative(
[x.idx for x in src_entr.outputs])
if src_entr.rct:
vini.amount = 0
# Serialize `vini` with variant code for TxinToKey (prefix = TxinToKey.VARIANT_CODE).
# The binary `vini_bin` is later sent to step 4 and 9 with its hmac,
# where it is checked and directly used.
vini_bin = serialize.dump_msg(vini, preallocate=64, prefix=b"\x02")
state.mem_trace(2, True)
# HMAC(T_in,i || vin_i)
hmac_vini = offloading_keys.gen_hmac_vini(state.key_hmac, src_entr,
vini_bin,
state.current_input_index)
state.mem_trace(3, True)
# PseudoOuts commitment, alphas stored to state
alpha, pseudo_out = _gen_commitment(state, src_entr.amount)
pseudo_out = crypto.encodepoint(pseudo_out)
# The alpha is encrypted and passed back for storage
pseudo_out_hmac = crypto.compute_hmac(
offloading_keys.hmac_key_txin_comm(state.key_hmac,
state.current_input_index),
pseudo_out,
)
alpha_enc = chacha_poly.encrypt_pack(
offloading_keys.enc_key_txin_alpha(state.key_enc,
state.current_input_index),
crypto.encodeint(alpha),
)
spend_enc = chacha_poly.encrypt_pack(
offloading_keys.enc_key_spend(state.key_enc,
state.current_input_index),
crypto.encodeint(xi),
)
state.last_step = state.STEP_INP
if state.current_input_index + 1 == state.input_count:
# When we finish the inputs processing, we no longer need
# the precomputed subaddresses so we clear them to save memory.
state.subaddresses = None
state.input_last_amount = src_entr.amount
return MoneroTransactionSetInputAck(
vini=vini_bin,
vini_hmac=hmac_vini,
pseudo_out=pseudo_out,
pseudo_out_hmac=pseudo_out_hmac,
pseudo_out_alpha=alpha_enc,
spend_key=spend_enc,
)